Cabletron Systems Switch SEHI 22 User Manual

SEHI-22, SEHI-24, SEHI-32, AND SEHI-34  
10BASE-T INTELLIGENT STACKABLE HUB  
USERS GUIDE  
The Co m p le te Ne two rking So lutio n™  
CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03867-0505  
 
NOTICE  
F CC NOTICE  
This device complies with Part 15 of the FCC rules. Operation is subject to the following  
two conditions: (1) this device may not cause harmful interference, and (2) this device  
must accept any interference received, including interference that may cause undesired  
operation.  
NOTE: This equipment has been tested and found to comply with the limits for a Class  
A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to  
provide reasonable protection against harmful interference when the equipment is  
operated in a commercial environment. This equipment uses, generates, and can radiate  
radio frequency energy and if not installed in accordance with the operators manual,  
may cause harmful interference to radio communications. Operation of this equipment  
in a residential area is likely to cause interference in which case the user will be required  
to correct the interference at his own expense.  
WARNING: Changes or modifications made to this device which are not expressly  
approved by the party responsible for compliance could void the users authority to  
operate the equipment.  
DOC NOTICE  
This digital apparatus does not exceed the Class A limits for radio noise emissions from  
digital apparatus set out in the Radio Interference Regulations of the Canadian  
Department of Communications.  
Le présent appareil numérique német pas de bruits radioélectriques dépassant les  
limites applicables aux appareils numériques de la class A prescrites dans le Règlement  
sur le brouillage radioélectrique édicté par le ministère des Communications du Canada.  
ii  
 
NOTICE  
CABLETRON SYSTEMS, INC.  
P ROGRAM LICENSE AGREEMENT  
IMPORTANT: Before utilizing this product, carefully read this License Agreement.  
This document is an agreement between you, the end user, and Cabletron Systems, Inc.  
(“Cabletron) that sets forth your rights and obligations with respect to the Cabletron  
software program (the Program) contained in this package. The Program may be  
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TERMS OF THIS AGREEMENT, PROMPTLY RETURN THE UNUSED PRODUCT TO  
THE PLACE OF PURCHASE FOR A FULL REFUND.  
CABLETRON SOF TWARE P ROGRAM LICENSE  
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You may not copy, reproduce or transmit any part of the Program except as  
permitted by the Copyright Act of the United States or as authorized in writing by  
Cabletron.  
2. OTHER RESTRICTIONS. You may not reverse engineer, decompile, or  
disassemble the Program.  
3. APPLICABLE LAW. This License Agreement shall be interpreted and governed  
under the laws and in the state and federal courts of New Hampshire. You accept  
the personal jurisdiction and venue of the New Hampshire courts.  
iii  
 
NOTICE  
EXCLUSION OF WARRANTY  
AND DISCLAIMER OF LIABILITY  
1. EXCLUSION OF WARRANTY. Except as may be specifically provided by  
Cabletron in writing, Cabletron makes no warranty, expressed or implied,  
concerning the Program (including Its documentation and media).  
CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE  
SUPPLIED TO YOU BY CABLETRON IN WRITING, EITHER EXPRESS OR  
IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF  
MERCHANTABLITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH  
RESPECT TO THE PROGRAM, THE ACCOMPANYING WRITTEN MATERIALS,  
AND ANY ACCOMPANYING HARDWARE.  
2. NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL  
CABLETRON OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES  
WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS  
OF BUSINESS, PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS  
INFORMATION, SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR RELIANCE  
DAMAGES, OR OTHER LOSS) ARISING OUT OF THE USE OR INABILITY TO  
USE THIS CABLETRON PRODUCT, EVEN IF CABLETRON HAS BEEN  
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. BECAUSE SOME  
STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY  
FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR ON THE DURATION  
OR LIMITATION OF IMPLIED WARRANTEES IN SOME INSTANCES THE  
ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.  
UNITED STATES GOVERNMENT  
RESTRICTED RIGHTS  
The enclosed product (a) was developed solely at private expense; (b) contains restricted  
computer software” submitted with restricted rights in accordance with Section 52227-  
19 (a) through (d) of the Commercial Computer Software - Restricted Rights Clause and  
its successors, and (c) in all respects is proprietary data belonging to Cabletron and/or its  
suppliers.  
For Department of Defense units, the product is licensed with Restricted Rights” as  
defined in the DoD Supplement to the Federal Acquisition Regulations, Section 52.227-  
7013 (c) (1) (ii) and its successors, and use, duplication, disclosure by the Government is  
subject to restrictions as set forth in subparagraph (c) (1) (ii) of the Rights in Technical  
Data and Computer Software clause at 252.227-7013. Cabletron Systems, Inc., 35  
Industrial Way. Rochester, New Hampshire 03867  
iv  
 
CONTENTS  
TABLE OF CONTENTS  
AP P ENDIX A TABLE OF CONTENTS v  
CHAP TER 1 INTRODUCTION  
1.1 USING THIS MANUAL ............................................................ 1-1  
1.2 GETTING HELP ........................................................................ 1-2  
1.3 SEHI OVERVIEW ..................................................................... 1-2  
1.4 SEHI FEATURES ...................................................................... 1-3  
1.5 STACKABLE CAPABILITIES .................................................. 1-4  
1.6 REMOTE NETWORK MANAGEMENT CAPABILITIES ...... 1-4  
1.7 OPTIONAL FEATURES ........................................................... 1-5  
1.8 RELATED MANUALS .............................................................. 1-6  
CHAP TER 2 INSTALLATION  
REQUIREMENTS/SP ECIF ICATIONS  
2.1 CABLE SPECIFICATIONS....................................................... 2-1  
2.1.1 HubSTACK Interconnect Cable Requirements ........... 2-1  
2.1.2 UTP and STP Cable Specifications for the Network Ports  
and EPIM-T Module...................................................... 2-2  
2.1.3 Multimode Fiber Optic Cable Specifications for the  
EPIM-F1 and EPIM-F2 Modules ................................. 2-4  
2.1.4 Single Mode Fiber Optic Cable Specifications for  
the EPIM-F3 Module .................................................... 2-5  
2.1.5 Thin-Net Network Requirements for the EPIM-C Mod-  
ule  
2-6  
2.1.6 AUI Cable Requirements for the EPIM-A  
and EPIM-X Modules.................................................... 2-7  
2.2 NETWORK PORT SPECIFICATIONS .................................... 2-7  
2.2.1 SEHI-22 and SEHI-24 Network Port Specifications... 2-8  
2.2.2 SEHI-32 and SEHI-34 Network Port Specifications... 2-8  
2.3 EPIM SPECIFICATIONS ....................................................... 2-10  
2.3.1 EPIM-T ........................................................................ 2-10  
2.3.2 EP IM-F 1 a n d EP IM-F 2 .............................................2-11  
2.3.3 EPIM-F3 ...................................................................... 2-12  
2.3.4 EPIM-C ........................................................................ 2-14  
2.3.5 EPIM-A and EPIM-X (AUI Port)................................ 2-15  
2.4 COM PORT REQUIREMENTS .............................................. 2-16  
2.5 TRANSCEIVER REQUIREMENTS ....................................... 2-16  
v
 
CONTENTS  
2.6 OPERATING SPECIFICATIONS ...........................................2-17  
CHAP TER 3 INSTALLATION  
3.1 UNPACKING THE SEHI ..........................................................3-1  
3.2 INSTALLING THE SEHI ..........................................................3-1  
3.2.1 Stacking the SEHI.........................................................3-2  
3.2.2 Attaching the Strain Relief Bracket .............................3-4  
3.2.3 Rack Mounting the SEHI ..............................................3-5  
3.2.4 Wall Mounting the SEHI ..............................................3-6  
3.2.5 Free-Standing Installation............................................3-7  
3.3 CONNECTING THE SEHI TO THE POWER SOURCE .........3-8  
CHAP TER 4 CONNECTING TO THE NETWORK  
4.1 CONNECTING THE SEHI TO THE NETWORK....................4-1  
4.1.1 Connecting to Network Ports, SEHI-22 and SEHI-24 4-1  
4.1.2 Connecting to Network Ports, SEHI-32 and SEHI-34 4-3  
4.1.3 Connecting a UTP Segment to an EPIM-T ..................4-4  
4.1.4 Connecting a Fiber Optic Link Segment to an EPIM-F1,  
EPIM-F2, or EPIM-F34-5  
4.1.5 Connecting a Thin-Net Segment to an EPIM-C ..........4-8  
4.1.6 Connecting an AUI Cable to an EPIM-A ...................4-10  
4.1.7 Connecting an AUI Cable to an EPIM-X....................4-11  
4.2 FINISHING THE INSTALLATION........................................4-12  
CHAP TER 5 TROUBLESHOOTING  
5.1 INSTALLATION CHECK-OUT ................................................5-1  
5.2 USING LANVIEW......................................................................5-2  
5.3 USING THE RESET BUTTON .................................................5-4  
CHAP TER 6 LOCAL MANAGEMENT  
6.1 MANAGEMENT TERMINAL REQUIREMENTS ...................6-2  
6.1.1 Console Cable Configuration ........................................6-3  
6.1.2 Management Terminal Setup Parameters...................6-4  
6.2 ACCESSING LOCAL MANAGEMENT ....................................6-5  
6.3 USING THE LOCAL MANAGEMENT SCREENS..................6-7  
6.3.1 The Community Name Table Screen............................6-7  
6.3.2 The Configuration Screen ...........................................6-10  
6.3.3 The Trap Table Screen ................................................6-14  
6.3.4 The SNMP Tools Screen ..............................................6-16  
6.3.5 The Device Statistics Screen .......................................6-22  
vi  
 
CONTENTS  
AP P ENDIX B TWISTED P AIR WIRING TABLES A-1  
vii  
 
INTRODUCTION  
CHAP TER 1  
INTRODUCTION  
Welcome to the Cabletron Systems SEHI-22, SEHI-24, SEHI-32,  
a n d SEHI-34 10BASE-T In telligen t Sta ck a ble Hu b User s  
Gu id e. This manual explains installation instructions and provides  
reference information for the SEHI-22, 24, 32, and 34.  
Note: The term SEHI (Stackable Ethernet Hub with Intelligence) is  
used throughout this manual when describing features and functions  
that are common to the SEHI-22, 24, 32, and 34.  
1.1 USING THIS MANUAL  
Read through this manual to gain an understanding of the features  
and capabilities of the SEHI. A general knowledge of Ethernet and  
IEEE 802.3 type data communications networks and their physical  
layer components will be helpful when installing the SEHI.  
Chapter 1, In tr od u ction , outlines the contents of this manual, briefly  
describes SEHI features, and concludes with a list of related manuals.  
Chapter 2, In sta lla tion Requ ir em en ts/Sp ecifica tion s, describes  
installation requirements, network guidelines, and SEHI operating  
specifications.  
Chapter 3, In sta lla tion , contains instructions for installing your  
SEHI as a stackable or stand-alone hub.  
Chapter 4, Con n ectin g to th e Netw or k , explains how to connect the  
SEHI to the network using the various media types.  
Chapter 5, Tr ou blesh ootin g, describes how to use the LANVIEW  
LEDs to troubleshoot network problems.  
Chapter 6, Loca l Ma n a gem en t, describes how to use SEHI Local  
Management screens and the available commands.  
Appendix A, Tw isted Pa ir Wir in g Ta bles, lists Punch Down Block  
pinouts.  
Page 1-1  
 
INTRODUCTION  
1.2 GETTING HELP  
If you need additional support related to the Cabletron Systems SEHI,  
or if you have any questions, comments, or suggestions concerning this  
manual, contact Cabletron Systems Technical Support:  
By phone .................. (603) 332-9400  
Monday-Friday; 8am - 8pm EST  
®
By CompuServe ..... GO CTRON from any ! prompt  
By Internet mail ...... support@ctron.com  
By FTP ..................... ctron.com (134.141.197.25)  
Login: anonymous, Password: your email address  
1.3 SEHI OVERVIEW  
The 10BASE-T SEHI is an intelligent repeating hub that provides  
front panel ports for network connections and a rear panel  
HubSTACK Interconnect Bus port for stackable connections. The  
SEHI is designed to manage Cabletron Systems’ SEH series of  
non-intelligent stackable hubs.  
EPIM-2  
HubSTACK 10BASE-T HUB WITH LANVIEW®  
SEHI-24  
RCV  
LNK  
E
2
24 23 22 21 20 19 18 17 16 15 14 13  
24X 23X 22X 21X 20X 19X  
18X 17X 16X 15X 14X 13X  
PWR  
CPU  
CLN  
RCV  
LNK  
12 11 10  
E
1
9
8
7
6
5
4
3
2
1
RESET  
6X  
5X  
4X  
3X  
2X  
1X  
12X 11X 10X  
9X  
8X  
7X  
COM  
EPIM-1  
SEHI-24 10BASE-T HUB WITH LANVIEW®  
SEH INTERCONNECT  
OUT  
EPIM-2  
HubSTACK 10BASE-T HUB WITH LANVIEW®  
SEHI-34  
RCV  
LNK  
E
2
24 23 22 21 20 19 18 17 16 15 14 13  
24X  
13X  
PWR  
CPU  
CLN  
RCV  
LNK  
12 11 10  
E
1
9
8
7
6
5
4
3
2
1
RESET  
12X  
1X  
COM  
EPIM-1  
SEHI-34 10BASE-T HUB WITH LANVIEW®  
SEH INTERCONNECT  
OUT  
Figure 1-1. The SEHI-24 and SEHI-34  
Page 1-2  
 
INTRODUCTION  
The SEHI-22/24 and SEHI-32/34 are functionally identical with the  
exception of the network ports:  
SEHI-22, 12 RJ 45 network ports and one EPIM port.  
SEHI-24, 24 RJ 45 network ports and two EPIM ports.  
SEHI-32, one 50 pin Champ connector, providing 12 twisted  
pair segments, and one EPIM port.  
SEHI-34, two 50 pin Champ connectors, providing 24 twisted  
pair segments, and two EPIM ports.  
1.4 SEHI F EATURES  
Rep ea ter F u n ction a lity  
The SEHI fully conforms to the IEEE 802.3 Repeater, AUI, and  
10BASE-T specifications, and provides the flexibility to connect  
networks using IEEE 802.3, Ethernet Version 1 or Version 2  
equipment. The SEHI transmits re-timed data packets, regenerates  
the preamble, extends fragments, and arbitrates collisions.  
The SEHI automatically partitions problem segments, and reconnects  
repaired segments to the network. This feature minimizes the impact  
on network operation resulting from a problem on one segment by  
isolating the problem segment. Only devices on the problem segment  
are affected. When the problem is solved, the SEHI automatically  
reconnects the isolated segment to the network.  
P ola r ity Detection a n d Cor r ection  
Each twisted pair port on the SEHI incorporates a Polarity Detection  
and Correction feature that allows the SEHI to pass data regardless of  
the polarity of the twisted pair segments receive link. We do not  
recommend operating in this condition. If you discover this condition,  
remove the segment from the network and wire it correctly. This  
reduces the potential for problems if equipment changes are made.  
F la sh EEP ROMs  
The SEHI uses Flash EEPROMs that allow you to download new and  
updated firmware using Cabletrons Remote LANVIEW/Windows,  
version 2.3 or later or any device using BOOTP or TFTP protocols.  
Page 1-3  
 
INTRODUCTION  
LANVIEW LEDs  
Cabletron Systems’ LANVIEW Status Monitoring and Diagnostics  
System is a troubleshooting tool that helps you diagnose power  
failures, collisions, cable faults, and link problems. The LANVIEW  
LEDs are conveniently located on the SEHIs front panel.  
Reset Bu tton  
The front panel Reset Button lets you reboot the SEHI and initialize  
the processor.  
Loca l Ma n a gem en t  
The SEHIs Local Management lets you manage the SEHI and all its  
attached segments. It also provides full packet and error statistics for  
the entire stack, individual device, or individual port. You access Local  
Management by attaching a DEC VT™ 320 terminal or a PC using  
VT320 emulation software to the SEHIs RJ 45 COM port.  
1.5 STACKABLE CAP ABILITIES  
The SEHI intelligent hub is designed to manage Cabletrons SEH  
series of non-intelligent hubs. The SEHI serves as the logical top” of  
the stack. It manages all SEH hubs in the stack providing full packet  
and error statistics for the entire stack, individual device, or  
individual port.  
You can stack together up to four SEH non-intelligent hubs with one  
SEHI using Cabletrons external HubSTACK Interconnect cables.  
Stackable configurations let you maintain only one IEEE repeater hop  
while providing up to 130 Ethernet ports. You can also add or remove  
hubs from the stack without having to power down.  
1.6 REMOTE NETWORK MANAGEMENT CAP ABILITIES  
You can manage the SEHI remotely by any SNMP network  
management system. Cabletron Systems offers the following remote  
management packages:  
®
Cabletron Systems SPECTRUM  
®
Cabletron Systems Remote LANVIEW /Windows™  
Cabletron Systems Remote LANVIEW for SunNet™ Manager  
®
Page 1-4  
 
INTRODUCTION  
1.7 OP TIONAL F EATURES  
The following features are not included with the SEHI but can be  
purchased separately from Cabletron Systems.  
Eth er n et P or t In ter fa ce Mod u les (EP IMs)  
EPIMs let you expand your network through a variety of media.  
Cabletron Systems offers the EPIMs shown in Table 1-1.  
Table 1-1. EPIMs  
EP IM  
Med ia Typ e  
Con n ector  
EPIM-A  
EPIM-C  
EPIM-T  
AUI  
DB15 (Female)  
BNC  
10BASE-2 Thin Coaxial  
10BASE-T Unshielded  
Twisted Pair  
RJ 45  
EPIM-X  
EPIM-F1  
EPIM-F2  
EPIM-F3  
Standard Transceiver  
Multimode Fiber  
Multimode Fiber  
Single Mode Fiber  
DB15 (Male)  
SMA  
ST  
ST  
Hu bSTACK In ter con n ect Ca bles  
You need Cabletrons HubSTACK Interconnect cables to stack hubs  
together. Table 1-2 lists the part number and application for each  
cable.  
Table 1-2. HubSTACK Interconnect Cables  
Pa r t  
Descr ip tion  
Ap p lica tion  
Nu m ber  
9380110  
9380111  
12" HubSTACK  
Interconnect Cable  
SEH to SEH connections.  
SEHI to SEH connections.  
18" HubSTACK  
Interconnect Cable  
Page 1-5  
 
INTRODUCTION  
Da u gh ter Boa r d Up gr a d e Kit  
You can upgrade the SEHI-22 and the SEHI-32 to 24 ports using the  
daughter board upgrade kit. The Cabletron part numbers for the  
upgrades are:  
SEHI-22:  
SEHI-32:  
24PORT-UGKT-E  
24PORT-UGKT-E 50P  
Ra ck Mou n t or Wa ll Mou n t Ha r d w a r e  
You can install your SEHI in a 19-inch rack or mount it on a wall.  
Cabletron offers an accessory package that includes brackets and  
mounting screws. The part number for the accessory package is  
SEHI-ACCY-KIT.  
1.8 RELATED MANUALS  
Use the Cabletron Systems SEH-22/24 a n d SEH-32/34 User s  
Gu id e to supplement the procedures and other technical data  
provided in this manual. The procedures contained in the SEH-22/24  
a n d SEH-32/34 User s Gu id e are referenced where appropriate, but  
not repeated in this manual.  
Page 1-6  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
CHAP TER 2  
INSTALLATION  
REQUIREMENTS/SP ECIF ICATIONS  
This Chapter describes cabling requirements, network guidelines, and  
operating specifications for the SEHI. Be sure to read this chapter  
before you install the SEHI. Your network must meet the  
requirements and conditions specified in this chapter to obtain  
satisfactory performance from this equipment. Failure to follow these  
guidelines could result in poor network performance.  
2.1 CABLE SP ECIF ICATIONS  
The SEHI network ports support both Shielded Twisted Pair (STP) or  
Unshielded Twisted Pair (UTP) cabling. The Ethernet Port Interface  
Modules (EPIMs) let you expand your network using UTP, STP,  
Multimode Fiber Optic, Single Mode Fiber Optic, or Thin Coaxial  
cabling. The rear panel Interconnect Bus port supports Cabletron  
Systems’ HubSTACK Interconnect cables for stackable applications.  
Take care in planning and preparing the cabling and connections for  
your network. The quality of the connections and the length of cables  
are critical factors in determining the reliability of your network. The  
following sections describe specifications for each media type.  
2.1.1 Hu bSTACK In ter con n ect Ca ble Requ ir em en ts  
You stack the SEHI to modules in the stack with the SEHI  
HubSTACK Interconnect cable available only from Cabletron  
Systems. Refer to Chapter 1 for cable part numbers.The cable attaches  
to the SEHIs rear panel bus port.  
The rear panel of the SEHI has an Interconnect Bus Out port (male  
connector) to stack SEH non-intelligent hubs together. You can stack  
as many as four SEHs together with one SEHI.  
Page 2-1  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.1.2 UTP a n d STP Ca ble Sp ecifica tion s for th e Netw or k Por ts  
a n d EP IM-T Mod u le  
The device at the other end of the twisted pair segment must meet  
IEEE 802.3 10BASE-T specifications. When you connect a 10BASE-T  
Twisted Pair Segment to the SEHIs 10BASE-T Twisted Pair Network  
Ports and EPIM-T module, your network must meet the following  
requirements:  
Len gth  
The IEEE 802.3 10BASE-T standard requires that 10BASE-T devices  
transmit over a 100 meter (328 foot) link using 22-24 AWG unshielded  
twisted pair wire. However, cable quality largely determines  
maximum link length. If you use high quality, low attenuation cable,  
you can achieve link lengths of up to 200 meters. Cable delay limits  
maximum link length to 200 meters, regardless of the cable type.  
In ser tion Loss  
The maximum insertion loss allowed for a 10BASE-T link is 11.5 dB  
at all frequencies between 5.0 and 10 MHz. This includes the  
attenuation of the cables, connectors, patch panels, and reflection  
losses due to impedance mismatches in the link segment.  
Im p ed a n ce  
Cabletron Systems 10BASE-T Twisted Pair products will work on  
twisted pair cable with 75 to 165 ohms impedance. Unshielded twisted  
pair cables typically have an impedance of between 85 to 110 ohms.  
Shielded twisted pair cables, such as IBM Type 1 cable, can also be  
used. You should remember that the impedance of IBM Type 1 cable is  
typically 150 ohms. This increases the signal reflection caused by the  
cable, but since the cable is shielded, this signal reflection has little  
effect on the received signals quality due to the lack of crosstalk  
between the shielded cable pairs.  
J itter  
Intersymbol interference and reflections can cause jitter in the bit cell  
timing, resulting in data errors. A 10BASE-T link must not generate  
more than 5.0 nsec. of jitter. If your cable meets the impedance  
requirements for a 10BASE-T link, jitter should not be a concern.  
Page 2-2  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
Dela y  
The maximum propagation delay of a 10BASE-T link segment must  
not exceed 1000 nsec. This 1000 nsec. maximum delay limits the  
maximum link segment length to no greater than 200 meters.  
Cr ossta lk  
Crosstalk is caused by signal coupling between the different cable  
pairs contained within a multi-pair cable bundle. 10BASE-T  
transceivers are designed so that the user does not need to be  
concerned about cable crosstalk, provided the cable meets all other  
requirements.  
Noise  
Noise can be caused by either crosstalk or externally induced  
impulses. Impulse noise may cause data errors if the impulses occur at  
very specific times during data transmission. Generally, the user need  
not be concerned about noise. If noise-related data errors are  
suspected, it may be necessary to either reroute the cable or eliminate  
the source of the impulse noise.  
Tem p er a tu r e  
Multi-pair PVC 24 AWG telephone cables typically have an  
attenuation of approximately 8 to 10 dB/100m at 20° C (78° F). The  
attenuation of PVC insulated cable varies significantly with  
temperature. At temperatures greater than 40° C (104° F), we  
strongly recommend that you use plenum-rated cables to ensure that  
cable attenuation remains within specification.  
Page 2-3  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.1.3 Mu ltim od e Fiber Op tic Ca ble Sp ecifica tion s for th e  
EP IM-F 1 a n d EP IM-F 2 Mod u les  
Table 2-1 shows Multimode Fiber Optic Cable specifications for the  
EPIM-F1 and EPIM-F2 modules.  
Table 2-1. Multimode Fiber Optic Cable Specifications  
Ca ble Typ e  
Atten u a tion  
Ma xim u m Ca ble Len gth  
50/125 µm  
62.5/125 µm  
100/140 µm  
13.0 dB or less  
16.0 dB or less  
19.0 dB or less  
The maximum allowable fiber  
optic cable length is 2 km  
(2187.2 yards). However,  
IEEE 802.3 specifications  
allow for a maximum of 1 km  
(1093.6 yards).  
Atten u a tion  
You must test the fiber optic cable with a fiber optic attenuation test  
set adjusted for an 850 nm wavelength. This test verifies that the  
signal loss in a cable is within an acceptable level. Table 2-1 shows the  
attenuation for each Multimode cable type.  
F iber Op tic Bu d get a n d P r op a ga tion Dela y  
When determining the maximum fiber optic cable length, the fiber  
optic budget delay and total network propagation should be calculated  
and taken into consideration before fiber optic cable runs are  
incorporated in any network design.  
Fiber optic budget is the combination of the optical loss due to the  
fiber optic cable, in-line splices, and fiber optic connectors.  
Propagation delay is the amount of time it takes data to travel from  
the sending device to the receiving device. Total propagation delay  
allowed for the entire network is 25.6 µsec, if the total propagation  
delay between any two nodes on the network exceeds 25.6 µsec, then  
bridges should be used.  
Page 2-4  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.1.4 Sin gle Mod e Fiber Op tic Ca ble Sp ecifica tion s for  
th e EP IM-F 3 Mod u le  
Table 2-2 shows Single Mode Fiber Optic Cable specifications for the  
EPIM-F3.  
Table 2-2. Single Mode Fiber Optic Cable Specifications  
Ca ble Typ e  
Atten u a tion  
Ma xim u m Ca ble Len gth  
8/125-12/125 µm 10.0 dB or less The maximum allowable fiber  
optic cable length is  
5 km (3.1 miles) with bridges  
at each segment end. Howev-  
er, IEEE 802.3 FOIRL specifi-  
cations specify a maximum of  
1 km (1093.6 yards).  
Atten u a tion  
You must test the fiber optic cable with a fiber optic attenuation test  
set adjusted for an 1300 nm wavelength. This test verifies that the  
signal loss in a cable is 10.0 dB or less for any given single mode fiber  
optic link.  
F iber Op tic Bu d get a n d P r op a ga tion Dela y  
Fiber optic budget is the combination of the optical loss due to the  
fiber optic cable, in-line splices, and fiber optic connectors. When  
determining the maximum fiber optic cable length, the fiber optic  
budget (total loss of 10.0 dB or less between stations) and total  
network propagation delay should be calculated and considered before  
fiber optic cable runs are incorporated in any network design.  
Propagation delay is the amount of time it takes data to travel from  
the sending device to the receiving device. Total propagation delay  
allowed for the entire network is 25.6 µsec, if the total propagation  
delay between any two nodes on the network exceeds 25.6 µsec, then  
bridges should be used.  
Page 2-5  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.1.5 Th in -Net Netw or k Requ ir em en ts for th e EP IM-C Mod u le  
When you connect a thin-net segment to the SEHI (via an EPIM-C),  
your network must meet the following requirements:  
Ca ble Typ e  
50 ohm RG-58A/U type coaxial cable must be used when making up a  
thin-net cable segment.  
Len gth  
The thin-net segment must be no longer than 185 meters.  
Ter m in a tor s  
A 50 ohm terminator must be connected to the far end of each  
thin-net segment.  
Con n ector s  
A maximum of 29 tee-connectors may be used throughout the length  
of cable segment for host connections. If an excessive number of barrel  
connectors are used within the cable segment, such as finished wall  
plates with BNC feed-throughs, then a reduced number of host  
connections may be required. For special network design, contact  
Cabletron Systems Technical Support.  
Gr ou n d in g  
For safety, ground only on e end of a thin-net segment. Do NOT  
connect EPIM BNC ports to earth ground.  
Wa r n in g: Connecting a thin-net segment to earth ground at more than  
one point could produce dangerous ground currents.  
Page 2-6  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.1.6 AUI Ca ble Requ ir em en ts for th e EP IM-A  
a n d EP IM-X Mod u les  
When you connect an external network segment to the SEHI (via an  
EPIM-A or EPIM-X), the AUI cable must meet the following  
requirements:  
AUI Ca ble  
The AUI cable connecting the module to a device must be IEEE 802.3  
type cable.  
Len gth  
The AUI Cable must not exceed 50 meters in length. If 28 AWG thin  
office drop AUI cable is used, then the maximum cable length is  
limited to 50 feet (15.24 meters).  
Gr ou n d in g  
The connector shell of the EPIM-A and the EPIM-X are connected to  
ground.  
2.2 NETWORK P ORT SP ECIF ICATIONS  
The SEHI-22 and SEHI-24 network ports are shielded RJ 45  
connectors that support both STP and UTP cabling. The SEHI-32 and  
SEHI-34 provide a 50 pin Champ style connector for network  
connections. The following sections provide specifications for each  
SEHI model.  
Page 2-7  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.2.1 SEHI-22 a n d SEHI-24 Netw or k Por t Sp ecifica tion s  
The SEHI-22 and SEHI-24 provide RJ 45 connections for network  
connections. Figure 2-1 shows the RJ 45 pinouts.  
1 2 3 4 5 6 7 8  
10X  
12X  
11X  
1. Receive +  
2. Receive -  
3. Transmit +  
4. Not Used  
5. Not Used  
6. Transmit -  
7. Not Used  
8. Not Used  
Figure 2-1. RJ 45 Network Ports  
2.2.2 SEHI-32 a n d SEHI-34 Netw or k Por t Sp ecifica tion s  
The SEHI-32 and SEHI-34 provide 50 pin Champ connectors for  
network connections as shown in Figure 2-2. Table 2-3 shows the  
pinouts for the Champ connector.  
24X  
12X  
13X  
1X  
Figure 2-2. SEHI-34 Network Ports  
Page 2-8  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
Table 2-3. Champ Connector Pinouts  
50 P in Ch a m p Con n ector  
Pin  
Signal Wire Color  
Pin Signal  
Wire Color  
1
RX 1-  
TX 1-  
RX 2-  
TX 2-  
RX 3-  
TX 3-  
RX 4-  
TX 4-  
RX 5-  
TX 5-  
RX 6-  
TX 6-  
RX 7-  
TX 7-  
RX 8-  
TX 8-  
RX 9-  
TX 9-  
Blue/White  
Orange/White  
Green/White  
Brown/White  
Gray/White  
Blue/Red  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
RX 1+  
TX 1+  
RX 2+  
TX 2+  
RX 3+  
TX 3+  
RX 4+  
TX 4+  
RX 5+  
TX 5+  
RX 6+  
TX 6+  
RX 7+  
TX 7+  
RX 8+  
TX 8+  
RX 9+  
TX 9+  
RX 10+  
TX 10+  
RX 11+  
TX 11+  
RX 12+  
TX 12+  
N/C  
White/Blue  
White/Orange  
White/Green  
White/Brown  
White/Gray  
Red/Blue  
2
3
4
5
6
7
Orange/Red  
Green/Red  
Red/Orange  
Red/Green  
8
9
Brown/Red  
Gray/Red  
Red/Brown  
Red/Gray  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
Blue/Black  
Black/Blue  
Black/Orange  
Black/Green  
Black/Brown  
Black/Gray  
Yellow/Blue  
Yellow/Orange  
Yellow/Green  
Yellow/Brown  
Yellow/Gray  
Violet/Blue  
Violet/Orange  
Violet/Green  
Brown  
Orange/Black  
Green/Black  
Brown/Black  
Gray/Black  
Blue/Yellow  
Orange/Yellow  
Green/Yellow  
RX 10- Brown/Yellow  
TX 10- Gray/Yellow  
RX 11- Blue/Violet  
TX 11- Orange/Violet  
RX 12- Green/Violet  
TX 12- Brown/Violet  
N/C  
Gray/Violet  
Violet/Gray  
Page 2-9  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.3 EP IM SP ECIF ICATIONS  
EPIMs let you connect the SEHI to the main network using different  
media types. Cabletron Systems offers a variety of EPIMs. The  
following sections explain specifications for each EPIM.  
2.3.1 EP IM-T  
The EPIM-T is an RJ 45 connector supporting UTP cabling. It has an  
internal Cabletron Systems TPT-T™ 10BASE-T Twisted Pair  
Transceiver.  
The slide switch on the EPIM-T determines the cross-over status of  
the cable pairs. If the switch is on the X side, the pairs are internally  
crossed over. If the switch is on the = side, the pairs are not internally  
crossed over. Figure 2-3 shows the pinouts for the EPIM-T in both  
cross-over positions.  
Position X  
(crossed over)  
1. RX+  
2. RX-  
3. TX+  
4. NC  
5. NC  
6. TX-  
7. NC  
8. NC  
Position =  
(not crossed over)  
1. TX+  
2. TX-  
3. RX+  
4. NC  
5. NC  
6. RX-  
7. NC  
8. NC  
Figure 2-3. EPIM-T Pinouts  
Page 2-10  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.3.2 EP IM-F 1 a n d EP IM-F 2  
The EPIM-F1 and EPIM-F2 shown in Figure 2-4 support Multimode  
Fiber Optic cabling. Each EPIM has an internal Cabletron Systems  
FOT-F™ Fiber Optic Transceiver. The EPIM-F1 is equipped with  
SMA Connectors and the EPIM-F2 is equipped with ST Connectors.  
Specifications for the EPIMs are listed below.  
Figure 2-4. EPIM-F1 and EPIM-F2  
P a r a m eter  
Typ ica l  
Va lu e  
Wor st  
Ca se  
Wor st Ca se Typ ica l  
Bu d get  
Bu d get  
Receive  
Sensitivity:  
Peak Input  
Power:  
-30.5 dBm -28.0 dBm  
-7.6 dBm -8.2 dBm  
Transmitter Power  
50/125 µm  
fiber:  
-13.0 dBm -15.0 dBm 13.0 dB  
-10.0 dBm -12.0 dBm 16.0 dB  
-7.0 dBm -9.0 dBm 19.0 dB  
17.5 dB  
20.5 dB  
23.5 dB  
62.5/125 µm  
fiber:  
100/140 µm  
fiber:  
-10  
Error Rate:  
Better than 10  
Note: The transmitter power levels and receive sensitivity levels  
listed are Peak Power Levels after optical overshoot. A Peak Power  
Meter must be used to correctly compare the values given above to  
those measured on any particular port. If Power Levels are being  
measured with an Average Power Meter, then 3 dBm must be added  
to the measurement to correctly compare those measured values to  
the values listed (i.e. -30.5 dBm peak=-33.5 dBm average).  
Page 2-11  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.3.3 EP IM-F 3  
The EPIM-F3 shown in Figure 2-5 supports Single Mode Fiber Optic  
cabling. It has an internal Cabletron Systems FOT-F™ Fiber Optic  
Transceiver and is equipped with ST Connectors. Specifications for  
the EPIM-F3 are listed below.  
Figure 2-5. EPIM-F3  
Note: Transmitter Power decreases as temperatures rise and  
increases as temperatures fall. Use the Output Power Coefficient to  
calculate increased or decreased power output for your operating  
environment. For example, the typical power output at 25° C is -16.4  
dBm. For a 4° C temperature increase, multiply the typical  
coefficient (-0.15 dBm) by four and add the result to typical output  
power (4 x -0.15 dBm + -16.4 = -17.0).  
Page 2-12  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
Maximum Sensitivity (-36.0)  
Receive  
Sensitivity  
Typical Sensitivity (-31.0)  
Minimum Sensitivity (-30.0)  
Minimum Receive Input (-9.72)  
Typical Receive Input (-7.5)  
Maximum  
Receive  
Input Power  
Maximum Receive Input (-6.99)  
Maximum Transmit Power (-12.0)  
Typical Transmit Power (-15.5)  
Transmitter Power*  
(At 25°C into  
8.3/125µm fiber)  
Minimum Transmit Power (-21.0)  
-40  
-35  
-30  
-25  
-20  
-15  
-10  
-5  
0
dBm  
Less Power  
More Power  
* Transmit Power  
Typical Power  
Minimum Power  
Maximum Power  
Coefficient  
(See Note Below)  
-0.15dBm/°C  
-0.12 dBm/°C  
-0.18 dBm/°C  
P a r a m eter  
Typ ica l  
Min im u m  
Ma xim u m  
Transmitter Peak  
Wave Length  
1300 nm  
60 nm  
1270 nm  
-
1330 nm  
100 nm  
Spectral Width  
Rise Time/  
Fall Time  
3.0 nsec  
2.5 nsec  
2.7 nsec  
2.2 nsec  
5.0 nsec  
5.0 nsec  
Duty Cycle  
50.1%  
49.6%  
50.7%  
Bit Error Rate:  
Better than 10-10  
Note: The transmitter power levels given above are Peak Power  
Levels after optical overshoot. You must use a Peak Power Meter to  
correctly compare the values given above to those measured on any  
particular port. If you are measuring power levels with an Average  
Power Meter, add 3 dBm to the average power measurement to  
correctly compare the average power values measured to the values  
listed above (i.e. -33.5 dBm average + 3 dB = -30.5 dBm peak).  
Page 2-13  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.3.4 EP IM-C  
The EPIM-C supports thin-net coaxial cabling and is equipped with an  
internal Cabletron Systems TMS-3™ Transceiver. You can use the  
TERM switch on the front of the EPIM-C to set the internal 50 Ohm  
terminator. This eliminates the need to connect the port to a  
tee-connector and terminator. Figure 2-6 shows the setting for the  
terminator switch.  
Internal Termination Switch  
= On (internally terminated)  
= Off (need external termination)  
Figure 2-6. EPIM-C  
Con n ector Typ e  
BNC receptacle, with gold center contact, for use with BNC type tee-  
connectors and RG-58 thin-net cable.  
Gr ou n d in g  
For safety, only one end of a thin-net segment should be connected to  
earth ground. Connection to earth ground at more than one point on  
the segment may cause dangerous ground currents.  
The BNC port of the Coaxial Interface Modules is not connected to  
earth ground.  
Page 2-14  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.3.5 EP IM-A a n d EP IM-X (AUI Por t)  
The EPIM-A is a DB15 female connector used to attach segments to  
an external transceiver. The EPIM-X is equipped with dual internal  
transceivers. It has a DB15 male connector used to attach segments to  
an AUI cable. Figure 2-7 shows both modules.  
Figure 2-7. The EPIM-A and EPIM-X  
DB15 Pinouts  
Pin  
1
2
3
4
5
6
7
Logic Ref.  
Collision +  
Transmit  
Logic Ref.  
Receive +  
9
Collision -  
10 Transmit -  
11 Logic Ref.  
12 Receive -  
13 Power (+12Vdc)  
14 Logic Ref.  
15 No Connection  
Power Return  
No Connection  
Connector Shell: Protective Ground  
Page 2-15  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.4 COM P ORT REQUIREMENTS  
The RJ 45 COM port supports access to a Local Management Console.  
The Console port supports a Digital Equipment Corporation, VT 320™  
terminal or PC emulation of the VT 320™ terminal. Figure 2-8 shows  
the pinouts for the RJ 45 COM port.  
1 2 3 4 5 6 7 8  
COM  
1. Transmit Data  
2. Data Set Ready  
3. Not Used  
5. Signal Ground  
6. Data Terminal Ready  
7. Not Used  
4. Not Used  
8. Not Used  
Figure 2-8. COM Port Pinouts  
2.5 TRANSCEIVER REQUIREMENTS  
When you connect an external network segment, via a transceiver, to  
the SEHI with an EPIM-A, the following requirements must be met:  
The transceiver or Ethernet Device to which the module will be  
connected must meet IEEE 802.3 standards, and/or Ethernet  
Version 1.0 or Version 2.0 standards.  
The Signal Quality Error (SQE) test function on the  
transceiver must be disabled if you connect it to a repeater or  
to an Ethernet Version 1.0 device. In addition, some Version 2.0  
equipment does not support the SQE test. Devices that do not  
support SQE test interpret the SQE test pulse as a collision.  
Page 2-16  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
2.6 OP ERATING SP ECIF ICATIONS  
The operating specifications for the SEHI are described in this section.  
Cabletron Systems reserves the right to change these specifications at  
any time without notice.  
GENERAL  
Operating System Memory:  
Internal Processor:  
1.5 MB  
Intel i960 operating at 16 MHz  
Ethernet Controller:  
National Semiconductor  
DP83916  
Non-Volatile RAM:  
EPROM:  
32 KB with battery back-up  
64 KB  
1 MB  
FLASH MEMORY:  
Dela y Tim es (Sta r t of P a ck ets):  
Twisted Pair to EPIM- A  
Twisted Pair to Twisted Pair  
EPIM-A to Twisted Pair  
1.10 microseconds  
1.00 microseconds  
1.00 microseconds  
Dela y Tim es (J AM):  
Twisted Pair to EPIM-A  
960 nanoseconds  
P r ea m ble:  
Input:  
Minimum of 40 bits required  
Output:  
64 bits min. (last 2 bits are 1, 1)  
Page 2-17  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
J AM Ou tp u t:  
Collisions are propagated  
through the network using the  
J AM signal of an alternating  
pattern of 1's and 0's in  
accordance with 802.3  
specifications for a repeater unit.  
F r a gm en t Exten sion :  
F a u lt P r otection :  
Packet fragments are extended to  
a minimum of 96 bits using the  
J AM [1,0].  
Each segment will disconnect  
itself from the other segments if  
32 consecutive collisions occur, or  
if the collision detector of a  
segment is on for longer than  
approximately 110 µs. This fault  
protection will reset  
automatically after one packet is  
transmitted/received onto the  
fault protected segment without  
causing a collision.  
P OWER SUP P LY REQUIREMENTS  
Note: The SEHI has a universal power supply. This unit allows you to  
use an input power from 90 to 264 VAC, 47-63 Hz.  
The power supply has two outputs of +5 volts and +12 volts. The  
maximum output power is 40 watts and the minimum efficiency is  
65% under all conditions of line at full load. The minimum and  
maximum load current from each output is shown below.  
Ou tp u t  
+5 Volts  
+12 Volts  
Min . Loa d  
0.75 Amps  
0.00 Amps  
Ma x. Loa d  
4 Amps  
Ma x Pow er  
20 Watts  
2 Amps  
24 Watts  
Page 2-18  
 
INSTALLATION REQUIREMENTS/SP ECIF ICATIONS  
ENVIRONMENTAL REQUIREMENTS  
Operating Temperature:  
Non-operating Temperature:  
Operating Humidity:  
SAF ETY  
+5° to +50° C  
-30° to +90° C  
5 to 95% (non-condensing)  
This unit meets the safety requirements of UL 1950, CSA C22.2  
No. 950, and EN 60950; the EMI requirements of FCC Class A and  
EN 55022 Class A; and the EMC requirements of EN 50082-1.  
Wa r n in g: It is the responsibility of the person who sells the system to  
which the SEHI will be a part to ensure that the total system meets  
allowed limits of conducted and radiated emissions.  
P HYSICAL  
Dimensions:  
2.8H x 17.0W x 13.5D inches  
(7.2 x 43.6 x 34.6 cm)  
Weight:  
7 lbs.  
Predicted MTBF:  
SEHI-22/32: 762,931 hours  
SEHI-24/34: 651,695 hours  
Page 2-19  
 
INSTALLATION  
CHAP TER 3  
INSTALLATION  
This chapter outlines the procedure for installing the SEHI to your  
network as a stackable or stand-alone device. Ensure that your  
network meets the guidelines and requirements outlined in Chapter 2,  
In sta lla tion Requ ir em en ts/Sp ecifica tion s, before installing the  
SEHI.  
3.1 UNP ACKING THE SEHI  
Unpack the SEHI as follows:  
1. Remove the shipping material covering the SEHI in the shipping  
box.  
2. Carefully remove the SEHI from the shipping box and set it aside  
to prevent damage.  
3. Visually inspect the SEHI. If there are any signs of damage,  
contact Cabletron Systems Technical Support immediately.  
4. Read the SEHI Release Notes included in the shipping box.  
Note: Cabletron Systems includes a 3-1/ 2" disk with the SEHI. This  
disk contains a backup copy of the SEHIs Flash Firmware Image File.  
You can download the backup image file to the SEHI if the existing  
image becomes corrupted.  
3.2 INSTALLING THE SEHI  
You can install the SEHI to your network as a stackable or  
stand-alone hub. If you want to install the SEHI on a wall or a 19-inch  
rack, Cabletron Systems offers an accessory kit that includes Rack  
Mount Brackets, Wall Mount Brackets, Mounting Screws, and a Strain  
Relief Bracket. The accessory kit is not included with the SEHI, but  
you can purchase it separately from Cabletron Systems as Part  
Number SEHI-ACCY-KIT.  
Page 3-1  
 
INSTALLATION  
Free-standing and shelf installations must be within in reach of the  
network cabling and meet the requirements listed below:  
A single phase 120Vac, 15A, grounded power receptacle must  
be located within 7 feet of the location.  
If you use a shelving unit, it must be able to support 30 pounds  
of static weight for each device in the stack.  
The temperature for the selected location must be maintained  
between 5° and 50°C, and fluctuate less than 10°C per hour.  
The following sections provide instructions for stacking the SEHI or  
installing it as a stand-alone device. Select one of the following  
subsections and perform the steps that are applicable to your  
installation needs.  
3.2.1 Sta ck in g th e SEHI  
The rear panel of the SEHI has an Interconnect Bus Out Port (male  
connector). You daisy chain units together using Cabletron Systems’  
HubSTACK Interconnect cables. Table 3-1 describes each cable.  
Table 3-1. HubSTACK Interconnect Cables  
Pa r t  
Descr ip tion  
Ap p lica tion  
Nu m ber  
9380110  
9380111  
12" HubSTACK  
Interconnect Cable  
SEH to SEH connections.  
SEHI to SEH connections.  
18" HubSTACK  
Interconnect Cable  
Page 3-2  
 
INSTALLATION  
To stack the SEHI together with an SEH non-intelligent hub:  
1. Attach the SEHI HubSTACK Interconnect cable to the OUT” port  
on the rear panel of the SEHI as shown in Figure 3-1.  
2. Attach the other end of the SEHI HubSTACK Interconnect cable to  
the IN” port on the rear panel of the SEH.  
To stack SEH non-intelligent hubs together.  
1. Attach the SEH HubSTACK Interconnect cable to the OUT” port  
on the rear panel of the SEH as shown in Figure 3-1.  
2. Attach the other end of the SEH HubSTACK Interconnect cable to  
the IN” port on the rear panel of the SEH next in the stack.  
REAR VIEW  
SEHI Managing 4 SEH Non-Intelligent Hubs  
SEH-24 10BASE-T HUB WITH LANVIEW®  
SEH INTERCONNECT  
IN  
IN  
IN  
IN  
OUT  
SEH-24 10BASE-T HUB WITH LANVIEW®  
SEH HubSTACK  
Interconnect Cables  
SEH INTERCONNECT  
OUT  
SEH-24 10BASE-T HUB WITH LANVIEW®  
SEH INTERCONNECT  
OUT  
SEH-24 10BASE-T HUB WITH LANVIEW®  
SEHI HubSTACK  
Interconnect Cable  
SEH INTERCONNECT  
OUT  
SEHI-24 10BASE-T HUB WITH LANVIEW®  
SEH INTERCONNECT  
OUT  
Figure 3-1. Stacking the SEHI  
Page 3-3  
 
INSTALLATION  
If you disconnect one end of a HubSTACK Interconnect cable and  
leave the other end attached to the hub, ensure that you disconnect  
the cable from the OUT port as shown in Figure 3-2. This ensures that  
the HubSTACK Interconnect cable is terminated properly.  
Disconnect SEH and SEHI Interconnect Cables  
at the "OUT" Port.  
SEH-24 10BASE-T HUB WITH LANVIEW®  
SEH INTERCONNECT  
OUT  
IN  
IN  
SEH-24 10BASE-T HUB WITH LANVIEW®  
SEH INTERCONNECT  
OUT  
SEHI-24 10BASE-T HUB WITH LANVIEW®  
SEH INTERCONNECT  
OUT  
Figure 3-2. Disconnecting the HubSTACK Interconnect Cable  
3.2.2 Atta ch in g th e Str a in Relief Br a ck et  
Attach the strain relief bracket to the front of the SEHI as follows:  
1. Locate the strain relief bracket and four 8-32 x 3/8" screws from the  
SEHI-ACCY-KIT package.  
Wa r n in g: Use of longer screws may cause damage to the unit or  
electrical shock.  
2. Attach the strain relief bracket to the bottom of the SEHI as shown  
in Figure 3-3.  
HubSTACK 10BASE-T HUB WITH LANVIEW®  
SEHI-24  
Figure 3-3. Attaching the Strain Relief  
Page 3-4  
 
INSTALLATION  
3.2.3 Ra ck Mou n tin g th e SEHI  
Refer to Figure 3-4 and perform these steps to install the SEHI in a  
19-inch rack.  
1. Remove four cover screws (two from each side) located along the  
front edges of each side of the SEHI.  
2. Using the four cover screws removed in step 1, attach the rack  
mounting brackets to each end of the SEHI.  
Wall/Rack Mounting  
Brackets (2)  
HubSTACK 10BASE-T HUB WITH LANVIEW®  
SEHI-24  
Screws (4)  
Figure 3-4. Installing the Rack Mount Brackets  
3. With the mounting brackets installed, position the SEHI between  
the vertical frame members of the 19-inch rack and fasten it  
securely with the mounting screws as shown in Figure 3-5.  
19-Inch Rack  
HubSTACK 10BASE-T HUB WITH LANVIEW®  
SEHI-24  
Screws (4)  
Figure 3-5. Installing the SEHI in the Rack  
Page 3-5  
 
INSTALLATION  
3.2.4 Wa ll Mou n tin g th e SEHI  
When you wall mount the SEHI, the cable connections must face  
down. Refer to Figure 3-6 and perform the following steps to wall  
mount the SEHI.  
Note: 1/ 4-inch Molly screw anchors for wall mounting are not  
included with the SEHI-ACCY-KIT package.  
1. Use the supplied screws to attach the wall mounting brackets to  
the bottom of the SEHI as shown in Figure 3-6. There are two  
brackets, one for each side.  
Molly Screw  
Anchors  
Molly Screws  
Bracket Screws  
Wall Mounting Bracket  
Figure 3-6. Wall Mounting the SEHI  
2. Select the wall location for the SEHI within 7 feet of a power outlet.  
Wa r n in g: There is a potential SHOCK HAZARD if there is electrical  
wiring within the wall that interferes with drilling for pilot holes. Select  
a wall location where drilling pilot holes for the Molly screws will not  
come in contact with electrical wiring in the wall.  
Page 3-6  
 
INSTALLATION  
3. You will need a pencil for this step. With the wall mounting  
brackets attached to the SEHI, position the SEHI against the wall  
where it will be permanently mounted with the network port facing  
down. Use the pencil to mark the wall location for the four pilot  
holes.  
4. Set the SEHI aside and carefully drill four 1/4" pilot holes, one for  
each of the Molly screw anchors and insert the four Molly screw  
anchors into the holes just drilled.  
5. Tighten each of the anchor screws until the anchor expands holding  
the anchor firmly in the wall, then remove the screws completely.  
6. Position the SEHI on the wall over the anchors and reinstall the  
four anchor screws to attach the SEHI to the wall, as shown in  
Figure 3-6. Tighten the four anchor screws.  
3.2.5 Fr ee-Sta n d in g In sta lla tion  
For a free-standing shelf or tabletop installation, locate the SEHI  
within 7 feet of its power source and with an unrestricted free surface  
area 21 inches wide, 18 inches deep and 6 inches high, as shown in  
Figure 3-7.  
21 IN.  
18 IN.  
HubSTACK 10BASE-T HUB WITH LANVIEW®  
SEHI-24  
6 IN.  
7 FT.  
Figure 3-7. Shelf or Table-top Installation  
Page 3-7  
 
INSTALLATION  
3.3 CONNECTING THE SEHI TO THE P OWER SOURCE  
Note: The SEHI has a universal power supply. This allows you to  
connect the SEHI to power sources from 90 Vac to 264 Vac, 47-63 Hz.  
To connect the SEHI to the power source:  
1. Plug the power cord into the back panel of the SEHI.  
2. Plug the other end of the power cord into a grounded wall outlet.  
3. Verify that the P WR LED is on, this indicates that the SEHI is  
receiving power. After the SEHI runs a self test, the CP U LED  
blinks green indicating normal operation. If the LED remains red,  
the processor is faulty.  
Page 3-8  
 
CONNECTING TO THE NETWORK  
CHAP TER 4  
CONNECTING TO THE NETWORK  
This chapter outlines the procedure for connecting the SEHI to your  
network. Ensure that your network meets the guidelines and  
requirements outlined in Chapter 2, In sta lla tion Requ ir em en ts/  
Sp ecifica tion s, before installing the SEHI to your network.  
4.1 CONNECTING THE SEHI TO THE NETWORK  
The procedure for connecting network segments to the SEHI varies  
depending on the media and ports being connected. Refer to the  
following list and perform the procedure described in the subsections  
that apply to your SEHI:  
Network Ports, SEHI-22/24  
Network Ports, SEHI-32/34  
EPIM-T  
EPIM-F1, F2, F3  
EPIM-C  
4.1.1  
4.1.2  
4.1.3  
4.1.4  
4.1.5  
4.1.6  
4.1.7  
EPIM-A  
EPIM-X  
Prior to connecting the network cabling check the connectors for the  
proper pinouts as shown in Chapter 2.  
4.1.1 Con n ectin g to Netw or k Por ts, SEHI-22 a n d SEHI-24  
You attach unshielded twisted pair segments to the RJ 45 Network  
Ports on the front panel of the SEHI. Each twisted pair port on the  
SEHI incorporates a Polarity Detection and Correction feature. The  
Polarity Detection and Correction feature allows the SEHI to pass  
data regardless of the polarity of the twisted pair segments receive  
link. Operating in this condition is not recommended and if this  
condition is discovered, the segment should be removed from the  
network and wired correctly by a technician.  
Page 4-1  
 
CONNECTING TO THE NETWORK  
To connect twisted pair segments to the SEHI:  
1. Insert the RJ 45 connector from each twisted pair segment into the  
desired network port on the SEHI. See Figure 4-1.  
EPIM-2  
LNK  
EPIM-T  
13X  
14X  
15X  
16X  
LNK  
17X  
18X  
EPIM-T  
1X  
2X  
3X  
4X  
EPIM-1  
5X  
6X  
Figure 4-1. SEHI-22/24 Network Ports  
2. Check that the applicable LNK LED for the port is on. If the LED  
is not on, perform each of the following steps until it is:  
a. Check that the 10BASE-T device at the other end of the twisted  
pair segment is powered up.  
b. Verify that the RJ 45 connector on the twisted pair segment has  
the proper pinouts. Check the cable for continuity.  
c. Check that the twisted pair connection meets dB loss and cable  
specifications outlined Chapter 2.  
If a link still has not been established, contact Cabletron Systems  
Technical Support.  
Page 4-2  
 
CONNECTING TO THE NETWORK  
4.1.2 Con n ectin g to Netw or k Por ts, SEHI-32 a n d SEHI-34  
The SEHI-32 has a 50-pin Champ connector, while the SEHI-34 has  
two 50-pin Champ connectors. This configuration of the SEHI allows  
you to run a 50-pin feeder cable from the SEHI to a punch down block.  
Each Champ connector supports 12 10BASE-T, twisted pair segments.  
Note: Refer to Appen d ix A for information about wiring the SEHI to a  
punch down block.  
To connect the SEHI into an existing twisted pair wiring system:  
1. Connect a 50-pin feeder cable to the Champ connector on the SEHI  
as shown in Figure 4-2.  
EPIM-2  
LNK  
EPIM-T  
13X  
LNK  
24X  
EPIM-T  
1X  
EPIM-1  
12X  
Figure 4-2. SEHI-32/34 Network Ports  
2. Attach the feeder cable to the punch down block, or patch panel.  
In most cases, you can connect the feeder cable directly to a  
Champ connector located on the punch down block. If not, you  
must wire the feeder cable to the punch down block using the  
punch down information in Appendix A.  
3. At the device end of a segment, attach the segment to a 10BASE-T  
compliant Ethernet device.  
Page 4-3  
 
CONNECTING TO THE NETWORK  
4. Check that the link LED on the 10BASE-T Ethernet device and the  
applicable LNK LED on the SEHI are on. If the LEDs are not on,  
perform each of the following steps until the LEDs are on:  
a. Check that the 10BASE-T device and the SEHI have power.  
b. Verify the cabling between the SEHI and the 10BASE-T device.  
c. Check the cable for continuity.  
If a link has not been established, contact Cabletron Systems  
Technical Support.  
4.1.3 Con n ectin g a UTP Segm en t to a n EP IM-T  
Before connecting a segment to the EPIM-T, check each end of the  
segment to determine if the wires have been crossed-over for the  
proper connection. If the wires do not cross over, use the switch on the  
EPIM-T to internally cross over the RJ 45 port. Refer to Figure 4-3 to  
properly set the EPIM-T cross-over switch.  
Position X  
(crossed over)  
1. RX+  
2. RX-  
3. TX+  
4. NC  
5. NC  
6. TX-  
7. NC  
8. NC  
Position =  
(not crossed over)  
1. TX+  
2. TX-  
3. RX+  
4. NC  
5. NC  
6. RX-  
7. NC  
8. NC  
Figure 4-3. EPIM-T Cross-over Switch  
Page 4-4  
 
CONNECTING TO THE NETWORK  
To connect an EPIM-T to a Twisted Pair Segment:  
1. Insert the RJ 45 connector on the twisted pair segment into the  
RJ 45 port on the EPIM. See Figure 4-3.  
2. Check that the EPIMs LNK LED is on. If the LED is not on,  
perform each of the following steps until it is:  
a. Check that the 10BASE-T device at the other end of the twisted  
pair segment is powered up.  
b. Verify that the RJ 45 connector on the twisted pair segment has  
the proper pinouts.  
c. Check the cable for continuity.  
d. Check that the twisted pair connection meets dB loss and cable  
specifications outlined in Chapter 2.  
e. Check that the crossover switch is in the correct position.  
If a link still has not been established, contact Cabletron Systems  
Technical Support.  
4.1.4 Con n ectin g a Fiber Op tic Lin k Segm en t to a n EP IM-F 1,  
EP IM-F 2, or EP IM-F 3  
When connecting a fiber optic link segment to an EPIM-F1, F2, or F3  
keep the following in mind:  
If you are connecting a fiber optic link segment with SMA 906  
connectors to an EPIM-F1 with SMA ports, ensure that half  
alignment sleeves are in place on each connector. A full  
alignment sleeve will damage the receive port. SMA 905  
connectors do not need alignment sleeves.  
If you are connecting a fiber optic link segment with ST  
connectors to an EPIM-F2 /F3 with ST ports, keep in mind that  
ST connectors attach to ST ports much like BNC connectors  
attach to BNC ports. Insert the connector into the port with the  
alignment key on the connector inserted into the alignment slot  
on the port. The connector is then turned to lock it down.  
Page 4-5  
 
CONNECTING TO THE NETWORK  
The physical communication link consists of two strands of  
fiber optic cabling: the Transmit (TX) and the Receive (RX). The  
Transmit strand from the applicable port on the module will be  
connected to the Receive port of a fiber optic Ethernet device at  
the other end of the segment. For example, TX of the applicable  
port on the module will go to RX of the other fiber optic device.  
The Receive strand of the applicable port on the module will be  
connected to the Transmit port of the fiber optic Ethernet  
device. For example, RX of the applicable port on the module  
will go to TX of the other fiber optic device.  
We recommend that you label the fiber optic cable to indicate  
which fiber is Receive and which is Transmit. When you buy  
fiber optic cable from Cabletron Systems, it is labeled so that:  
at one end of the cable, one fiber is labeled 1, and the other fiber  
is labeled 2. This pattern is repeated at the other end of the  
cable. If you did not purchase your cable from Cabletron  
Systems, be sure you label your cable as described above.  
Ca u tion : Do not touch the ends of the fiber optic strands, and  
do not let the ends come in contact with dust, dirt, or other  
contaminants. Contamination of the ends can cause problems in  
data transmissions. If the ends become contaminated, clean  
them with alcohol using a soft, clean, lint free cloth.  
To connect a fiber optic link segment to an EPIM-F1, EPIM-F2, or  
EPIM-F3:  
1. Remove the protective plastic covers from the fiber optic ports on  
the applicable port on the module and from the ends of the  
connectors on each fiber strand.  
2. Attach the fiber labeled 1 to the applicable receive port, labeled RX,  
on the module. See Figure 4-4.  
Page 4-6  
 
CONNECTING TO THE NETWORK  
F1/F2  
ST Connectors  
F1/F2  
SMA 906 Connectors w/  
Half Alignment Sleeves  
SMA 905 Connectors  
F3  
ST Connectors  
Figure 4-4. The EPIM-F1, EPIM-F2 and EPIM-F3  
3. Attach the fiber labeled 2 to the applicable transmit port labeled  
TX, on the module.  
4. At the other end of the fiber optic cable, attach the fiber labeled 1  
to the transmit port of the device.  
5. Attach the fiber labeled 2 to the receive port.  
Page 4-7  
 
CONNECTING TO THE NETWORK  
6. Check that the EPIMs LNK LED is on. If the LED is not on,  
perform the following steps until it is:  
a. Check that the power is turned on for the device at the other  
end of the link.  
b. Verify proper cross-over” of fiber strands between the  
applicable port on the module and the fiber optic device at the  
other end of the fiber optic link segment.  
c. Verify that the fiber connection meets the dB loss specifications  
outlined in Chapter 2.  
If a link still has not been established, contact Cabletron Systems  
Technical Support.  
4.1.5 Con n ectin g a Th in -Net Segm en t to a n EP IM-C  
To connect a thin-net segment to an EPIM-C, refer to Figure 4-5 and  
perform the following steps:  
1. Set the Internal Termination Switch to the right of the port and  
labeled TERM to:  
The on position (• ) if the thin-net segment connected directly to  
the port will be internally terminated at the port.  
The off position (o) if the thin-net segment will not be  
terminated at the port or externally terminated.  
2. If the Internal Termination switch is in the On position, connect  
the thin-net segment directly to the BNC port as shown in  
Figure 4-5.  
3. If the Internal Termination switch is in the Off position:  
a. Attach a BNC tee-connector to the BNC port on the module.  
b. Attach the thin-net segment to one of the female connectors on  
the tee-connector.  
Page 4-8  
 
CONNECTING TO THE NETWORK  
Note: You must terminate each segment attached to the tee-connector. If  
you do not attach a segment to one of the female connections on the  
tee-connector, then a terminator must be placed on that connection.  
c. Attach another thin-coax segment or a terminator to the other  
female connector on the tee-connector.  
When internal termination switch  
is set to off ( ):  
Connect BNC tee-connector to port.  
Attach a terminator or terminated  
thin-net segment to one female  
connector of tee-connector.  
Connect a terminated thin-net  
segment to other female connector  
of tee-connector.  
Attach thin-net segment directly to BNC  
connector when internal termination  
switch is set to on ( ).  
Figure 4-5. The EPIM-C  
Page 4-9  
 
CONNECTING TO THE NETWORK  
4.1.6 Con n ectin g a n AUI Ca ble to a n EP IM-A  
Ca u tion : Ensure that the external transceiver to which the SEHI will  
be connected does not have the signal quality error (SQE or heartbeat)  
test function enabled. The SEHI will not operate if the transceiver has  
the SQE test function enabled, and the network will be unusable. Refer  
to the applicable transceiver manual.  
To connect an EPIM-A to an external network segment:  
1. Attach an external transceiver to the network segment that will be  
connected to the AUI port. Refer to the applicable transceiver  
manual.  
2. Attach an AUI cable, no longer than 50 meters in length, to the  
transceiver connected to the network in step 1.  
3. Connect the AUI cable to the AUI port located on the EPIM-A. See  
Figure 4-6.  
4. Lock the AUI connector into place using the connector slide latch.  
EPIM-2  
PWR  
EPIM-A  
13X  
14X  
15X  
16X  
PWR  
17X  
18X  
EPIM-A  
1X  
2X  
3X  
4X  
EPIM-1  
5X  
6X  
Figure 4-6. The EPIM-A  
Page 4-10  
 
CONNECTING TO THE NETWORK  
5. Check that the P WR LED on the EPIM-A is on. If the LED is not  
on, contact Cabletron Systems Technical Support.  
6. If the P WR LED is on with the AUI cable disconnected, continue  
with the following checks:  
a. Check the AUI connections for proper pinouts. The pinouts for  
the transceiver connection are listed in Chapter 2.  
b. Check the cable for continuity.  
c. Reconnect the AUI cable to the SEHI and the device.  
If the LED is still not on after reconnecting the segment, contact  
Cabletron Systems Technical Support.  
4.1.7 Con n ectin g a n AUI Ca ble to a n EP IM-X  
Ca u tion : The signal quality error (SQE) switch remains in the OFF  
position for most network connections. However, some Data Terminal  
Equipment (DTE) requires SQE. Refer to your DTE manual for SQE  
requirement information.  
To connect an EPIM-X to a device not requiring SQE:  
1. Check that the SQE LED on the EPIM-X is off. If the SQE LED is  
on, check the position of the SQE switch.  
Note: If the SQE light remains on, even though the SQE switch is  
in the OFF position, contact Cabletron Technical Support.  
2. Attach one end of an AUI cable, no longer than 50 meters in length,  
to the port located on the EPIM-X (Figure 4-7) and the other end to  
the intended node.  
Page 4-11  
 
CONNECTING TO THE NETWORK  
ON  
ON Position  
(Toward Back  
OFF  
of EPIM)  
OFF Position  
(Toward Front  
of EPIM)  
Figure 4-7. The EPIM-X  
4.2 F INISHING THE INSTALLATION  
The SEHI is now ready for operation. Before placing the network into  
service, test the installation thoroughly, making sure that you can  
address all stations and that the SEHI and all stations are indicating  
normal operation. Ensure that the networking software is configured  
properly to match the installed network. If you encounter errors or  
abnormal operation, proceed to Chapter 5, Tr ou blesh ootin g.  
Page 4-12  
 
TROUBLESHOOTING  
CHAP TER 5  
TROUBLESHOOTING  
This chapter contains instructions for using LANVIEW LEDs to  
troubleshoot physical layer network problems. It also describes how to  
reset the SEHI.  
5.1 INSTALLATION CHECK-OUT  
After you connect the SEHI to the network, verify that packets pass  
between all Ethernet devices connected to the SEHI and any other  
devices connected to the network. If you encounter difficulty with any  
of the attached devices, check the link as follows:  
1. Check that the LNK LED, if applicable, for the port is on. If the  
LED is not on:  
a. Check that the 10BASE-T device at the other end of the twisted  
pair segment is powered up.  
b. Verify that the connector on the twisted pair segment has the  
proper pinouts. Refer to Chapter 2 for the pin assignments for  
twisted pair connectors.  
For EPIM-F1/EPIM-F2 check that the TX and RX fibers are  
properly connected.  
c. Check the cable for continuity. A variety of tools are available  
for this test, depending on the media you are using.  
d. Check that the twisted pair segments meet cable specifications  
for dB loss described in Chapter 2.  
Page 5-1  
 
TROUBLESHOOTING  
2. If the remote station is ready and the LNK LED is on, but no data  
passes through the port, one of two conditions may exist:  
Network management has disabled the port.  
The port is segmented either because the collision detector was  
on for more than 110 µsec. or the SEHI detected more than 32  
consecutive collisions on the attached segment. The affected  
port remains segmented until a good packet is transmitted/  
received without collisions.  
If the LNK LED is still not on, contact Cabletron Systems Technical  
Support.  
5.2 USING LANVIEW  
The SEHI incorporates the Cabletron Systems LANVIEW Status  
Monitoring and Diagnostics System. LANVIEW LEDs can help  
diagnose problems such as a power failure or a cable fault. The SEHI  
includes the following LANVIEW LEDs:  
P WR, for power status  
CP U, for board status  
RCV (Receive), LNK (Link), and CLN (Collision) for Ethernet  
status.  
Figure 5-1 provides a quick reference chart of LED locations and  
definitions. This chapter also includes a detailed description of each  
LED.  
Page 5-2  
 
TROUBLESHOOTING  
HubSTACK 10BASE-T HUB WITH LANVIEW®  
SEHI-24  
RCV  
LNK  
E
24X  
24 23 22 21 20 19 18 17 16 15 14 13 2  
PWR  
CPU  
CLN  
RCV  
LNK  
RESET  
E
1
COM  
12 11 10  
9
8
7
6
5
4
3
2
1
12X  
LED NAME  
LED COLOR  
DEFINITION  
PWR  
(Power)  
Off  
No Power  
Power  
Green (Solid)  
CPU  
Off  
CPU in BOOT Process  
CPU Initializing  
(Central Processing Unit)  
Green (Flashing)  
Green (Blinking)  
Red (Solid)  
CPU Functioning  
CPU Not Functioning  
CLN  
(Collision)  
Red  
Collision  
RCV  
(Receive)  
Yellow (Flashing)  
Off  
SEHI is Receiving Data  
No Activity  
LNK  
(Link)  
Green  
Off  
Link Established  
No Link  
Note: “Flashing” indicates an irregular LED pulse.  
“Blinking” indicates a steady LED pulse.  
Figure 5-1. LANVIEW LEDs  
P WR  
When this green LED is on it indicates that the SEHI is receiving  
power. If this LED is not on, it indicates a loss of input power. Check  
the input power source (circuit breaker, fuse, etc.). If the proper source  
power is present, the problem could be with the SEHI.  
CP U  
This LED alternates from red to green to during power up. After the  
boot is complete, the LED blinks green. A blinking green LED  
indicates normal operation. A red LED indicates a faulty processor.  
Page 5-3  
 
TROUBLESHOOTING  
CLN  
This red LED indicates that a collision has occurred on one of the  
ports.  
RCV  
When this yellow LED flashes, it indicates that the SEHI is receiving  
data packets from the associated port segment. Each SEHI port has a  
corresponding RCV LED:  
Network Ports: RCV LEDs 1-24  
EPIM-1: RCV LED E1  
EPIM-2: RCV LED E2  
LNK  
When a green LNK LED is on, it indicates an established link between  
the associated twisted pair segment and the 10BASE-T device at the  
other end of the segment. LNK LEDs will remain on as long as a link  
is maintained. Each SEHI Network Port (ports 1-24) has a  
corresponding LNK LED.  
5.3 USING THE RESET BUTTON  
The SEHI incorporates a recessed Reset button. See Figure 5-1. This  
Reset button initializes the SEHI processor. This button does NOT  
initialize Non-Volatile Random Access Memory (NVRAM), the  
non-volatile random access memory where the SEHI stores network  
management parameters.  
To use the Reset button, use a pen or pencil to press the button in.  
When this is done, the SEHI initializes itself.  
Page 5-4  
 
LOCAL MANAGEMENT  
CHAP TER 6  
LOCAL MANAGEMENT  
This chapter explains how to set up a management terminal to access  
the SEHIs Local Management. It also explains how to use the Local  
Management screens and commands.  
Local Management supplies the tools to manage the SEHI and all of  
its attached segments. You can:  
assign an IP address and subnet mask  
select a default gateway  
control access to the SEHI through the community names  
established in the Community Name Table  
designate which Network Management Workstations receive  
trap messages from the device  
navigate through the Management Information Base (MIB)  
and manage the objects within it from a remote location. Given  
the appropriate security level, the MIB is accessible from the  
SEHI through SNMP Tools.  
Local Management also lets you manage each of the non-intelligent  
stackable hubs attached to the SEHI. You can also use the Statistics  
screen to view error, collision, and traffic statistics for the entire stack,  
individual module, or individual port.  
Page 6-1  
 
LOCAL MANAGEMENT  
6.1 MANAGEMENT TERMINAL REQUIREMENTS  
To access Local Management you need one of the following:  
a Digital Equipment Corporation VT series terminal  
a VT type terminal running emulation programs for the Digital  
Equipment Corporation VT series  
an IBM or compatible PC running a VT series emulation  
software package.  
You also need a console cable to attach the management terminal to  
the SEHI. The console cable is not included with the SEHI, but you  
can purchase it separately from Cabletron as part number  
SEHI-ACCY-KIT.  
The SEHI-ACCY-KIT package provides an RJ 45 Cable Kit that  
includes the following:  
UTP console cable with RJ 45 connectors on each end  
Adapters for DB9 or DB25 connections  
Instruction Sheet  
The following sections explain how to attach the console cable and set  
up the management terminal. Refer to the RJ 45 Cable Kit Instruction  
Sheet for adapter pinouts and additional information.  
Page 6-2  
 
LOCAL MANAGEMENT  
6.1.1 Con sole Ca ble Con figu r a tion  
Use the RJ 45 Cable Kit provided with the SEHI-ACCY-KIT package  
to attach the management terminal to the SEHIs COM port as shown  
in Figure 6-1.  
Connect the console cable to the SEHI as follows:  
1. Attach the male RJ 45 connector to the COM port of the SEHI.  
2. Attach the female end (25-pin or 9-pin, as applicable) to the COMM  
port on the terminal.  
EPIM-2  
HubSTACK 10BASE-T HUB WITH LANVIEW®  
SEHI-24  
EPIM-1  
COM  
COM RJ45 PORT  
MANAGEMENT TERMINAL  
CONSOLE CABLE  
COM PORT  
Figure 6-1. Management Terminal Connection  
Page 6-3  
 
LOCAL MANAGEMENT  
6.1.2 Ma n a gem en t Ter m in a l Setu p Pa r a m eter s  
Table 6-1 lists the setup parameters for the local management  
terminal. If your terminal is a Digital Equipment Corporation  
VT320™ terminal, press F 3 to access the Setup Directory. If you have  
a terminal emulation of the VT320™, refer to your equipment user  
manual for setup procedures.  
Table 6-1. Terminal Setup Parameters  
Men u  
F u n ction  
Columns  
Selection  
80 Columns  
Disp la y Setu p :  
Controls  
Auto Wrap  
Test Cursor  
Mode  
Interpret Controls  
No Auto Wrap  
Cursor  
Gen er a l Setu p :  
7 Bit Control  
Cursor Keys  
Transmit  
Receive  
Normal Cursor Keys  
Transmit = 9600  
Receive = Transmit  
any option  
Com m u n ica tion s  
Setu p :  
XOFF  
Bits, Parity  
Stop Bit  
Local Echo  
Port  
8 Bits, No Parity  
1 Stop Bit  
No Local Echo  
DEC-423,  
Data Leads Only  
Transmit  
any option  
Auto Answerback  
Auto Repeat  
Keyclick  
No Auto Answerback  
any option  
Keyboa r d Setu p :  
any option  
Margin Bell  
Warning Bell  
Auto Answerback  
Margin Bell  
Warning Bell  
No Auto Answerback  
Page 6-4  
 
LOCAL MANAGEMENT  
6.2 ACCESSING LOCAL MANAGEMENT  
After you configure the local management terminal and properly  
attach the cables to the SEHI, you can access the Local Management  
interface.  
To access Local Management:  
1. Power up the terminal. The SEHI Password screen shown in  
Figure 6-2 appears.  
SEHI LOCAL MANAGEMENT  
Cabletron SEHI Revision X.XX.XX  
Cabletron Systems Incorporated  
35 Industrial Way, P.O. Box 5005  
Rochester, NH 03867-0505 U.S.A.  
(603) 332-9400  
(c) Copyright Cabletron Systems, Inc. 1993  
SEHI F/W Version: X.XX.XX  
Boot Prom Version: X.XX.XX  
SEHI Board Version: X.X  
EnterUser Password:  
Figure 6-2. Password Screen  
2. Enter your P a ssw or d . The factory default password for  
Super-User access is public” or the Retu r n key.  
Note: Your password is one of the community names specified in the  
Community Name Table. Access to certain Local Management  
capabilities depends on the degree of access accorded that community  
name. See Section 6.3.1 for more details about community names.  
Page 6-5  
 
LOCAL MANAGEMENT  
3. Press the Retu r n key.  
If your password entry is invalid, the cursor returns to the  
beginning of the password entry field.  
If your password is valid, the associated access privilege  
appears briefly, then the SEHI Local Management Feature  
Selection screen shown in Figure 6-3 appears.  
Note: If you do not use the terminal keyboard for 15 minutes, your Local  
Management session ends and the screen defaults to the Password  
screen.  
SEHI LOCAL MANAGEMENT  
Cabletron Systems Incorporated  
P.O. Box 5005 Rochester, NH 03867-0505 U.S.A.  
(603) 332-9400  
FEATURE SELECTION  
F6 COMMUNITY NAME TABLE  
F7 IPADDRESS ASSIGNMENT  
F8 COMPONENT TRAP TABLE  
F9 SNMP TOOL SUPPORT  
DEVICE STATISTICS  
EXIT LIM SERVICE  
Figure 6-3. Feature Selection Screen  
Page 6-6  
 
LOCAL MANAGEMENT  
6.3 USING THE LOCAL MANAGEMENT SCREENS  
The Feature Selection screen is the main menu screen for SEHI Local  
Management. You can select five screen options in the Feature  
Selection screen: Community Name Table, IP Address Assignment,  
Component Trap Table, SNMP Tool Support, and Device Statistics.  
Use the arrow keys to highlight an option, then press Retu r n (or  
press the corresponding F u n ction Key). The selected screen appears.  
To exit your Local Management session, use the arrow keys to  
highlight the EXIT LIM SERVICE command, then press Retu r n .  
6.3.1 Th e Com m u n ity Na m e Ta ble Scr een  
To access the Community Name Table screen from the Feature  
Selection screen, use the arrow keys to highlight the Com m u n ity  
Na m e Ta ble option, then press Retu r n or F 6. The Community Name  
Table screen shown in Figure 6-4 appears.  
SEHI LOCAL MANAGEMENT  
Cabletron SEHI Revision X.XX.XX  
COMMUNITY NAME TABLE  
COMMUNITY NAME  
ACCESS  
PUBLIC  
PUBLIC  
PUBLIC  
PUBLIC  
BASIC-READ  
READ-ONLY  
READ-WRITE  
SUPER-USER  
SAVE  
F6  
IP TABLE  
F7  
TRAP TABLE  
F8  
SNMP TOOLS  
F9  
RETURN  
Figure 6-4. Community Name Table Screen  
Page 6-7  
 
LOCAL MANAGEMENT  
The Community Name Table option lets you set community names.  
Community names are passwords to Local Management and they are  
agents of security control to your SEHI. You control SEHI access by  
establishing up to four different levels of security authorization:  
Basic-Read, Read-Only, Read-Write, and Super-User.  
If you have Super-User access, you can change the existing passwords  
by changing the community names. Only the community name  
assigned Super-User access has full management privileges.  
The following sections explain each field on the Community Name  
Table screen and instructions on how to change them.  
Com m u n ity Na m e  
Displays the user-defined name through which a user can access Local  
Management for the SEHI. Any community name assigned here acts  
as a password to Local Management.  
Access  
Indicates the access status accorded each community name. Possible  
conditions are:  
Basic-Read  
This allows read only access to Local  
Management, but excludes read privileges  
to the Component Trap screen.  
Read-Only  
This allows read only access to Local  
Management, but excludes access to  
security protected fields of the upper levels  
of authorization (Read-Write or Super-  
User).  
Read-Write  
Super-User  
This allows you to read and write to Local  
Management fields, Excluding IP Address,  
Subnet Mask, and Community Names.  
This access privilege gives the user read  
and write access to Local Management.  
Super-User allows read and write access to  
all modifiable parameters including:  
Community Names, IP Addresses, Traps,  
and SNMP Objects.  
Page 6-8  
 
LOCAL MANAGEMENT  
Ed itin g th e Com m u n ity Na m e F ield  
The password that you use to access Local Management at the  
Password screen must have Super-User privileges for your edits to  
take effect. If you enter a password with Basic-Read, Read-Only, or  
Read-Write privileges, Local Management displays the message  
AUTHORIZATION PROHIBITS ACCESS, and does not include  
editing capabilities.  
To edit the Community Name field:  
1. Use the arrow keys to highlight the Com m u n ity Na m e field  
adjacent to the access level of your choice.  
2. Enter the community name, up to 32 characters in length, into the  
field.  
3. Press the Retu r n key.  
4. Repeat steps 1-3 for editing any of the other community names.  
5. Use the arrow keys to highlight the SAVE command at the bottom  
of the screen, then press the Retu r n key or F6. The SAVED OK”  
message appears indicating that your edits have been saved to  
memory.  
Please note that the first time you try to exit the screen without  
saving your changes, you will get a NOT SAVED?” message. If  
you proceed to exit without saving, you will lose your edits.  
6. To exit the screen, press the appropriate Function key or use the  
arrow keys to highlight the RETURN command.  
7. Press the Retu r n k ey. The Feature Selection screen appears.  
Page 6-9  
 
LOCAL MANAGEMENT  
6.3.2 Th e Con figu r a tion Scr een  
To access the Configuration screen from the Feature Selection screen,  
use the arrow keys to highlight the IP Ad d r ess Assign m en t option  
then press the Retu r n key or F 7. The Configuration screen shown in  
Figure 6-5 appears.  
SEHI LOCAL MANAGEMENT  
Cabletron SEHI Revision X.XX.XX  
CONFIGURATION  
I/F  
1
IPAddress  
SubNET Mask  
MACAddress  
000.000.000.000 000.000.000.000  
00-00-1d-05-dc-36  
Default Gateway: 0.0.0.0  
Serial Port 1Application: CONSOLE Baud Rate: 9600 --ACTIVE--  
Port Enable Override: OVERRIDE DISABLED  
SAVE  
F6  
COMMUNITY NAMES TRAP TABLE  
F7 F8  
SNMP TOOLS  
F9  
RETURN  
Figure 6-5. Configuration Screen  
The SEHI Configuration screen lets you assign the IP Address, Subnet  
Mask, and Default Gateway. You can also use the Port Enable  
Override option to enable all device ports in the stack. This option  
overrides the Port Disable setting in the Statistics screen.  
The following sections explain each field on the Configuration screen  
and instructions on how to change them.  
I/F  
Gives the number of the interface corresponding to the channels over  
which packets with that IP Address are passing. On the SEHI, this  
value is always 1.  
IP Ad d r ess  
Displays the IP address of the SEHI.  
Page 6-10  
 
LOCAL MANAGEMENT  
Su bNet Ma sk  
Displays the subnet mask for the SEHI. A subnet mask is a 32-bit  
quantity which “masks out” the network bits of the IP address. This is  
done by setting the bits in the mask to 1 when the network treats the  
corresponding bits in the IP address as part of the network or  
subnetwork address, or to 0 if the corresponding bit identifies the host.  
MAC Ad d r ess  
Displays the physical address associated with the interface.  
Defa u lt Ga tew a y  
Displays the default gateway for the SEHI. This field is not defined  
until you enter an appropriate value. The default gateway identifies  
the default gateway device that will forward packets to other IP  
subnetworks.  
Ser ia l P or t Ap p lica tion  
Displays the ports application setting as CONSOLE.  
Ba u d Ra te  
Displays the Baud Rate setting of the device attached to the SEHI  
through the serial port. The setting for the serial port is 9600.  
P or t En a ble Over r id e  
This command lets you override the Disable Port settings in the  
Device Statistics screen to enable all ports in the stack.  
Settin g th e IP Ad d r ess  
To set the IP Address:  
1. Use the arrow keys to highlight the IP Ad d r ess field.  
2. Enter the IP address into this field. The format for this entry is  
XXX.XXX.XXX.XXX, with values for XXX being from 0 to 255. The  
screen beeps if you enter non-numerics or adjacent dots. If the  
entry does not have three dots it will be rejected.  
3. Press Retu r n . The IP address appears and the natural subnet  
mask for the user is generated and appears also.  
Page 6-11  
 
LOCAL MANAGEMENT  
4. Use the arrow keys to highlight the SAVE option, then press the  
Retu r n key or F 6. The SAVED OK” message appears indicating  
that the changes have been saved to memory.  
Please note that the first time you try to exit the screen without  
saving your changes, you will get a NOT SAVED?” message. If you  
proceed to exit without saving, you will lose your edits.  
Settin g th e Su bn et Ma sk  
Note: Consult your Network Administrator prior to setting the Subnet  
Mask.  
The subnet mask defines how your SEHI treats SNMP Trap IP  
destination addresses in its Trap Table.  
Set the subnet mask when workstations in the Trap Table  
reside on a different subnet (i.e., across a gateway or router),  
and you want these workstations to receive SNMP traps.  
Use the subnet mask factory default setting of 0.0.0.0 when all  
trap designated workstations are on the SEHI subnet.  
To set the subnet mask:  
1. Use the arrow keys to highlight the Su bNET Ma sk field.  
2. Enter the subnet mask into this field. The format for this entry is  
XXX.XXX.XXX.XXX with values for XXX being from 0 to 255.  
3. Press the Retu r n key.  
4. Use the arrow keys to highlight the SAVE option, then press the  
Retu r n key or F 6. The SAVED OK” message appears indicating  
that the changes have been saved to memory.  
Please note that the first time you try to exit the screen without  
saving your changes, you will get a NOT SAVED?” message. If you  
proceed to exit without saving, you will lose your edits.  
Page 6-12  
 
LOCAL MANAGEMENT  
Settin g th e Defa u lt Ga tew a y  
The Default Gateway field allows you to describe the router through  
which the SEHI will be forwarding IP packets.  
To set the Default Gateway:  
1. Use the arrow keys to highlight the Defa u lt Ga tew a y field.  
2. Enter the gateways default mask in this field. The format for this  
entry is XXX.XXX.XXX.XXX with values for XXX being from 0 to  
255.  
3. Press the Retu r n key. If your entry is accepted as a valid default  
gateway, OK” appears to the right of the field.  
4. Use the arrow keys to highlight the SAVE option, then press the  
Retu r n key or F 6. The SAVED OK” message appears indicating  
that the changes have been saved to memory.  
Usin g th e P or t ENABLE Over r id e  
To set the Port ENABLE Override:  
1. Use the arrow keys to highlight the P or t ENABLE Over r id e  
field.  
2. Press the Retu r n key to toggle from the default setting of  
OVERRIDE DISABLED” to OVERRIDE ENABLED.  
3. The adjacent field displays Y/N. Enter Y to continue enabling all  
of the ports, or N to discontinue the port enable override. If you  
answer Y, all existing ports are enabled, and the message PORT  
ENABLED” appears.  
Page 6-13  
 
LOCAL MANAGEMENT  
Exitin g th e Con figu r a tion Scr een  
1. To exit the Configuration screen, press the appropriate F u n ction  
k ey. To return to the Feature Selection screen, use the arrow keys  
to highlight the RETURN command.  
2. Press the Retu r n key. The Feature Selection screen appears.  
6.3.3 Th e Tr a p Ta ble Scr een  
To access the Trap Table screen from the Features Selection screen,  
use the arrow keys to highlight the Com p on en t Tr a p Ta ble option,  
then press the Retu r n key or F 8. The Trap Table screen shown in  
Figure 6-6 appears.  
SEHI LOCAL MANAGEMENT  
Cabletron SEHI Revision X.XX.XX  
TRAP TABLE  
IPAddress  
SNMP Community Name  
Traps  
<CR>  
<CR>  
<CR>  
<CR>  
<CR>  
<CR>  
<CR>  
<CR>  
0.0.0.0  
0.0.0.0  
0.0.0.0  
0.0.0.0  
0.0.0.0  
0.0.0.0  
0.0.0.0  
0.0.0.0  
N
N
N
N
N
N
N
N
SAVE  
F6  
COMMUNITY NAMES  
F7  
IP TABLE  
F8  
SNMP TOOLS  
F9  
RETURN  
Figure 6-6. Trap Table Screen  
The Trap Table defines the management stations that will receive  
SNMP Traps for alarm/event notification. The following sections  
explain each field on the Trap Table screen and instructions on how to  
change them.  
Page 6-14  
 
LOCAL MANAGEMENT  
SNMP Com m u n ity Na m e  
Displays the community name to be included in the trap message,  
which is sent to the Network Management Station with the associated  
IP address.  
Tr a p s  
Enables transmission of the traps to the network management station  
with the associated IP address.  
Tr a p IP Ad d r ess  
Indicates the IP address of the workstation to receive trap alarms  
from the SEHI.  
Con figu r in g th e Tr a p Ta ble  
1. Use the arrow keys to highlight the SNMP Com m u n ity Na m e  
field, then enter the community name.  
2. Press the Retu r n key.  
3. Use the arrow keys to highlight the Tr a p s field and enter Y (or y)  
to send alarms from the SEHI to the workstation, or N (or n ) to  
prevent alarms from being sent.  
4. Press the Retu r n key.  
5. Use the arrow keys to highlight the appropriate Tr a p IP Ad d r ess  
field.  
6. Enter the IP address of the workstation that you want to send traps  
to in this field. The format for this entry is XXX.XXX.XXX.XXX,  
with the value of XXX ranging from 0 to 255, and three dots, or else  
it returns to the beginning of the field.  
7. Use the arrow keys to highlight the SAVE option, then press the  
Retu r n key or F 6. The SAVED OK” message appears indicating  
that the changes have been saved to memory.  
Page 6-15  
 
LOCAL MANAGEMENT  
Exitin g th e Tr a p Ta ble Scr een  
1. To exit the Trap Table screen, press the appropriate Function key.  
To exit to the Feature Selection screen, use the arrow keys to  
highlight the RETURN command.  
2. Press the Retu r n key. The Feature Selection screen appears.  
6.3.4 Th e SNMP Tools Scr een  
This section describes how you can use the SNMP Tools screen to  
access Management Information Bases (MIBs). Access to screen  
options depends on the access status accorded to your community  
name. This section describes Super-User management capabilities.  
SNMP Tools allows you access to valuable MIB information. You can  
get information about specific object identifiers (OIDs), edit the values  
of configurable OIDs, and request the OID numerically sequential to  
the originally requested OID.  
Other ways to view OIDs from the SNMP Tools screen include  
Walking, Stepping, and Cycling. Walk and Cycle let you review several  
OIDs at a time.  
To access the SNMP Tools screen from the Features Selection screen,  
use the arrow keys to highlight the SNMP Tools Su p p or t option,  
then press the Retu r n key or F 9. The SNMP Tools screen shown in  
Figure 6-7 appears.  
Page 6-16  
 
LOCAL MANAGEMENT  
SEHI LOCAL MANAGEMENT  
Cabletron SEHI Revision X.XX.XX  
SNMP TOOLS  
SNMP COMMUNITY NAME: public  
OID PREPEND: 1.3.6.1  
GET SET GETNEXT WALK RECALL-OID STEP CYCLES REPEAT  
F6  
F7  
F8  
F9  
RETURN  
F10  
Figure 6-7. SNMP Tools Screen  
The following sections describe SNMP Tools screen fields and  
instructions on how to change them.  
Com m u n ity Na m e  
Identifies the community name used as a password to determine  
access level to the MIB component.  
OID P r ep en d  
Specifies the number prefix common to all Object Identifiers (OIDs)  
found in the MIBs - 1.3.6.1 is the default prefix OID. This is a  
modifiable field.  
Get  
Lets you retrieve MIB objects using SNMP protocol.  
Set  
Lets users with Read-Write and Super-User access change modifiable  
MIB objects, using SNMP protocol.  
Get Next  
Displays the OID following the current OID.  
Page 6-17  
 
LOCAL MANAGEMENT  
Wa lk  
Scrolls you through a section of the MIB leaf by leaf, from a  
user-specified object identifier. Leaves are the sections of the OID  
separated by periods. When a walk is initialized you will see the  
following categories for each walk entry, or step.  
Specified OID - gives the number tag for that OID.  
Size - identifies the number of bytes it takes to store that object.  
Type - specifies the objects variable type (e.g., int = integer).  
Data - displays what the object identifier represents.  
Reca ll-OID  
Recalls, from memory, the last OID used.  
Step  
Displays the MIB walk, step by step, giving you time to view specific  
leaves in detail.  
Cycles  
Allows you to specify the number of get next requests to cycle through  
and how much time will elapse between each request.  
Rep ea t  
Repeats the last Get command, allowing you to monitor changes to a  
specific OID.  
Page 6-18  
 
LOCAL MANAGEMENT  
Gettin g In d ivid u a l OIDs  
To get an OID:  
1. Highlight GET, using the arrow keys, then press the Retu r n key  
(or press the F 6 function key). <GET> OID (=| F9)” appears.  
2. Enter the OID either by:  
using the keyboard to enter the OID minus the OIDs prepend  
(e.g., if the prepend is 1.3.6.1, and you enter 4.1.3, then the  
OID=1.3.6.1.4.1.3).  
entering an = and the OID suffix (e.g., if you enter =4.1.3, then  
the OID=4.1.3). This allows you to digress and not use the  
prepend.  
pressing F 9 to recall an OID already entered. You can then use  
the keyboard to modify the recalled OID as necessary.  
3. Press the Retu r n key. If there is no instance of that OID, the  
return code will specify MIB_NO_INSTANCE, otherwise,  
information about that OIDs data type, length, and value appear.  
Gettin g th e Next OID  
To get the next OID:  
1. Highlight GETNEXT, using the arrow keys, then press the  
Retu r n key (or press the F 8 function key). <GETNEXT> OID  
(=| F9)” appears.  
2. Enter the desired OID, or OID extension. (Press F9 to recall the  
last OID request. You can then modify the recalled OID as  
necessary.)  
3. Press the Retu r n key. If there is no instance of that OID, the  
return code will specify MIB_NO_INSTANCE, otherwise,  
information about that OIDs data type, length, and value appear.  
Page 6-19  
 
LOCAL MANAGEMENT  
Settin g a n OID  
To set an OID:  
1. Highlight SET, using the arrow keys, then press the Retu r n key  
(or press the F 7 function key). <SET> OID (=| F9)” appears.  
2. Enter the OID, minus the OIDs prepend. If you have previously  
entered an OID, pressing F 9 recalls that entry for you. You can  
then use the arrow keys to modify the recalled OID if necessary.  
3. Press the Retu r n key. If there is no instance of that OID, the  
return code will specify MIB_NO_INSTANCE, otherwise DATA  
TYPE:appears.  
4. Enter the data type for that OID. Possible choices are: integer,  
string, null, OID, IP address, counter, gauge, timeticks, and  
opaque.  
5. Press the Retu r n key. DATA” appears.  
6. Enter the value to correspond to the OID. If accepted, <SET>  
OPERATION CODE: XXXX <OK>” appears, otherwise an error  
message appears.  
View in g Mu ltip le OIDs  
Viewing several object identifiers at one time allows you to quickly  
scan a MIB for the specific information that you need. The Walk scrolls  
through OIDs numerically sequential to the initial OID request. The  
Step command scrolls the MIB Walk, one OID at a time. Cycling  
allows you to specify how many GetNext commands to cycle through  
for one OID.  
Page 6-20  
 
LOCAL MANAGEMENT  
Wa lk in g Th r ou gh OIDs  
To walk through an OID:  
1. Highlight Wa lk , using the arrow keys, then press the Retu r n key.  
<INITIAL> OID (=| F9)” appears.  
2. Enter the OID (minus the prepend) and press the Retu r n key. The  
screen will begin walking through the sublayers of the MIB  
available from the specified OID. Each OID listed displays the  
specified OID, its size, its type, and the data it contains.  
3. Press the Sp a ce Ba r to stop the walk, or wait for ***MIB WALK  
COMPLETED***” to appear on the screen.  
Step p in g Th r ou gh OIDs  
To step through an OID (you can step through only after a GetNext):  
1. Highlight Step , using the arrow keys, then press the Retu r n key.  
Specify OID” appears.  
2. Enter the OID (only the suffix is necessary) and press Retu r n . The  
Tools screen will begin to scroll one OID at a time, through all of  
the sublayers of the MIB available for that OID.  
Cyclin g Th r ou gh OIDs  
To cycle through an OID:  
1. Use the arrow keys to Highlight CYCLES, then press Retu r n .  
2. Enter the number of cycles that you want to occur after ENTER  
CYCLE COUNT:, then press the Retu r n key.  
3. Enter how many seconds delay that you want between get next  
requests after ENTER CYCLE DELAY (secs):, then press the  
Retu r n key.  
Page 6-21  
 
LOCAL MANAGEMENT  
Exitin g th e SNMP Tools Scr een  
1. Use the arrow keys to highlight the RETURN command.  
2. Press the Retu r n key. The Feature Selection screen appears.  
6.3.5 Th e Device Sta tistics Scr een  
This section describes the features of the Device Statistics screen. You  
can view error, collision, and traffic statistics for the stack, a selected  
module, or a selected port. You can also enable and disable ports.  
To access the Statistics screen from the Features Selection screen, use  
the arrow keys to highlight the Device Sta tistics option, then press  
the Retu r n key. The Device Statistics screen shown in Figure 6-8  
appears.  
SEHI LOCAL MANAGEMENT  
Cabletron SEHI Revision X.XX.XX  
DEVICE STATISTICS  
MODULE: 1  
PORT: 1  
STACK TOTAL  
67960  
255  
67960  
255  
BYTES RECEIVED:  
FRAMES RECEIVED:  
3792125  
16547  
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
ERRORS RECEIVED:  
COLLISIONS:  
OOW COLLISIONS:  
CRC ERRORS:  
ALIGNMENT ERRORS:  
RUNT PACKETS:  
GIANT PACKETS:  
PORTADMIN. STATUS:  
PORT SEG. STATUS:  
0
0
0
0
0
0
0
0
ENABLE  
UNSEGMENTED  
ENABLE PORT  
UPDATE -FREQ 3 Sec  
DISABLE PORT  
MODULE  
1
PORT  
1
RETURN  
Figure 6-8. Device Statistics Screen  
The following sections describe Device Statistics screen fields and  
instructions on how to change them.  
Page 6-22  
 
LOCAL MANAGEMENT  
Bytes Received  
Displays the number of bytes received.  
F r a m es Received  
Displays the number of frames received.  
Er r or s Received  
Displays the number of errors received.  
Collision s  
Displays the number of collisions received.  
OOW Collision s  
Displays the number of Out Of Window collisions. OOW collisions are  
usually caused by the network being too long where the round trip  
propagation delay is greater than 51.2 µ sec (the collision domain is  
too large), a station somewhere on the network is violating Carrier  
Sense and transmitting at will, or a cable somewhere on the network  
failed during the transmission of the packet.  
CRC Er r or s  
Displays the number of packets with bad Cyclic Redundancy Checks  
(CRC) that have been received from the network. The CRC is a 4 byte  
field in the data packet that ensures that the transmitted data that is  
received is the same as the data that was originally sent.  
Align m en t Er r or s  
Displays the number of errors due to misaligned packets.  
Ru n t P a ck ets  
Displays the number of runt packets received from the network. A  
runt packet is less than the minimum Ethernet frame size of 64 bytes,  
not including preamble.  
Gia n t P a ck ets  
Displays the number of packets received whose size exceeded 1518  
data bytes, not including preamble.  
P or t Ad m in . Sta tu s  
Displays the administrative status of the port selected. The two  
possible status messages are Enable or Disable.  
Page 6-23  
 
LOCAL MANAGEMENT  
P or t Seg. Sta tu s  
Displays the segmentation status of the port selected. The two  
possible status messages are Segmented or Unsegmented. The SEHI  
and SEH automatically partition problem segments, and reconnect  
non-problem segments to the network.  
En a ble P or t  
This command lets you enable the selected port.  
Disa ble P or t  
This command lets you Disable the selected port.  
Up d a te-F r eq  
This command lets you select the time interval between Stack/Module/  
Port counter updates. You can choose update intervals in increments  
of 3 seconds, with the Maximum interval being 99 seconds.  
Mod u le  
This command lets you view statistics for a selected module in the  
stack. The SEHI is Module 1 and each SEH in the stack follows in  
sequential order. Figure 6-9 shows each module number in the stack.  
SEH - MODULE 5  
SEH - MODULE 4  
SEH - MODULE 3  
SEH - MODULE 2  
SEHI - MODULE 1  
Figure 6-9. Module Number Sequence  
P or t  
This command lets you view port statistics for ports 1-26 of the  
selected module.  
Page 6-24  
 
LOCAL MANAGEMENT  
Selectin g th e Ap p r op r ia te Mod u le/P or t  
When the Device Statistics screen first appears, statistics are  
displayed for Module 1 and Port 1. To view statistics for another  
module and port, use the Mod u le x or Por t x commands at the  
bottom of the screen.  
To select a module or port:  
1. Use the arrow keys to highlight the Module or Port command.  
2. Press the sh ift and + keys, or the - key until the desired module or  
port number appears.  
3. Press the Retu r n key. Statistics associated with the selected  
Module and Port appear.  
Usin g th e En a ble P or t Com m a n d  
The Enable Port command lets you enable the port selected in the Port  
command. You must first use the Port command to select the desired  
port.  
To set the Port Enable command:  
1. Use the arrow keys to highlight the En a ble P or t command at the  
bottom of the screen.  
2. Press the Retu r n key. The corresponding port is enabled and the  
Port Admin Status field is updated.  
Page 6-25  
 
LOCAL MANAGEMENT  
Usin g th e Disa ble P or t Com m a n d  
The Disable Port command lets you Disable the port selected in the  
Port command. You must first use the Port command to select the  
desired port.  
To set the Port Disable command:  
1. Use the arrow keys to highlight the Disa ble P or t command at the  
bottom of the screen.  
2. Press the Retu r n key. The corresponding port is enabled and the  
Port Admin Status field is updated.  
Exitin g th e Device Sta tistics Scr een  
To exit the Device Statistics screen:  
1. Use the arrow keys to highlight the RETURN command at the  
bottom of the screen.  
2. Press the Retu r n key. The Feature Selection screen appears.  
Page 6-26  
 
TWISTED PAIR WIRING TABLES  
AP P ENDIX A  
TWISTED PAIR WIRING TABLES  
This appendix contains twisted pair wiring tables which will assist  
you if you are using a Punch Down Block (see Figure A-1) to wire your  
twisted pair segments. The following tables are included in this  
appendix:  
Table A-1  
Table A-2  
Table A-3  
Twisted Pair Wiring from an SEH to a Punch Down  
Block  
Twisted Pair Wiring from a Punch Down Block to a  
10BASE-T Device  
Twisted Pair Wiring Summary  
Page A-1  
 
TWISTED PAIR WIRING TABLES  
Note: Pins 25 and 50 on Champ connector are not used.  
Table A-1. Twisted Pair Wiring  
from an SEHI-32/34 to a Punch Down Block  
Fr om  
SEHI-32/34  
In to a n d Ou t of 50  
P in Feed er Ca ble  
In to P u n ch Dow n  
Block  
Port 12/24  
Pin  
RX+ 48  
RX- 23  
TX+ 49  
TX- 24  
Pin  
Pin  
48 Violet/Green RX+  
23 Green/Violet RX-  
49 Violet/Brown TX+  
24 Brown/Violet TX-  
A45 Violet/Green RX+  
A46 Green/Violet RX-  
A47 Violet/Brown TX+  
A48 Brown/Violet TX-  
Port 11/23  
Pin  
RX+ 46  
RX- 21  
TX+ 47  
TX- 22  
Pin  
Pin  
46 Violet/Blue  
21 Blue/Violet  
RX+  
RX-  
A41 Violet/Blue  
A42 Blue/Violet  
RX+  
RX-  
47 Violet/Orange TX+  
22 Orange/Violet TX-  
A43 Violet/Orange TX+  
A44 Orange/Violet TX-  
Port 10/22  
Pin  
RX+ 44  
RX- 19  
TX+ 45  
TX- 20  
Pin  
Pin  
44 Yellow/Brown RX+  
19 Brown/Yellow RX-  
45 Yellow/Gray TX+  
20 Gray/Yellow TX-  
A37 Yellow/Brown RX+  
A38 Brown/Yellow RX-  
A39 Yellow/Gray TX+  
A40 Gray/Yellow TX-  
Port 9/21  
Pin  
RX+ 42  
RX- 17  
TX+ 43  
TX- 18  
Pin  
Pin  
42 Yellow/Orange RX+  
17 Orange/Yellow RX-  
43 Yellow/Green TX+  
18 Green/Yellow TX-  
A33 Yellow/Orange RX+  
A34 Orange/Yellow RX-  
A35 Yellow/Green TX+  
A36 Green/Yellow TX-  
Page A-2  
 
TWISTED PAIR WIRING TABLES  
Table A-1. Twisted Pair Wiring  
from an SEHI-32/34 to a Punch Down Block (Continued)  
Fr om  
SEHI-32/34  
In to a n d Ou t of 50  
P in Feed er Ca ble  
In to P u n ch Dow n  
Block  
Port 8/20  
Pin  
RX+ 40  
RX- 15  
TX+ 41  
TX- 16  
Pin  
Pin  
40 Black/Gray  
15 Gray/Black  
RX+  
RX-  
A29 Black/Gray RX+  
A30 Gray/Black RX-  
A31 Yellow/Blue TX+  
A32 Blue/Yellow TX-  
41 Yellow/Blue TX+  
16 Blue/Yellow TX-  
Port 7/19  
Pin  
RX+ 38  
RX- 13  
TX+ 39  
TX- 14  
Pin  
Pin  
38 Black/Green RX+  
13 Green/Black RX-  
39 Black/Brown TX+  
14 Brown/Black TX-  
A25 Black/Green RX+  
A26 Green/Black RX-  
A27 Black/Brown TX+  
A28 Brown/Black TX-  
Port 6/18  
Pin  
RX+ 36  
RX- 11  
TX+ 37  
TX- 12  
Pin  
Pin  
36 Black/Blue  
11 Blue/Black  
RX+  
RX-  
A21 Black/Blue RX+  
A22 Blue/Black RX-  
A23 Black/Orange TX+  
A24 Orange/Black TX-  
37 Black/Orange TX+  
12 Orange/Black TX-  
Port 5/17  
Pin  
Pin  
Pin  
RX+ 34  
34 Red/Brown  
9 Brown/Red  
RX+  
RX-  
TX+  
TX-  
A17 Red/Brown RX+  
A18 Brown/Red RX-  
RX-  
9
TX+ 35  
TX- 10  
35 Red/Gray  
10 Gray/Red  
A19 Red/Gray  
A20 Gray/Red  
TX+  
TX-  
Page A-3  
 
TWISTED PAIR WIRING TABLES  
Table A-1. Twisted Pair Wiring  
from an SEHI-32/34 to a Punch Down Block (Continued)  
Fr om  
SEHI-32/34  
In to a n d Ou t of 50  
P in Feed er Ca ble  
In to P u n ch Dow n  
Block  
Port 4/16  
Pin  
Pin  
Pin  
RX+ 32  
32 Red/Orange RX+  
A13 Red/Orange RX+  
A14 Orange/Red RX-  
RX-  
7
7
Orange/Red RX-  
TX+ 33  
33 Red/Green  
TX+  
TX-  
A15 Red/Green  
A16 Green/Red  
TX+  
TX  
TX-  
8
8
Green/Red  
Port 3/15  
Pin  
5
Pin  
Pin  
RX+ 30  
30 White/Gray RX+  
5 Gray/White RX-  
A9 White/Gray RX+  
A10 Gray/White RX-  
RX-  
TX+ 31  
31 Red/Blue  
TX+  
TX-  
A11 Red/Blue  
A12 Blue/Red  
TX+  
TX-  
TX-  
6
6
Blue/Red  
Port 2/14  
Pin  
Pin  
Pin  
RX+ 28  
RX-  
TX+ 29  
28 White/Green RX+  
Green/White RX-  
29 White/Brown TX+  
A5 White/Green RX+  
A6 Green/White RX-  
A7 White/Brown TX+  
A8 Brown/White TX-  
3
3
TX-  
4
4
Brown/White TX-  
Port 1/13  
Pin  
Pin  
Pin  
RX+ 26  
RX-  
TX+ 27  
26 White/Blue  
1 Blue/White  
RX+  
RX-  
A1 White/Blue RX+  
A2 Blue/White RX-  
A3 White/OrangeTX+  
A4 Orange/WhiteTX-  
1
27 White/Orange TX+  
2 Orange/White TX-  
TX-  
2
Page A-4  
 
TWISTED PAIR WIRING TABLES  
Table A-2. Twisted Pair Wiring  
from a Punch Down Block to a 10Base-T Device  
Fr om P u n ch Dow n  
Block  
To RJ -45  
Wa llp la te Office  
Dr op  
In to  
In to  
10BASE-T  
Device  
Port 12/24  
Pin  
Pin  
Pin  
B45 Violet/Green  
B46 Green/Violet  
B47 Violet/Brown  
B48 Brown/Violet  
RX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
RX-  
TX+  
TX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
Port 11/23  
Pin  
Pin  
Pin  
B41 Violet/Blue  
B42 Blue/Violet  
RX+  
RX-  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
B43 Violet/Orange TX+  
B44 Orange/Violet TX-  
Port 10/22  
Pin  
Pin  
Pin  
B37 Yellow/Brown  
B38 Brown/Yellow  
B39 Yellow/Gray  
B40 Gray/Yellow  
RX+  
RX-  
TX+  
TX-  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
Port 9/21  
Pin  
Pin  
Pin  
B33 Yellow/Orange RX+  
B34 Orange/Yellow RX-  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
B35 Yellow/Green  
B36 Green/Yellow  
TX+  
TX-  
Page A-5  
 
TWISTED PAIR WIRING TABLES  
Table A-2. Twisted Pair Wiring  
from a Punch Down Block to a 10Base-T Device (Continued)  
Fr om P u n ch Dow n  
Block  
To RJ -45  
Wa llp la te Office  
Dr op  
In to  
In to  
10BASE-T  
Device  
Port 8/20  
Pin  
Pin  
Pin  
B29 Black/Gray  
B30 Gray/Black  
B31 Yellow/Blue  
B32 Blue/Yellow  
RX+  
1
2
3
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
RX-  
TX+  
TX-  
TX-  
TX-  
RX+  
RX-  
RX+  
6RX-  
Port 7/19  
Pin  
Pin  
Pin  
B25 Black/Green  
B26 Green/Black  
B27 Black/Brown  
B28 Brown/Black  
RX+  
RX-  
TX+  
TX-  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
Port 6/18  
Pin  
Pin  
Pin  
B21 Black/Blue  
B22 Blue/Black  
B23 Black/Orange  
B24 Orange/Black  
RX+  
RX-  
TX+  
TX-  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
Port 5/17  
Pin  
Pin  
Pin  
B17 Red/Brown  
B18 Brown/Red  
B19 Red/Gray  
B20 Gray/Red  
RX+  
RX-  
TX+  
TX-  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
Page A-6  
 
TWISTED PAIR WIRING TABLES  
Table A-2. Twisted Pair Wiring  
from a Punch Down Block to a 10Base-T Device (Continued)  
Fr om P u n ch Dow n  
Block  
To RJ -45  
Wa llp la te Office  
Dr op  
In to  
In to  
10BASE-T  
Device  
Port 4/16  
Pin  
Pin  
Pin  
B13 Red/Orange  
B14 Orange/Red  
B15 Red/Green  
B16 Green/Red  
RX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
2
6
TX+  
TX-  
TX-  
RX-  
RX-  
TX+  
TX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
Port 3/15  
Pin  
Pin  
Pin  
B9 White/Gray  
B10 Gray/White  
B11 Red/Blue  
B12 Blue/Red  
RX+  
RX-  
TX+  
TX-  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
Port 2/14  
Pin  
Pin  
Pin  
B5 White/Green  
B6 Green/White  
B7 White/Brown  
B8 Brown/White  
RX+  
RX-  
TX+  
TX-  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
Port 1/13  
Pin  
Pin  
Pin  
B1 White/Blue  
B2 Blue/White  
RX+  
RX-  
1
2
3
6
TX+  
1
2
3
6
TX+  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
TX-  
RX+  
RX-  
B3 White/Orange TX+  
B4 Orange/White TX-  
Page A-7  
 
TWISTED PAIR WIRING TABLES  
Table A-3. Twisted Pair Wiring Summary  
SEHI-32/34  
Ch a m p  
P u n ch  
Dow n Block  
Wa ll P la te  
(If Requ ir ed ) Eth er n et  
Device  
10BASE-T  
Port 12  
48 RX+  
23 RX-  
A45 RX+  
A46 RX-  
PIN 1 TX+  
{
PIN 1 TX+  
PIN 2 TX-  
{
{
4 Pair  
Twisted  
Distribution  
Cable  
PIN 2 TX-  
25 Pin  
Feeder  
Cable  
Office  
Drop  
{
{
{
49 TX+  
24 TX-  
A47 TX+  
A48 TX-  
PIN 3 RX+  
PIN 6 RX+  
PIN 3 RX+  
PIN 6 RX+  
Port 11  
46 RX+  
21 RX-  
A41 RX+  
A42 RX-  
PIN 1 TX+  
PIN 2 TX-  
PIN 1 TX+  
PIN 2 TX-  
{
{
{
4 Pair  
Twisted  
25 Pin  
Feeder  
Office  
Drop  
{
{
Distribution  
Cable  
47 TX+  
22 TX-  
A43 TX+  
A44 TX-  
{
PIN 3 RX+  
PIN 6 RX-  
PIN 3 RX+  
PIN 6 RX-  
Cable  
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
Port 1  
26 RX+  
A1 RX+  
A2 RX-  
PIN 1 TX+  
{
PIN 1 TX+  
PIN 2 TX-  
4 Pair  
Twisted  
{
{
1
RX-  
PIN 2 TX-  
25 Pin  
Feeder  
Office  
Drop  
{
Distribution  
{
Cable  
{
27 TX+  
TX-  
A3 TX+  
A4 TX-  
PIN 3 RX+  
PIN 6 RX-  
PIN 3 RX+  
PIN 6 RX-  
Cable  
2
Page A-8  
 
TWISTED PAIR WIRING TABLES  
A
B
C
D
1
2
3
4
5
6
7
8
9
1 0  
1 1  
1 2  
1 3  
1 4  
1 5  
1 6  
1 7  
1 8  
1 9  
2 0  
2 1  
2 2  
2 3  
2 4  
2 5  
2 6  
2 7  
2 8  
2 9  
3 0  
3 1  
3 2  
3 3  
3 4  
3 5  
3 6  
3 7  
3 8  
3 9  
4 0  
4 1  
4 2  
4 3  
4 4  
4 5  
4 6  
4 7  
4 8  
4 9  
5 0  
Figure A-1. Punch Down Block  
Page A-9  
 
P OWER SUP P LY CORD  
The mains cord used with this equipment must be a 2 conductor plus  
ground type with minimum 0.75 mm square conductors and must  
incorporate a standard IEC appliance coupler on one end and a mains  
plug on the other end which is suitable for the use and application of  
the product and that is approved for use in the country of application.  
GERMAN:  
Die Netzleitung, die mit diesem Geraet benuetzt wird, soll einen zwei  
Leiter mit Erdleiter haben, wobei die Leiter mindestens 0.75 mm sind,  
mit einer normalen IEC Geraetesteckdose an einem Ende und einem  
Geraetestecker am anderen Ende versehen sind, der fuer den  
Gebrauch und die Anwendung des Geraetes geeignet und der zum  
Benuetzen im Lande der Anwendung anerkannt ist.  
SP ANISH:  
El cable principal de la red eléctrica utilizado con este equipo debe  
tener 2 conductores y 1 toma de tierra con un mínimo de 0.75 mm2  
cada uno y necesita tener un aparato de acoplamiento standard IEC en  
un extremo y un enchufe para el cable principal de la red eléctrica en  
el otro extremo, lo cual sea adecuado para el uso y  
applicación del producto y lo cual sea aprobado para uso en el pais de  
applicación.  
F RENCH:  
Le cordon d' alimentation reliant cet appareil au secteur doit  
obligatoirement avoir deux fils conducteurs de 0.75 mm2 minimum et  
un fil de terre. It doit également être équipé du côté appareil d'une  
fiche agrée IEC et du côte secteur, d'une prise adaptée à l'usage du  
produit et aux normes du pays où l'appareil est utilisé.  
 

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