Compaq Netelligent 2524, Netelligent 2624, Netelligent 3512, Netelligent 3612 User Manual

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Writer: IM Project: Front Notice Comments: 283318-001
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NOTICE

The information in this publication is subject to change without notice.
COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR

EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN, NOR FOR INCIDENTAL OR
CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE, OR
USE OF THIS MATERIAL.

This publication contains information protected by copyright. No part of this publication may be
photocopied or reproduced in any form without prior written consent from Compaq Computer
Corporation.

The software described in this guide is furnished under a license agreement or non-disclosure agreement.
The software may be used or copied only in accordance with the terms of the agreement.

Product names mentioned herein may be trademarks and/or registered trademarks of their respective
companies.



1996 Compaq Computer Corporation.

All rights reserved. Printed in the U.S.A.

Compaq

Registered United States Patent and Trademark Office.

Netelligent is a trademark of Compaq Computer Corporation.

Compaq Netelligent 2524/2624 and 3512/3612 100Base-T Repeater

User Guide

First Edition (December 1996)

Part Number 283318-001

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v

Compaq Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

Writer: IM Project: Federal Communications Commission Notice Comments: 283318-001

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Federal Communications Commission Notice

Part 15 of the Federal Communications Commission (FCC) Rules and Regulations has established Radio
Frequency (RF) emission limits to provide an interference-free radio frequency spectrum. Many
electronic devices, including computers, generate RF energy incidental to their intended function and are,
therefore, covered by these rules. These rules place computers and related peripheral devices into two
classes, A and B, depending upon their intended installation. Class A devices are those that may
reasonably be expected to be installed in a business or commercial environment. Class B devices are
those that may reasonably be expected to be installed in a residential environment (i.e., personal
computers). The FCC requires devices in both classes to bear a label indicating the interference potential
of the device as well as additional operating instructions for the user.

The rating label on the device shows which class (A or B) the equipment falls into. Class B devices have
an FCC ID on the label. Class A devices do not have an FCC ID on the label. Once the class of the device
is determined, refer to the following corresponding statement.

NOTE:

If this equipment contains a Token Ring interface, this equipment is a

Class A digital device when the Token Ring interface is utilized.

Class A Equipment

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 generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case the user will be required to correct
the interference at personal expense.

Canadian Notice

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment
Regulations.

Avis Canadien

Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel
brouilleur du Canada.

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vi Federal Communications Commission Notice

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Modifications

The FCC requires the user to be notified that any changes or modifications made to this device that are
not expressly approved by Compaq Computer Corporation may void the user's authority to operate the
equipment.

Cables

Connections to this device must be made with shielded cables with metallic RFI/EMI connector hoods in
order to maintain compliance with FCC Rules and Regulations.

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Compaq Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

Writer: IM Project: Federal Communications Commission Notice Comments: 283318-001

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European Union (EU) Notice

Products with the CE Marking comply with both the EMC Directive (89/336/EEC) and the Low Voltage
Directive (73/23/EEC) issued by the Commission of the European Community.

Compliance with these directives implies conformity to the following European Norms (in brackets are
the equivalent international standards):

■

EN55022 (CISPR 22) - Electromagnetic Interference

■

EN50082-1 (IEC801-2, IEC801-3, IEC801-4) - Electromagnetic
Immunity

■

UL 1950, Second Edition; CAN/CSA C22.2 No. 950-93; TUV
Rheinland EN 60950; and 1988 + A1/1990+A2/1991 - Product Safety

Japanese Notice

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viii Federal Communications Commission Notice

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Fiber Port Class 1 Classification

Compaq fiber ports have been tested in accordance with the IEC 825-1 test standard and found to meet
the Class 1, intrinsically eye-safe emitter classification.

Product Label

CLASS 1 LED

KLASSE 1 LED

The fiber ports on this product have been tested in accordance with the
IEC 825-1 Test Standard and found to meet the Class 1, intrinsically
eye-safe emitter classification.

.

Lithium Battery

The non-volatile RAM (NVRAM) chip on the motherboard of the Netelligent 2524/2624 100Base-T
repeater contains a non-replaceable lithium battery. Only trained service personnel should dispose of this
chip.

La puce mémoire non volatile contient une pile au lithium non remplaçable. L'élimination de cette puce
devrait être confieé à un personnel qualifié.

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ix

Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

Writer: Liz Fischer Project: Table of Contents Comments: 283318-001

File Name:2636_t.doc Last Saved On:12/5/96 3:37 PM

Contents

Chapter 1

Overview

Features........................................................................................................................1-1

Package Contents.........................................................................................................1-3

Repeater Components ..................................................................................................1-5

LED Indicators......................................................................................................1-7

Model 2524/2624 LEDs....................................................................................1-7

Model 3512/3612 LEDs....................................................................................1-7

RJ-45 Ports............................................................................................................1-9

Smart Uplink Port (2624 and 3612 Repeaters).....................................................1-9

Serial COM Port (2624 and 3612 Repeaters) ....................................................1-10

Power Supply......................................................................................................1-11

Expansion Interface.............................................................................................1-11

Dip Switches (2524 and 3612 Repeaters)..........................................................1-12

Model 2524 Dip Switches...............................................................................1-12

Model 3612 Dip Switches...............................................................................1-12

Migrating from 10Base-T to Fast Ethernet ...............................................................1-12

Fast Ethernet Repeater Management..........................................................................1-14

100Base-T Repeater Expansion.................................................................................1-15

Expanding 2524 and 2624 Repeaters..............................................................1-15

Expanding 3512 and 3612 Repeaters..............................................................1-15

Extending Your Network with Smart Uplink Modules .....................................1-17

Smart Uplink Configuration Examples...............................................................1-18

Smart Uplink Configuration 1 (Models 2524/2624)...........................................1-19

Smart Uplink Configuration 2 (Models 2524/2624)...........................................1-20

Smart Uplink Configuration 3 (Model 3612) .....................................................1-21

Smart Uplink Configuration 3 (Model 3612) .....................................................1-21

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Smart Uplink Configuration 4 (Model 2624)..................................................1-22

Smart Uplink Configuration 5 (Model 3612)..................................................1-23

Chapter 2

Planning Repeater Installation

Optional Hardware.......................................................................................................2-1

Installation Requirements.............................................................................................2-1

Environmental Requirements................................................................................2-1

Electrical Requirements........................................................................................2-2

Spatial Requirements ............................................................................................2-2

Cable Requirements .....................................................................................................2-3

Understanding Fast Ethernet Cable Budgets.........................................................2-3

Checking Your Cable Budget...............................................................................2-4

Cable Types and Distance Limitations .................................................................2-5

Smart Uplink Port Cable.......................................................................................2-8

Modem Cable........................................................................................................2-8

System Planning Charts ...............................................................................................2-9

Chapter 3

Installing the Repeater

Mounting the Repeater.................................................................................................3-1

Attaching the Rubber Feet ....................................................................................3-1

Rack-Mounting the Repeater ................................................................................3-1

Installing a Smart Uplink Module................................................................................3-3

Inserting the Smart Uplink Module into a 2624/3612 Repeater ...........................3-3

Connecting Twisted-Pair Cable ...................................................................................3-5

Interconnecting Repeaters............................................................................................3-5

Interconnecting 2524/2624 Repeaters...................................................................3-6

2524 Dip Switch Settings..................................................................................3-6

HOST/TARGET............................................................................................3-7

Invalid Connections................................................................................. 3-8

MAN/UNM....................................................................................................3-8

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Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

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Interconnecting 3512/3612 Repeaters.................................................................3-10

Connecting Power......................................................................................................3-11

Disconnecting Power ..........................................................................................3-12

Chapter 4

Repeater Management

Supported MIBs...........................................................................................................4-1

Supported Frame Types ...............................................................................................4-1

NVRAM.......................................................................................................................4-2

SNMP Management.....................................................................................................4-2

IP Support .............................................................................................................4-2

IP Autodiscovery Support.....................................................................................4-3

IPX Support ..........................................................................................................4-3

Configuring the Repeater at Bootup.............................................................................4-4

Using the VT100 Serial Port/Telnet Management Interface........................................4-5

Setting up the Terminal Emulation Program ........................................................4-6

Starting the Management Session.........................................................................4-7

Error Messages..................................................................................................4-8

Navigating Menu Option Screens.........................................................................4-9

Viewing System Information..............................................................................4-10

Viewing the Stack Configuration (Model 3612).................................................4-11

Viewing the Backup Port Configuration.............................................................4-12

Adding a Backup Port Entry ...........................................................................4-12

Deleting a Backup Port Entry..........................................................................4-13

Updating the State of a Backup Port Entry .....................................................4-13

Error Messages................................................................................................4-14

Viewing Port Statistics........................................................................................4-15

Viewing Port Group Statistics.............................................................................4-16

Changing Your Password....................................................................................4-18

Error Messages................................................................................................4-18

Downloading Firmware ......................................................................................4-19

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Error Messages................................................................................................4-20

Setting Up the Modem........................................................................................4-21

Logging Out of the Management Session...........................................................4-22

RMON Support (Model 3612)...................................................................................4-23

Statistics Group...................................................................................................4-23

History Group .....................................................................................................4-23

Alarm Group.......................................................................................................4-24

Event Group........................................................................................................4-24

Intrusion Protection (Model 3612).............................................................................4-25

Changing the Status of a Port..............................................................................4-25

Security...............................................................................................................4-26

Appendix A

Specifications

Physical.......................................................................................................................A-1

Electrical ..................................................................................................................... A-1

Environmental.............................................................................................................A-2

Appendix B

Internal DIP Switch (Models 3512/3612)

Appendix C

Upgrading the DRAM (Model 3612)

Installing a SIMM ....................................................................................................... C-1

Appendix D

Electrostatic Discharge

Glossary

Index

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xiii

Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

Writer: Liz Fischer Project: Preface Comments: 283318-001

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Preface

This guide contains information about how to install, operate, and manage the
Compaq Netelligent 2524/2624 and 3512/3612 100Base-T repeaters. We
recommend that you read all chapters in this guide to become familiar with the
repeater's features and to ensure a successful installation.

Intended Reader

This guide is written for network administrators and technicians responsible for
hardware installation.

Chapter Organization

The contents of this guide are organized as follows:
Chapter 1  Provides an overview of the repeater and describes the repeater's

features and components.
Chapter 2  Helps you plan the installation of the repeater. It includes all

repeater installation requirements as well as charts for planning the repeater
setup and rack inventory.

Chapter 3  Provides instructions for installing the repeater and a Smart
Uplink Module (SUM), and interconnecting repeaters.

Chapter 4  Provides information about in-band and out-of-band repeater
management, including SNMP, Telnet, and the VT100 console interface.

Appendix A  Includes the repeater's physical, electrical, and environmental
specifications.

Appendix B  Describes precautions to avoid electrostatic discharge that can
harm the repeater.

Appendix C  Provides instructions for installing additional DRAM, which
allows the repeater to collect a larger number of RMON (3612 model) statistics.

The Glossary  Provides definitions for terms related to repeaters, as well as
general networking terms.

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1-1

Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

Writer: Chris Seiter/Liz Fischer Project: Chapter 1 Comments: 283318-001

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Chapter 1

Overview

Compaq Netelligent 2524, 2624, 3512, and 3612 100Base-T repeaters are
designed to bring reliable 100 Mb/s performance to your desktop. Compaq
Smart Uplink technology lets you interconnect managing versions of these
repeaters (Models 2624 and 3612) to increase the diameter of your network
beyond the normal limitations set by 100Base-T Class 1 specifications. You can
also integrate the repeater into your existing 10Base-T network using a switch,
bridge, or router. These repeaters offer a wide array of features for a versatile,
low-cost stackable repeater solution.

These Netelligent repeaters are available in the following models:

■

Netelligent 2524 — 24-port unmanaged 100Base-TX repeater
(Part Number 267001-001)

■

Netelligent 2624 — 24-port managing 100Base-TX repeater
(Part Number 267000-001)

■

Model 3512 — 12-port unmanaged 100Base-TX repeater
(Part No. 267008-001)

■

Model 3612 — 12-port managing 100Base-TX repeater
(Part No. 267007-001)

Features

These Netelligent repeaters provide these features:

■

24 RJ-45 ports for 2524/2624; 12 RJ-45 ports for 3512/3612

■

One Smart Uplink slot for a Smart Uplink module (SUM) and one
console port for Telnet and TFTP (Models 2624 and 3612 only)

■

24 bi-colored LED indicators (12 for Models 3512 and 3612) show port
activity, port link, and port disable/auto partition; other LEDs show
collisions, the power supply status, and the management status of the
repeater

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■

Smart Uplink capability extends the distance between repeaters to up to
100 meters/328 feet (or 412 meters/1352 feet with fiber). This allows
integration of multiple 100 Mb/s repeaters into an existing 100Base-T
configuration without normal repeater hop limitations.

■

TX, FX (ST), and FX (SC) Smart Uplink modules available

■

Four-group RMON (Remote MONitor) support allows remote diagnostic
monitoring via the network management system (Model 3612 only)

■

Fast Ethernet wiring standards ensure compatibility with all types of
UTP cabling

■

2524/2624 repeaters are stackable up to three units high (as long as the
stack contains a 2624 model), providing up to 72 workstation
connections. The 3512/3612 repeaters are stackable up to five units high
(as long as the stack contains a 3612 model), providing up to 60
workstation connections.

■

2524/2624 repeaters allow one backplane segment per stack, connected
via a backplane connection cable (Part No. 283305-001).

■

3512/3612 repeaters are segmentable on a per-unit basis; or, by
interconnecting repeaters with a FlexPlane backplane connection cable
(Part No. 810172-000), all repeaters in a stack can share up to three
common backplane segments.

■

Host/target design allows unmanaged repeaters (Models 2524 or 3512)
to be managed by a single managing repeater (Models 2624 or 3612).

■

2524 and 2624 repeaters provide an internal 110W power supply. 3512
and 3612 repeaters provide redundant hot-swappable load-sharing power
supply (90W) capability .

■

Compaq Netelligent Management Software is included free of charge
(2624 and 3612 managing units).

■

Port intrusion and security support (Model 3612 only)

■

Rack-mountable chassis

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1-3

Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

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Package Contents

Before you start to install the repeater, verify that the package contains the
following items:

■

Netelligent 2524, 2624, 3512, or 3612 100Base-T repeater

■

Shielded AC power cord

■

Rack-mount kit (two side-mounting brackets, eight 3/8-inch bracket
screws, and four 1/2-inch rack mount screws)

■

Four adhesive-backed rubber feet

■

Compaq Netelligent 2524/2624 and 3512/3612 100Base-T Repeater
User Guide

■

Compaq Netelligent Management Software CD (with 2624 and 3612
repeaters)

■

Limited warranty information

The package may contain the following optional items, ordered separately:

■

Backplane connection cable (for Models 2524 and 2624) or FlexPlane
backplane connection cable (for Models 3512 and 3612)

■

Smart Uplink modules

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1-4 Overview

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Rack-Mounting Brackets

(2624 Only)

(3612 Only)

(2624 Only)

1/2-inch Rack Mount Screws (4)

3/8-inch Bracket Screws (8)

Power Cord

Rubber Feet (4)

COM PORT

COL
PWR

HUB STATUS

1 2 3 4 5 6 7 9 10 11 128

13 14 15 16 17 18 19 21 22 23 2420

2524/2624 100Base-T Class I Repeater

3512/3612 100Base-T Class I Repeater

PWR A

BP3

BP2

BP1

COL

PWR B

STATUS

COM PORT

1234567 91011128

XXXXXXXXXXXX

Limited Warranty

Netelligent 2524/2624

and 3512/3612

100Base-T Repeater

User Guide

User Guide

Smart Uplink Modules

Limited Warranty

COLLISION

ACTIVITY

SMARTUP-TX

100BASE-TX

COLLISION

ACTIVITY

TX RX

SMARTUP-FX

100BASE-FX

COLLISION

ACTIVITY

SMARTUP-FXSC

100BASE-FX

100Base-FX (ST)

100Base-FX (SC)

Optional Parts, Ordered Separately

100Base-TX

68-pin

Connectors

2524/2624 Backplane

Connection Cable
(P/N 283305-001)

Compaq Netelligent

Management Software CD

(For 2624 and 3612 Repeaters)

Netelligent

Management

Software

3512/3612 FlexPlane
Backplane Connector

Figure 1-1. Package Contents

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1-5

Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

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Repeater Components

This section provides a summary of the repeater's components. Figures 1-2 and
1-3 show the repeaters’ front and back panels:

COM PORT

COL

PWR

HUB STATUS

1234 567 91011128

13 14 15 16 17 18 19 21 22 23 2420

2524/2624 100Base-T Class I Repeater

3512/3612 100Base-T Class I Repeater

Smart Uplink Module Port

(Model 2624 only)

Collision, Power Supply,

and Status LEDs

Serial COM Port

(for out-of-band management

and firmware upgrades,

Model 2624 only)

RJ-45 Ports

and Link Status LEDs

PWR A

BP3

BP2

BP1

COL

PWR B

MGMT STATUS

COM PORT

1

23456 7 91011128

XXXXXXXXXXXX

Serial COM Port

(for out-of-band management

and firmware upgrade —

Model 3612 only)

RJ-45 Ports and LEDs

Power Supply A, Power Supply B,

and Status LEDs

Collision, Backplane 1,

Backplane 2, and Backplane 3

LEDs

Smart Uplink Module Slot

Figure 1-2.

Repeater Front Panels

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1-6 Overview

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EXPN PORT BEXPN PORT A

UNM
HOST

TARGET

MAN

68-Pin Backplane Connectors

2624 Repeater Back Panel

2524 Repeater Back Panel

3512/3612 Repeater Back Panel

DIP Switch

Factory Default Settings

TARGET/MAN

PWR A

PWR B

UP

DOWN

Main Power Supply Redundant Power Supply Hub Expansion Ports

Figure 1-3. Repeater Back Panels

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Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

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LED Indicators

The repeater has several LED indicators to help you monitor and manage the
repeater. Table 1-1 describes the repeater LEDs.

Model 2524/2624 LEDs

The LEDs on the left side of the front panel indicate the collision status, power
supply, and general status of the repeater. The LEDs above each RJ-45 port
indicate activity on those ports. When you power on a managing 2624 repeater,
it performs a power-on self test (POST). The POST lasts approximately 1
minute. After the POST, all LEDs automatically change to their operational
modes.

Model 3512/3612 LEDs

The LEDs on the left side of the front panel indicate the status of both power
supplies (PWR A/main and PWR B/redundant) and the general repeater status.
The LEDs on the right side of the front panel show the collision status of the
repeater and the current backplane selection (1, 2, or 3). The LEDs above each
RJ-45 port indicates activity on those ports.

When you power on the managing 3612 repeater, it performs a power-on self
test (POST). The POST lasts approximately 1 minute, depending on the amount
of DRAM installed in the repeater (see Appendix C “Upgrading the DRAM”).
After the POST, all LEDs automatically change to their operational modes.

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1-8 Overview

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Table 1-1

LED Operations and Descriptions (All Models)

LED Status and Meaning

COL (Collision)

Flashing Yellow

 Global collisions are occurring anywhere in the repeater's collision domain

OFF  No collisions are occurring

RJ-45 Ports

Link Status

Solid Green  Successful link test
Flashing Green  Port activity
Solid Yellow  Port has been partitioned/disabled
OFF  Link test failure or no connection to the port.

PWR (Power -

Models 2524

and 2624)

OFF  Power is OFF to the repeater.
Solid Green  Power is ON to the repeater.

PWR A and

PWR B (Power

Supply A/B ­Models 3512

and 3612)

Solid Green  Power supply installed and operating properly

Solid Yellow  Power supply installed but not operating properly
Off  Power supply not installed

HUB STATUS

(Models 2524

and 2624)

Unmanaged Repeater (Model 2524)

OFF  The repeater is not currently managed; waiting for the 2624 to start.
Solid Green  The repeater is currently managed.
Solid Yellow  The repeater is isolated from the backplane or is not in a stack. In a two-repeater

2524/2524 (unmanaged) stack, you have set both repeater dip switches to TARGET or to HOST. In this
stack, set one dip switch to TARGET and the other to HOST.
Flashing Green  The 2524 repeater dip switch is set to UNM, which overrides the non-volatile port
enables from the 2624 managing repeater. Reset the 2524 dip switch to MAN.

Managing Repeater (Model 2624)

OFF  Basic firmware failure preventing the firmware from functioning correctly
Solid Green  The repeater successfully finished POST and is ready to manage.
Solid Yellow  The repeater is booting up and is not ready to manage.
Flashing Yellow  The POST failed.
Flashing Green  In a stack with one 2624 managing repeater and one or more 2524 repeaters, you

have set a 2524 repeater dip switch(es) to UNM. This setting overrides the non-volatile port enables
from the 2624 managing repeater. Reset the 2524 dip switch(es) to MAN.

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1-9

Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

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Table 1-1, continued

STATUS

(Models 3512

and 3612)

Managing Repeater (Model 3612):

Off  The repeater is not currently managed by a managing repeater.
Solid Green  The repeater is currently managed by a managing repeater.
Solid Yellow  The repeater is currently managed by a managing repeater and has the hardware

override switch enabled. See Appendix B, “Internal Dip Switch.”

Unmanaged Repeater (Model 3512):

Off  Basic firmware failure preventing the firmware from functioning correctly
Solid Yellow  The repeater is booting up and is not ready to manage.
Flashing Yellow  The POST failed.
Solid Green  The repeater successfully finished POST and ready to manage.
Flashing Green  The hardware override switch is enabled and the repeater is ready to manage.

BP1, BP2, or

BP3

(Backplane -

Model 3612)

Green  Shows the currently selected backplane
Off  Shows that the backplane is not currently selected

NOTE: LEDs listed as “Yellow” might appear orange on the front panel.

RJ-45 Ports

The repeater’s RJ-45 ports allow connection to UTP or STP cabling to
workstations and servers in a 100Base-T network.

Smart Uplink Slot (2624, 3512/3612 Models)

The Smart Uplink slot houses a Smart Uplink module (SUM), which serves as a
connection point between repeaters, repeater stacks, and other manufacturers'
100Base-T repeaters or stacks. Smart Uplink modules let you extend your
network without the usual repeater hop limitations inherent with Class I
repeaters. Figure 1-4 shows the Smart Uplink modules.

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COM PORT

COL

PWR

HUB STATUS

1234 567 91011128

13 14 15 16 17 18 19 21 22 23 2420

2524/2624 100Base-T Class I Repeater

3512/3612 100Base-T Class I Repeater

Smart Uplink Module Port

(Model 2624 only)

Collision, Power Supply,

and Status LEDs

Serial COM Port

(for out-of-band management

and firmware upgrades,

Model 2624 only)

RJ-45 Ports

and Link Status LEDs

PWR A

BP3

BP2

BP1

COL

PWR B

MGMT STATUS

COM PORT

1

23456 7 91011128

XXXXXXXXXXXX

Serial COM Port

(for out-of-band management

and firmware upgrade —

Model 3612 only)

RJ-45 Ports and LEDs

Power Supply A, Power Supply B,

and Status LEDs

Collision, Backplane 1,

Backplane 2, and Backplane 3

LEDs

Smart Uplink Module Slot

Figure 1-4. Optional Smart Uplink Modules

Serial COM Port (2624 and 3612 Repeaters)

Managing repeaters (Models 2624 and 3612) contain a serial COM port that
uses a DB9 connector with a standard AT pinout. This port lets you perform the
following operations:

■

XMODEM Flash (firmware) downloads

■

VT100 console interface for basic management

■

SLIP (Serial Line Internet Protocol) transfers, including:

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❏

2624 Model - TFTP Flash downloads

❏

3612 Model - Remote (out-of-band) management (Statistics,
History, Alarm, and Event RMON groups) and TFTP Flash
downloads

Power Supply

Netelligent 2524 and 2624 repeaters have an internal 110-watt power supply.
Netelligent 3512 and 3612 repeaters have a single 90-watt power supply (Part

No. 267322-001). If desired, you can purchase another power supply and
operate the repeater in a redundant power supply configuration. The 3512 and
3612 repeaters have two power supply bays on the back panel. The left bay
houses the main power supply (A); the right, the redundant power supply (B).

100-240 VAC, 3A-1.5A,50/60 HZ

Figure 1-5.

90-Watt Power Supply (Models 3512/3612)

PWR A

PWR B

UP

DOWN

Main Power Supply Redundant Power Supply

Figure 1-6.

Power Supply Bays (Models 3512/3612)

Expansion Interface

The back panels of the repeaters have expansion interfaces to interconnect the
repeaters in managed and unmanaged stacks. These are described in the
“100Base-T Repeater Expansion” section in this chapter.

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Dip Switches (Models 2524 and 3512/3612)

The repeaters contain two external (Model 2524) or four internal (Models
3512/3612) dip switches. The functions of these switches, which differ for each
model, are briefly described below. For more information about the 2524 dip
switch settings, see “Dip Switch Settings” in Chapter 3; for information about
the 3512/3612 dip switch settings, see Appendix B.

CAUTION:

Remove power from the repeater before you set the dip switch.

Model 2524

The 2524 repeater back panel has two dip switches. These come factory preset
so that you can connect one or two 2524 repeaters to a 2624 managing repeater
for a three-repeater managed stack of 72 ports. Or, you can reset the dip
switches to interconnect two 2524 repeaters in an unmanaged stack.

Model 3512/3612

The 3512/3612 repeater contains an internal dip switch accessible through the
Power Supply A or B opening on the back of the unit. If management is not
available for the repeater, you can isolate the repeater's collision domain from
the other repeaters in the stack by setting the dip switch. Use the dip switch for
the 3612 repeater only when all other configuration methods are unsuccessful.

Migrating from 10Base-T to
Fast Ethernet

Fast Ethernet (100Base-T) has evolved from standard Ethernet (10Base-T).
Therefore, migrating to Fast Ethernet is fairly simple. Consider the following
three suggestions as you incorporate Fast Ethernet into your network:

■

Purchase dual-speed Network Interface Controllers (NICs) from this
point forward. These NICs operate at 10 Mb/s or 100 Mb/s, so you can
use them with your 10Base-T repeaters now and continue to use them
when you decide to buy 100Base-T equipment.

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■

Verify that any fiber runs you plan to use at 100 Mb/s meet the distance
limitations discussed in the “Cable Requirements” section in Chapter 2,
“Planning Repeater Installation.”

■

Change 100Base-TX repeaters and reconnect the dual-speed NICs to
these repeaters. Interconnect the 10 Mb/s and 100 Mb/s networks using a
server, dual-speed switch, or a router.

Figure 1-7 shows an example of a network configuration that incorporates both
10Base-T and Fast Ethernet equipment, using a 2624 100Base-TX repeater.

Figure 1-7. Integrating Fast Ethernet with 10Base-T

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Fast Ethernet Repeater Management

Netelligent 2624 and 3612 repeaters contain a Management Daughtercard
(MDC100) that provides SNMP management through both in-band and out-of­band communications. The 2624 uses a host/target management architecture.
The 3612 repeater uses a host/target management architecture in conjunction
with the repeater hardware to provide four-group RMON support (Statistics,
History, Alarm, and Event) in a stack of 100Base-T repeaters.

In addition to normal repeater operation, both managing repeaters (2624 and

3612) provide in-band and out-of-band management through a dedicated local
MAC port and the front panel DB9 COM port, described as follows:

■

In-band (or out-of-band via SLIP): SNMP, RMON (Model 3612), Telnet
console, and TFTP download

■

Out-of-band via VT100 interface: Same console as Telnet and firmware
upgrades

You can perform the following operations through the Compaq Netelligent
Management Software or other network management application:

■

Both 2624 and 3612 Models

❏

Enable or disable ports

❏

Monitor port link status, port partition/enable status, and port statistics

■

Model 3612

❏

Select the backplane

❏

Enable port intrusion security

■

Model 2624

❏

Set backup port configuration

NOTE: The repeater retains most configuration settings when powered down and
automatically re-initializes during the power-up cycle.

For more information about the repeater's management capabilities, see
Chapter 4, “Repeater Management.”

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100Base-T Repeater Expansion

Netelligent 2524/2624 and 3512/3612 repeaters have expansion interfaces on
their back panels to allow the interconnection of repeaters within a stack.

Expanding 2524 and 2624 Repeaters

The 2624 repeater has an expansion interface on the repeater's back panel
containing two 68-pin external backplane connectors. These are labeled EXPN
PORT A and EXPN PORT B. The 2524 repeater has one 68-pin external
backplane connector (EXPN PORT) and a dip switch to change from
UNM/HOST or MAN/TARGET.

You can achieve both management and Ethernet expansion by connecting either
EXPN PORT (A or B) of a 2624 repeater to the EXPN PORT of one or two
2524 repeaters using an external backplane connector (Part No. 283305-001).
You can also create an unmanaged stack of two 2524 repeaters using an external
backplane connector between the EXPN PORTs. In this scenario, you must set
the dip switch on one repeater to HOST and the other to TARGET.

Expanding 3512 and 3612 Repeaters

Netelligent 3512 and 3612 repeaters have an expansion interface on the
repeater's back panel that consists of two 100-pin connectors. These are labeled
UP and DOWN. You can achieve both management and Ethernet expansion by
connecting the UP connector of a lower repeater to the DOWN connector of an
upper repeater using a FlexPlane backplane connection cable
(Part No. 810172-000).

A FlexPlane interconnection is shown in Figure 1-8.

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PWR A

PWR B

UP

DOWN

PWR A

PWR B

UP

DOWN

FlexPlane

Connector

100-240 VAC, 3A-1.5A,50/60 HZ

100-240 VAC, 3A-1.5A,50/60 HZ

100-pin Connectors

Figure 1-8. FlexPlane Interconnection

Management Expansion

The FlexPlane connector includes a management bus that enables one managing
repeater to manage all other unmanaged 100Base-T repeaters in a stack. All
internal stack management is out-of-band so that there is no impact on your
network traffic.

Ethernet Expansion

The FlexPlane connector provides three Fast Ethernet backplane segments that
let you segment a stack of repeaters into three vertical collision domains (Figure
1-9). You can also segment repeaters on an individual basis.

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Backplane

Segment

213

100Base-T Repeater Stack

Figure 1-9. Expansion via Three Backplane Segments (3512/3612 Units)

Extending Your Network with
Smart Uplink Modules

A Netelligent Smart Uplink module lets you integrate multiple repeaters into a
100Base-T configuration without the usual repeater hop limitations inherent with
Class I. Smart Uplink modules use a special buffer to isolate collisions between
segments. In effect, this buffer restarts the repeater count and distance
measurement each time a transmission passes through the Smart Uplink module.

A Smart Uplink module is up to 20 times faster than a Fast Ethernet bridge and
up to 200 times faster than an Ethernet bridge. This enhanced speed allows
network transmissions to pass through multiple Smart Uplink modules without
significantly reducing throughput.

Other features of the Smart Uplink module are described below:

■

Supports multiple repeater hops

■

IEEE 802.3u standards compliant (non-proprietary) uplinks to any
available TX, FX (ST), or FX (SC) repeater port

SUM Connector Part Number

TX 267042-001

FX (ST) 267043-001

FX (SC) 267045-001

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■

Supports up to 412 meter (1352 feet) fiber uplinks between stacks when
a Smart Uplink module is used at each end

■

Connection to repeaters in

different

repeater stacks, allowing Ethernet

traffic to all stacks

IMPORTANT: Do not connect a Smart Uplink module to ports in the same stack.
Excessive collisions will occur that will greatly reduce network operations.

The 2624 repeater

cannot

manage repeater stacks that are connected via Smart

Uplink modules.

NOTE: The maximum number of Smart Uplink modules depends on your specific
network application. Neither the 100Base-T repeaters nor the Smart Uplink module
has characteristics that limit the number of Smart Uplink modules that can exist in
a single collision domain.

Smart Uplink Configuration Examples

The following three illustrations show sample network configurations using one
or more Smart Uplink modules installed in 2624 and 3612 repeaters.

■

Configuration 1 (Figure 1-10) shows Smart Uplink modules in a
100Base-FX environment (Model 2524/2624).

■

Configuration 2 (Figure 1-11) shows Smart Uplink modules with
100Base-TX repeaters (Model 2524/2624).

■

Configuration 3 (Figure 1-12) shows SUMs with 100Base-TX and
100Base-T4 repeaters (Model 3612).

■

Configuration 4 (Figure 1-13) shows Smart Uplink modules in a
hierarchical environment (Model 2624).

■

Configuration 5 (Figure 1-14) shows Smart Uplink modules in a
hierarchical environment (Model 3612).

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Smart Uplink Configuration 1
(Models 2524/2624)

Figure 1-10.

Smart Uplink in a 100Base-FX Environment (Model 2624)

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Smart Uplink Configuration 2
(Models 2524/2624)

Figure 1-11.

Smart Uplink with 100Base-TX (Models 2524/ 2624)

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Smart Uplink Configuration 3
(Models 3512/3612)

100 m

100 m

100Base-TX Repeater

100Base-TX Smart Uplink

Module

100Base-TX Smart Uplink

Module

100Base-T4 Smart Uplink

Module

100Base-TX Repeaters

100Base-T4 Repeaters

100Base-TX and 100Base-T4 Repeaters

100 m

100 m

100 m

100 m

100 m

100 m

100 m 100 m

TX Workstation

TX Workstation TX Workstation

T4 WorkstationTX Workstation

TX
TX
TX

TX

T4

T4 Workstation

T4 Workstation

Figure 1-12.

Smart Uplink with 100Base-TX and 100Base-T4 (Models 3512/3612)

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Smart Uplink Configuration 4 (Model 2624)

Figure 1-13.

Smart Uplink in a Hierarchical Environment (Model 2624)

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Smart Uplink Configuration 5
(Models 3512/3612)

100 m

100 m

100 m

100 m

100 m

TX Workstation TX Workstation TX WorkstationTX Workstation

100 m

100 m

3512 100Base-TX

Repeater

100Base-TX

Smart Uplink Module

100Base-TX

Smart Uplink Module

100Base-TX

Smart Uplink Module

3512 100Base-TX

Repeater

100Base-TX Repeater

3512 100Base-TX

Repeater

Figure 1-14.

Smart Uplink Modules in a Hierarchical Environment (Models 3512/3612)

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Chapter 2

Planning Repeater Installation

This chapter contains information that will help you prepare for installing the
repeater. This includes optional hardware, installation requirements, cable
requirements, and system planning charts.

Optional Hardware

Along with the supplied hardware, your network installation might also require
the following optional items:

■

Backplane cable (2524/2624)

■

FlexPlane connector (3512/3612)

■

Smart Uplink modules (SUMs)

■

Redundant power supply (3512/3612)

Installation Requirements

To help ensure a correct installation, read this section to determine the
hardware, environmental, electrical, and spatial requirements.

Environmental Requirements

Be sure the operating environment for the repeater is within the following
ranges:

■

Temperature: 32° to 104° F (0° to 40° C)

■

Humidity: 5% to 95% (non-condensing)

■

Altitude: 0 to 10,000 feet (0 to 3 km)

■

Clearance: minimum of 2 inches (5.1 centimeters) on each side of the
repeater to allow for proper ventilation

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Electrical Requirements

The electrical requirements for a repeater are as follows:

■

Voltage: 100 to 240 VAC

■

Power:

❏

2524/2624 - 1.7A (@ 100 VAC) to 0.65A (@ 240 VAC)

❏

3512/3612 - 1.5A (@ 100 VAC) to 0.90A (@ 240 VAC)

■

Frequency: 50 to 60 Hz

CAUTION: The power outlet must be a non-switched, grounded power
source. Do not use a three-to-two pronged adapter at an outlet. Doing so
may result in electrical shock and/or damage to the repeater and will void
your warranty.

NOTE: The repeater comes with a shielded AC power cord. If you lose or damage
the supplied shielded power cord, replace it with a shielded power cord that meets
local regulatory requirements to ensure emissions compliance.

Spatial Requirements

The repeater's dimensions (HxWxD) are as follows:

■

2524/2624: 2.60 x 17.00 x 13.65 inches (6.7 x 43.6 x 35.0 cm)

■

3512/3612: 1.75 x 17.00 x 13.65 inches (4.5 x 43.6 x 35.0 cm).

You can interconnect up to three 2524/2624 repeaters in one stack and up to
five 3512/3612 repeaters in a stack. Be sure to allow at least 2 inches (5.1
centimeters) on each side of the repeater for proper air circulation and cable
connections.

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Cable Requirements

This section defines the requirements for cable used to connect the RJ-45 ports,
the Smart Uplink port, and the serial COM port. (Remember that the serial
COM port is only on Models 2624 and 3612.)

Understanding Fast Ethernet Cable Budgets

A cable budget is the overall length of cable allowed between two DTEs (data
terminal equipment, such as a PC) in a single network segment. With Fast
Ethernet, the cable budget is affected by the type of network media between
two DTEs and the class of repeater used. The Netelligent 2524/2624 and
3512/3612 100Base-TX repeaters are Class I repeaters.

Fast Ethernet uses Ethernet's CSMACD protocol. Therefore, the cable budget is
based on the time it takes for part of an Ethernet packet to reach one end of the
network and for notification of an error (a collision) to return before the entire
packet is generated. This period is called the propagation delay.

Figure 2-1.

Propagation Delay

Fast Ethernet transmits packets ten times faster than Ethernet. To compensate
for this timing difference, Fast Ethernet allows fewer repeaters per segment
than 10Base-T and allows a shorter distance between repeaters.

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Checking Your Cable Budget

The following sections state the cabling distance limitations, cable budget, for
100Base-TX and 100Base-FX. However, if your particular network installation
deviates from these examples, use the following guidelines to check your DTE­to-DTE cable budget:

■

Locate the longest DTE-to-DTE cable run and add the lengths of all the
cables (UTP and/or fiber) between the two DTEs.

■

Find the appropriate cable budget in the table below and verify that the
cable length for your installation is less than or equal to the table entry.

■

If the cable run you chose contains fiber, locate the longest DTE-to-DTE
run in your installation that consists of only UTP cable and check its
cable budget, as well.

NOTE: Cable budgets apply only to DTE-to-DTE cable runs that are directly
connected to or that pass through repeaters. If a Smart Uplink module, bridge,
switch, or router exists between the DTEs, the cable budget restarts when the
transmission passes through any of these devices.

Table 2-1 shows the maximum total length of cable allowed between any two
DTEs in a segment. (Information in this table was extracted from Table 29-2 of
the IEEE 802.3u specification.)

Table 2-1

Table of Maximum Cable Budgets in Meters (Feet in Parenthesis)

Connection Type

TX Only Fiber Only Fiber TX and Fiber

Direct

100 (328) 412 (1352) N/A N/A

One Class I Repeater

200 (656) 272 (892) 231 (758) 261 (856)

One Class II Repeater

200 (656) 320 (1050) 204 (669) 309 (1014)

Two Class II Repeaters

205 (673) 228 (748) 236 (774) 216 (709)

NOTE: A UTP cable should never exceed 100 meters (328 feet) in length.

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Cable Types and Distance Limitations

The following information states the required cable type and distance
limitations for 100Base-TX and 100Base-FX Fast Ethernet.

100Base-TX

100Base-TX is the IEEE 802.3u specification for transmitting 100 Mb/s Fast
Ethernet over two pairs of copper wire. The pinout, connectors (RJ-45 modular
plugs), and protocol (CSMA/CD) are exactly the same as for 10Base-T.

Unshielded Twisted Pair (UTP)

❏

Category 5 only

❏

Two pairs used (same as 10Base-T)

❏

Maximum 100-meter (328-foot) link

Shielded Twisted Pair (STP)

❏

Two pairs used (same as 10Base-T); other two pairs must be
terminated

Distance Rules

❏

One repeater hop per segment (because the repeater is a Class I
repeater)

❏

Collision domain diameter (total allowable distance end-to-end) is
200 meters (656 feet)

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Figure 2-2 shows the maximum cable distance for a DTE-to-DTE connection
with one repeater in the configuration using 100Base-TX cabling.

Figure 2-2. DTE-to-DTE 100Base-TX Connection

Figure 2-3 shows a one-to-one cable pinout for 100Base-TX.

TX+

TX+

TX-

TX-

RX+

RX+

RX-

RX-

DTE Repeater

1

8

1

8

Figure 2-3. One-to-One Cable Pinout for 100Base-TX

NOTE:

To prevent potential electromagnetic interference, terminate the unused

wires (4, 5, 7, and 8).

Figure 2-4 shows the crossover cable pinout for 100Base-TX.

Figure 2-4. Crossover Cable Pinout for 100Base-TX

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100Base-FX

100Base-FX is the IEEE 802.3u specification for transmitting 100 Mb/s Fast
Ethernet over two strands (one pair) of fiber optic cable.

Cable Type

❏

Fiber optic

❏

Multi-mode 62.5/125 to 100/150 micron fiber

❏

Both strands used

Media Connection Options

❏

FX(ST) type (Part Number 267042-001)

❏

FX(SC) type (Part Number 267043-001)

Distance Rules

❏

One repeater hop per segment

❏

Collision domain diameter (total allowable distance end-to-end) is
272 meters (892 feet)

Figure 2-5 shows the maximum cable length for an FX SUM-to-FX
SUM fiber connection (412 meters, 1352 feet).

Figure 2-5. FX SUM-to-FX SUM (Fiber) Connection

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Figure 2-6 shows the maximum cable distance for a DTE-to-DTE
connection with one repeater in the configuration using 100Base-FX
cabling.

Figure 2-6. DTE-to-DTE 100Base-FX Connection

Smart Uplink Port Cable

The Smart Uplink module requires the following types of cable:

■

TX Type (Part Number 267045-001)  Standard 4-wire twisted-pair
(UTP or STP), Category 5

■

FX (ST) Type (Part Number 276042-001)  Multi-mode 62.5/125
micron fiber

■

FX (SC) Type (Part Number 267043-001)  Multi-mode 62.5/125
micron fiber

Modem Cable

You can use a standard EIA RS-232 cable to connect the serial COM port,
located on the front panel of the managed 100Base-T repeater (Models 2624
and 3612), to a modem. This lets you perform out-of-band management and
Flash (firmware) downloads via a remote dial-up to the modem. When you
connect a PC to the serial interface for local management, you must use an EIA
RS-232 null modem cable.

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System Planning Charts

The charts in Figures 2-7, 2-8, and 2-9 provide a convenient way of planning
the connections for your repeater.

Port Connects To

1

2 3 4

5

6

7

8

9 10

11

12

Uplink

Module

2524/2624 Repeater Setup and Cabling Chart

Unit Number
Building
Location

Rack Mount
Table Mount

MAC Address
IP Address

Installed Uplink Module

None
TX
FX (ST Type)
FX (SC Type)

Date

18

17

1615

14

13

21

20

19

24

23

22

Figure 2-7.

2524/2624 Repeater Setup and Cabling Chart

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2-10 Planning Repeater Installation

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3512/3612 Repeater Setup and Cabling Chart

Port Connects To

1 2 3

4 5

6

7

8 9 10 11 12

Uplink

Module

Unit Number
Building
Location

Rack Mount
Table Mount

MAC Address
IP Address

Installed Redundant
Power Supply Module

Installed Uplink Module

None
TX
FX (Fiber)

Date

Figure 2-8. 3512/3612 Repeater Setup and Cabling Chart

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Figure 2-9. Rack Inventory Chart

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3-1

Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

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Chapter 3

Installing the Repeater

This chapter explains how to mount the repeater, attach cables, install a Smart
Uplink module, and interconnect repeaters. The illustrations in this chapter
show a 2624 repeater, but the procedure for installing the 2524/2624 and
3512/3612 repeaters is the same.

Mounting the Repeater

You can place the repeater on a level surface (table top or shelf, for example) or
mount it in a standard EIA 19-inch rack.

Attaching the Rubber Feet

If you will place the repeater on a table top or shelf, attach the supplied
adhesive-backed rubber feet as described in the following steps.

1. Turn the repeater over so that the bottom side is up.

2. Remove the four rubber feet from their packaging.

3. Peel the protective paper backing off the rubber feet. Then position the
feet near the corners of the repeater and press the feet into place.

4. Turn the repeater to its upright position and place it on the mounting
surface.

NOTE: Be sure to allow at least 2 inches (5.1 cm) on each side of the repeater for
proper air flow.

Rack-Mounting the Repeater

To mount the repeater in a rack, use the supplied mounting brackets, 3/8-inch
bracket screws, and 1/2-inch rack-mount screws.

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3-2 Installing the Repeater

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To rack mount the repeater, follow these steps:

1. Position the right bracket as shown in Figure 3-1 and attach it to the
repeater using four of the smaller, 3/8-inch bracket screws. Then tighten
the screws. Repeat this step to attach the left mounting bracket.

Figure 3-1. Attaching the Mounting Brackets

2. After you attach both mounting brackets, position the bracket slots over

the desired holes on the rack (Figure 3-2). Then insert and tighten the
four 1/2-inch rack-mount screws.

Figure 3-2. Positioning the Repeater in a Rack

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Installing a Smart Uplink Module

Netelligent 2624 and 3512/3612 managing repeaters have a Smart Uplink bay
that lets you install one of the following optional Smart Uplink modules
(SUMs):

■

➀

100Base-TX version (Part No. 267045-001)

■

➁

100Base-FX (fiber) version with ST connector

(Part No. 267042-001)

■

➂

100Base-FX (fiber) version SC connector (Part No. 267043-001)

Figure 3-3. Optional Smart Uplink Modules

NOTE:

The Smart Uplink port is the 25th logical port on the 2624 repeater (the 13th

logical port on the 3512/3612 repeater).

Inserting the Smart Uplink Module into a
2624 or 3512/3612 Repeater

To insert a Smart Uplink Module into a Netelligent 2624 or 3512/3612 repeater,
follow these steps:

1. Power down the repeater by disconnecting the power cord from the wall
outlet or power cord strip.

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2. Remove the Smart Uplink port cover plate from the 2624 or 3512/3612
repeater's front panel.

3. Insert the Smart Uplink module through the port hole, aligning the sides
of the SUM with the card guides inside the repeater (Figure 3-4).

CAUTION: Do not tighten the Smart Uplink Module’s spring screws until
completing Step 4 of this procedure. If you tighten the spring screws before
the SUM is properly seated in the socket, you may damage the repeater.

Figure 3-4.

SUM Installation

4. Carefully push the Smart Uplink module's 50-pin male connector into the

SUM socket on the repeater motherboard until the SUM is firmly seated
and its faceplate is flush with the repeater's front panel.

5. Secure the SUM to the repeater by tightening the SUM's spring screws.

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Connecting Twisted-Pair Cable

Each RJ-45 port on the repeater can accept a standard 8-wire twisted-pair (UTP
or STP) cable that ends with an RJ-45 connector. These ports can support cable
lengths up to 100 meters (328 feet). The TX models use Category 5 cable.

To attach twisted-pair cable, plug one of the RJ-45 connectors into the selected
port on the repeater. Connect the other RJ-45 connector into a 100Base-T­equipped device.

Figure 3-5.

Connecting Twisted-Pair Cable

Interconnecting Repeaters

You connect 2524/ 2624 and 3512/3612 repeaters in somewhat different ways.
Each method is described below.

NOTE:

You cannot mix 2524/ 2624 and 3512/3612 repeaters in the same stack.

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Interconnecting 2524/2624 Repeaters

You can interconnect one or two 2524 repeaters with one 2624 100Base-T
repeater to form one logical repeater stack that supports up to 72 Fast Ethernet
ports. You can also interconnect two 2524 repeaters to form one logical repeater
stack that supports up to 48 Fast Ethernet ports. Configurations include:

■

Two 2524 repeaters

■

One 2524 and one 2624 managing repeater

■

Two 2524 repeaters and one 2624 managing repeater

You can place the 2624 repeater in any position (top, middle, bottom) in a two­or three-repeater stack. The 2624 100Base-T repeater has an expansion
interface that consists of two 68-pin backplane connection cables (EXPN PORT
A and EXPN PORT B) on the repeater's back panel.

The 2524 repeater has one 68-pin backplane connection cable (EXPN PORT)
and two dip switches for UNM/MAN and HOST/TARGET settings. The switch
settings are described in the section “2524 Dip Switch Settings” in this chapter.

If possible, mount the repeaters on a rack or place them on a stable mounting
surface with the supplied rubber feet affixed before you attach the backplane
connection cable. This helps ensure the correct spacing between repeaters and
helps prevent stretching and possibly damaging the backplane connection cable
during installation.

2524 Dip Switch Settings

The dip switches on the back of the 2524 repeater come factory pre-set so you
can create a managed stack of three repeaters (one or two 2524 repeaters and
one 2624 repeater). Or, by reconfiguring the dip switches, you can create an
unmanaged stack of two 2524 repeaters. The dip switch settings are described
below:

IMPORTANT:

Incorrectly setting the dip switches will

not

damage the repeaters.

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HOST/TARGET

■

TARGET  (Factory default setting) Lets you connect one or two 2524
repeaters to a 2624 managing repeater to form a “managed” 72-port Fast
Ethernet repeater

■

HOST  Lets you connect two 2524 repeaters in an unmanaged stack
to form a single 48-port Fast Ethernet repeater (with no 2624 repeater in
the stack). One repeater must be re-configured as the HOST and the
other as the TARGET.

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Invalid Connections

The following are invalid connections for the 2524/2624 repeaters:

■

Connecting two 2624 managing repeaters together  Repeaters will
operate as if disconnected

■

Setting a 2524 repeater in a managed stack to the HOST mode 
Repeaters will operate as if disconnected and the HUB STATUS LED
on the 2524 and 2624 repeaters will be solid YELLOW to indicate
isolation. To correct, set the dip switch on the 2524 repeater to
TARGET.

■

Setting both 2524 repeaters in an unmanaged stack to HOST or to
TARGET mode  HUB STATUS LED will be solid YELLOW,
indicating the repeaters cannot communicate. To correct, set the dip
switch on one repeater to HOST and on the other as TARGET.

UNM/MAN

■

UNM (Unmanaged)  In this mode, if you change the dip switch on the
2524 repeater to UNM, all repeater ports on the 2524 are automatically
enabled after turning the repeater OFF and then ON. This mode lets you
use a 2524 under the following conditions:

❏

The 2524 is disconnected from the 2624.

❏

The 2624 is OFF or otherwise not operating.

■

MAN (Managed)  (Factory-default setting) In this mode, the port
configuration settings for the 2524 repeater are non-volatile. In addition,
if you remove the 2524 repeater from the stack, the disabled ports
remain disabled. (You can re-enable them by setting the dip switch to
UNM and turning the repeater OFF and then ON.) For example, if you
disable Ports 1 and 2, then power down the stack, Ports 1 and 2 will still
be disabled when the stack is powered up again.

In a managed stack, if you set the 2524 dip switch to UNM, the HUB
STATUS LED on the 2524 FLASHES GREEN.

Figure 3-6 shows EXPN PORT A and B of a 2624 repeater connected to the
EXPN PORTs of two 2524 repeaters using an backplane connection cable.

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Figure 3-6. Stack Connecting One 2624 and Two 2524 Repeaters with Backplane Connectors

In this example, the 2624 repeater (top repeater in the stack) manages two 2524
repeaters. The dip switches on both 2524 repeaters are set to “TARGET,” as
required in a managed stack.

Figure 3-7 shows two 2524 repeaters connected via a backplane connector
between the EXPN PORTs. The dip switches on the 2524 repeaters are set with
the top repeater as the HOST and the bottom repeater as the TARGET.

Figure 3-7. Interconnecting Two 2524 Repeaters Via a Backplane Connection Cable

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In this example, the unmanaged stack consists of the maximum of two 2524
repeaters. The top repeater has been set to HOST, while the bottom repeater is
the TARGET. Either repeater in the stack can be the HOST or the TARGET.
Both repeaters are in the factory-default MAN mode.

Interconnecting 3512/3612 Repeaters

You can interconnect up to five 3512/3612 100Base-T repeaters to form one
logical repeater that supports up to 60 Fast Ethernet ports. You can place the
managing repeater (Model 3612) in any position in the stack.

Each repeater has an expansion interface that is comprised of two 100-pin
connectors (UP and DOWN) on the repeater's back panel. Figure 3-6 shows
how the UP connector of a bottom repeater connects to the DOWN connector
of an adjacent upper repeater via a FlexPlane connector (Part No. 810172-000).
If possible, mount the repeaters on a rack or place them on a stable mounting
surface with the supplied rubber feet affixed before you attach the FlexPlane
connector. This helps ensure the correct spacing between repeaters and helps
prevent stretching and possibly damaging the FlexPlane cable during
installation.

WARNING:

The FlexPlane connector is not hot swappable. Be sure you

power down the entire repeater stack before you connect repeaters.

PWR A

PWR B

UP

DOWN

PWR A

PWR B

UP

DOWN

Backplane
Connector

100-240 VAC, 3A-1.5A,50/60 HZ

100-240 VAC, 3A-1.5A,50/60 HZ

Figure 3-8.

Interconnecting Repeaters with a FlexPlane Connector

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Connecting Power

Follow these steps to connect the repeater to power:

1. Plug the power cord into the power cord connector on the back of the
repeater. (In this example, a 2624 repeater is shown.)

Figure 3-9.

Connecting Power

2. Insert the three-pronged plug on the power cord into a non-switched,

grounded power source that is near the repeater and easily accessible.

WARNING:

Plugging in the power cord applies power to the repeater.

There is no ON/OFF switch on the repeater.

When you plug in the power cord, the repeater performs a power-on self test
(POST), which lasts approximately 1 minute. After a successful POST, the
LEDs indicate the current operating status. See the “LED Indicators” section in
Chapter 1, “Overview” for more information about the LED status.

If the POST fails, the STATUS LED flashes yellow. If this occurs, disconnect
the repeater from power and then reconnect power. If the problem continues,
contact Compaq Technical Support.

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3-12 Installing the Repeater

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Disconnecting Power

To disconnect power from the repeater, remove the power cord from the power
source. Do not remove the power cord from the power cord connector on the
repeater to disconnect power. Figure 3-8 shows the correct and incorrect ways
of disconnecting power from the repeater.

PWR A

100-240 VAC, 3A-1.5A,50/60 HZ

Do

Unplug the Power Cord

From the Grounded Power Source

Unplug the Power Cord

From the Repeater’s

Power Cord Connector

Do Not

Figure 3-10.

Disconnecting Power

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4-1

Netelligent 2524/2624 and 3512/3612 100Base-T Repeater User Guide

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Chapter 4

Repeater Management

This chapter discusses management topics common to both the 2624 and 3612
repeaters, including supported MIBs and frame types, IP and IPX support, and
the VT100/Telnet management. RMON (Remote MONitor) support and
intrusion protection (Model 3612) is at the end of the chapter.

Supported MIBs

Netelligent 2624 and 3612 repeaters support the following MIBs (Management
Information Bases) (unless noted, MIBs apply to both repeaters):

Supported MIBs

MIB Model 2624 Model 3612

RFC1213 (MIB II) and RFC1516 (Standard repeater MIB) Yes Yes
RFC1271 (RMON MIB) No Yes
Proprietary MIB Yes;

CPQN2624 MIB

Yes;
MDC100.MIB

Novell proprietary repeater MIB (lets Novell
Management Services directly manage the repeater)

Yes Yes

Supported Frame Types

Netelligent 2624 and 3612 repeaters support the following frame types:

Supported Frame Types

802.3 Raw (IPX)

802.2 SNAP (IPX)

Ethernet SNAP (IP)

Ethernet_II (IP)

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4-2 Hub Management

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NVRAM

Netelligent 2624 and 3612 repeaters store their management configurations
(supplied by the SNMP manager or the console manager, VT100 or Telnet) in
NVRAM (Non-Volatile RAM). This enables the repeater to recover from a
power failure with its full configuration intact.

CAUTION:

The non-volatile SRAM chip (Socket U1) on the repeater's
motherboard contains a non-replaceable lithium battery. Only trained service
personnel should dispose of this chip.

SNMP Management

Netelligent 2624 and 3612 repeaters supply SNMP management through both
in-band and out-of-band communications.

The repeater provides in-band SNMP support in the following manner:

■

UDP/IP and Novell's IPX protocol stacks

■

Telnet through TCP/IP for VT100 emulation

■

Proprietary protocol using IPX

The repeater provides out-of-band management in the following manner:

■

Serial Line IP (SLIP)

■

Serial interface using VT100 emulation

IP Support

Netelligent 2624 and 3612 repeaters support the following Internet protocols:

■

ARP  Address Resolution Protocol

■

RARP  Reverse Address Resolution Protocol

■

BOOTP  Boot Protocol

■

ICMP  Internet Control Message Protocol

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■

UDP  User Datagram Protocol

■

TCP  Transmission Control Protocol

■

SNMP  Simple Network Management Protocol

■

TFTP  Trivial File Transfer Protocol

ARP, RARP, and BOOTP provide Internet address resolution capabilities. The
repeater uses ARP to resolve the MAC address of any known Internet address
with which it needs to communicate. The repeater uses RARP and BOOTP to
resolve its Internet address based on the factory-assigned MAC address.

ICMP messages allow IP routers to communicate with various hosts to report
abnormal conditions or to send new routing information.

The repeater uses IP fragmentation to provide a seamless interface for
management software regardless of the physical constraints of the network
interface. IP messages can be up to 1520 bytes long.

IP Autodiscovery Support

Some SNMP management platforms cannot discover repeaters that are not in
the ARP cache of a gateway or router. Therefore, it is necessary to regularly
update the cache with the IP address of the repeater to be autodiscovered. When
IP communication stops between the agent and the SNMP management
software, the ARP cache on the gateway or router removes the agent's address
(because the agent no longer updates the ARP cache of the gateway or router).
The repeater periodically updates the cache by transmitting an ICMP ping to the
gateway.

IPX Support

The repeater supports SNMP over Novell's IPX protocol and SNMP over IP.
Using SNMP/IPX and Novell's repeater MIB, Novell's NMS can directly
manage the repeater. The repeater also supports SAP (Service Advertising
Protocol), RIP (Routing Information Protocol), and IPX diagnostics protocols.
These features make the repeater HMI (Hub Management Interface) compliant.

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4-4 Hub Management

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Using SAP, the repeater advertises itself as an HSL service. When Novell's
NMS initiates autodiscovery, it produces bindery requests through NCP
(NetWare Core Protocol) to a NetWare server. This allows NMS to obtain the
internal network number of the repeater's HSL server. RIP allows NMS to
obtain the MAC address and other necessary information to start SNMP over
IPX communication. IPX diagnostics is implemented only to support the
NetExplorer server. This protocol is not directly involved with the NMS
autodiscovery algorithm.

The proprietary IPX repeater protocol, as well as SNMP, is supported over
Novell's IPX protocol stack. The implementation of this protocol provides
support for Redirector. Through the Redirector, Novell's Hubcon can manage
the repeater.

The repeater IPX proprietary protocol provides a mechanism over IPX to set
the IP address. Since the IPX address of a repeater is derived from the network
number and the hardware MAC address, you do not need to set an address for
IPX communication. Using the proprietary protocol, you can set the IP address,
subnet mask, default gateway IP address, SNMP write community, IPX frame
type, RARP and BOOTP, SAP broadcast disable, and an additional parameter
for the frame type.

The repeater supports the following frame types: IPX over Ethernet II, 802.3
RAW, 802.2 Type I and II, and 802.2 SNAP.

Configuring the Repeater at Bootup

You can configure a BOOTP server to supply the IP address, subnet mask, and
a default gateway IP address for a particular hardware MAC address. When you
power up a repeater stack, the managed repeater uses the information stored in
NVRAM to configure the repeater at bootup. There are two boot phases: Boot
and Runtime.

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In the Boot phase, the HUB STATUS LED is yellow. If you have enabled
BOOTP/RARP requests, the repeater issues the number of requests defined in
the fsnBootpRarpRetries MIB object in the CPQN2624 MIB (2624) or
MDC100 MIB (3612) and displayed in the VT100 console interface). The
default number of requests is two. The repeater issues the requests using two
different frame types (Ethernet_II and 802.2 SNAP). You define the interval
between requests in the fsnBootpRarpRetryInterval MIB object. The interval
for the default request retry is 5 seconds.

In the Runtime phase, the HUB STATUS LED is green. If BOOTP/RARP
requests are enabled and the repeater does not have an IP address currently
assigned, the repeater issues requests every 5 minutes using only one frame
type (same as the IP frame type).

If the repeater receives a response from either type of server, the managed
repeater uses the information and configures the stack accordingly.

If desired, you can use your network management software or the serial
interface to set the fsnBootpRarpRequests MIB variable so that the repeater
does not issue BOOTP/RARP requests. This is preferred if you use only IPX
communication, as it helps reduce unnecessary traffic generated by the repeater.

NOTE: A RARP server provides only an IP address. A BOOTP server is required to
automate downloads.

Using the VT100 Serial Port/Telnet
Management Interface

Besides SNMP and RMON (3612 only) network management, the repeaters
support out-of-band management via a serial port connection and in-band
management via a Telnet connection. These let you set numerous management
parameters, including the IP address and subnet mask for both the Ethernet and
serial interface, as well as the default gateway IP address and SNMP write
community for the Ethernet interface. The VT100 interface has two distinct
modes of operation, Boot and Runtime, which let you perform the following
management operations:

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Boot Mode (HUB STATUS LED is yellow)

■

View and edit system information

■

Download firmware via XMODEM or TFTP (over Ethernet)

■

Set up the modem

■

Change the password

Runtime Mode (HUB STATUS LED is green)

All the above functions plus:

■

View and edit port and port group statistics/status

■

Change the backup port configuration

■

Download firmware via TFTP over SLIP (if the session is running
through Telnet over an Ethernet connection)

Setting up the Terminal Emulation Program

Set up the terminal emulation program with the following settings:

■

8 data bits

■

1 stop bit

■

No parity

■

9600 bps

■

No flow control

NOTE: If you use the Windows 3.1 Terminal program, select Terminal Preferences
from the Settings menu. Then uncheck the Use Function, Arrow, and Ctrl Keys

for
Windows option box. This enables the arrow keys to function correctly in the
interface program. If you use the Windows 95 HyperTerminal program, enter a
name in the Connection Description box and set up a New Connection Direct to
Com 1. Set the Com 1 Port Settings as described above. From File
Properties/Settings, set the Emulation to VT100.

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Starting the Management Session

NOTE:

The Login screen in the VT100 console interface requires that you enter your

password within a specific amount of time.

You start the management session for the 2624 and 3612 repeaters in the same
way. When you apply power to the repeater, the Boot phase starts (the HUB
STATUS LED is yellow). After about 10 seconds, the HUB STATUS LED
changes to green to indicate that the repeater is in the Runtime phase and is
ready for the management session.

After the repeater enters the Runtime mode, follow these steps to start a
management session.

If the repeater uses a null modem connection, start with Step 1.
If the repeater uses a regular modem connection, start with Step 2.

1. In the Runtime mode, the repeater firmware displays a modem

initialization string every 10 seconds, with each string representing a
different baud rate (19.2K, 14.4K, 9600, and 2400). When the firmware
detects the baud rate that matches the terminal baud rate, it displays a
readable alphanumeric character string similar to the following:

at&fs0=1

2. Within 10 seconds after a readable alphanumeric character string

appears, enter the following command:

VT100

The Login screen appears.

Figure 4-1.

Login Screen

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NOTE: If the 10 seconds expires before you enter VT100, you must wait for the

port to cycle back to the modem initialization string.

3. Within 10 seconds after the Login screen appears, enter the password.

The default password is <public>. The Main menu screen appears.

NOTE: The following screen shows the Runtime main menu for a 2624
repeater (the 3612 repeater also contains a Stack Configuration option). If you
start the VT100 session while the HUB STATUS LED is orange (less than 1
minute after you power up the repeater), the Boot main menu appears. This
menu differs slightly from the Runtime menu. To get to the Runtime main
menu from the Boot main menu, you must end the VT100 session, wait for the
HUB STATUS LED to turn to green, and then restart the VT100 session.

Figure 4-2.

Main Menu Screen

Error Messages

If you enter an incorrect password, the following error message appears:

ERROR: Password incorrect, please re-enter.

If you forget the password, contact Compaq Technical Support.

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Navigating Menu Option Screens

To select a menu option from the Main menu screen, use the Tab key or arrow
keys to position the cursor on the option. Then press the Enter key to display
the screen for the selected option.

Each menu option screen displays the system time, system name, and repeater
IP address. Some menu options screens let you edit various fields. Editable
fields are highlighted. Other screens allow you only to view the information on
the screen. Un-editable fields are in normal text (not highlighted).

Use the following methods to navigate a menu option screen:

■

To move the cursor from one field to the next, press the Tab key or the
arrow keys. Press the right or down arrow key to move the cursor
forward, and press the left or up arrow key to move the cursor backward.
When the cursor is on a field, it blinks to indicate its position.

■

Multiple-choice fields are enclosed in left and right angle brackets (<>).
To toggle between options for a field, press the space bar.

■

To apply changes to all modified fields and return to the main menu,
move the cursor to the Accept changes box and press the Enter key. To
return to the main menu without saving changes, move the cursor to the
Cancel changes field and press the Enter key.

■

To execute an operation, press the Enter key.

NOTE: If you use the Windows 3.1 Terminal program, select Terminal Preferences
from the Settings menu. Then uncheck the Use Function, Arrow, and Ctrl Keys

for
Windows option box. This enables the arrow keys to function correctly in the
interface program. If you use the Windows 95 HyperTerminal program, enter a
name in the Connection Description box and set up a New Connection Direct to
Com 1. Set the Com 1 Port Settings as described above. From File
Properties/Settings, set the Emulation to VT100.

The following sections describe each menu option screen.

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Viewing System Information

The System Information screen shows the primary system identification
information.

Figure 4-3.

System Information Screen

You can select the following frame types from the System Information window:

■

IP frame types: Ethernet_II or Ethernet SNAP

■

IPX frame types: 802.2, or 802.3

Error Messages

The following error message can occur if you have incorrectly entered
information in the System Information window:

ERROR: The field must be in the range [0...255]

The following error messages can occur if entered values are out of range:

ERROR: The value is too small
ERROR: The value is too large

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Viewing the Stack Configuration
(Model 3612)

The Stack Configuration screen (Model 3612) shows the unit number,
backplane number, backplane type, managed status, and unit description. You
can change only the backplane number (1, 2, 3, or Isolated). When you make a
change, the change becomes effective immediately.

Figure 4-4.

Stack Configuration Screen

The Managed Status field indicates the status of the repeater’s hardware
management override switch setting (see “Appendix B, Internal DIP Switch
[Models 3512/3612]”). If the field reads Yes, the switch is at its default (no
management override) setting.

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Viewing the Backup Port Configuration

The Backup Port Configuration screen shows information about the slot
number of the primary and backup port and the status of the ports. The screen
also lets you add, delete, and enable or disable the state of backup
port entries.

Figure 4-5.

Backup Port Configuration Screen

Adding a Backup Port Entry

To add a backup port entry, follow these steps:

1. From the Action field, move the cursor to the Primary Unit entry field.

Then enter the number of the desired primary unit.

2. Move the cursor to the Primary Port entry field. Then enter the number of

the desired primary port.

3. Move the cursor to the Backup Unit entry field. Then enter the number of

the desired backup unit.

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4. Move the cursor to the Backup Port entry field. Then enter the number of

the desired backup port.

5. Move the cursor to the State Entry field and press the space bar to select

Enable or Disable.

6. Move the cursor to the Action field and press the space bar until Add

appears.

7. Press the Enter key. The new backup port entry appears in the backup port

configuration list.

Deleting a Backup Port Entry

To delete a backup port entry, follow these steps:

1. When the cursor at the Action field, press the - or + keys to highlight a

backup port entry.

2. Move the cursor to the Action field and press the space bar until Delete

appears.

3. Press the Enter key.
When you delete an entry, the backup port remains disabled. To enable the port,

see the section “Port Statistics” in this chapter.

Updating the State of a
Backup Port Entry

To update the state of a backup port entry, follow these steps:

1. Press the - or + keys to highlight a backup port entry.

2. Move the cursor to the State entry field.

3. Press the space bar until the desired option (Disabled or Enabled) appears.

4. Press the Enter key.

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Error Messages

The following error messages may appear if you enter information incorrectly
in the Backup Port Configuration window:

ERROR: Input fields not complete
ERROR: Unable to set backup group
ERROR: Invalid port number
ERROR: Unable to set backup group and port

To correct the error, be sure you have correctly entered all the necessary
information in the various fields, including valid port and backup port numbers.
Be sure the spelling and number sequences are correct. If the error message
continues to appear, contact Compaq Technical Support.

NOTE: To move to the Return to menu field, the cursor must first be in the
Action field.

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Viewing Port Statistics

The Port Statistics screen shows statistical information for each port, as shown
in the following illustration.

Figure 4-6.

Port Statistics Screen

To enable or disable a port, move the cursor to the desired port and press the
space bar. You can toggle the <Port State> field to Enabled/Disabled.

To scroll forward or backward to other ports, move the cursor to the Scroll field
and press the < and > keys. To scroll forward or backward to other units, move
the cursor to the Scroll field and press the - and + keys.

Shortcut: You can change the Scroll setting to scroll up to nine ports at a time
(the default is one, as shown in Figure 4-5). When you press the < and > keys,
the screen scrolls the specified number of ports.

NOTE:

Refer to the glossary for definitions of these statistics.

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Viewing Port Group Statistics

The Port Group Statistics screen shows statistical information for a specific port
group. This information varies for the 2624 and 3612 repeaters, each of which
is shown below. The 2624 repeater displays the unit number, managed status,
readable frames, and collisions (Figure 4-7).

Figure 4-7.

Port Group Statistics Screen (Model 2624)

The 3612 repeater displays the unit number, backplane number, backplane
type, managed status, readable frames, and collisions (Figure 4-8).

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Figure 4-8. Port Group Statistics Screen (Model 3624)

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Changing Your Password

The Change Password screen lets you change your current password. To
change your password, follow these steps:

1. Enter the old password in the Old password field.

NOTE:

You must enter information in the Old password field to advance the

cursor to the New and Verify password fields.

2. Enter the new password in the New password and Verify password fields.

3. Press the Enter key.

Figure 4-9.

Change Password Screen

Error Messages

The following error messages can occur if you have incorrectly entered
information in the Change Password window:

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ERROR: Old password not valid
ERROR: Verify Password does not match New Password

Downloading Firmware

The Download Firmware screen lets you download an updated version of
firmware. You can download Runtime only or a combination of Boot and
Runtime. The download can take place via a serial connection using XMODEM
(default) or TFTP over Ethernet, or via a Telnet connection using TFTP over
SLIP or Ethernet. Null modem SLIP connections can only occur at 9600 baud.
SLIP connections over a remotely linked modem are available at 2400, 9600,
and 19.2K baud.

Figure 4-10.

Download Firmware Screen

To download firmware, follow these steps:

1. Position the cursor on the Download Type field. Press the space bar to

select Runtime Only or Boot/Runtime.

2. Position the cursor on the Protocol type field. Press the space bar to

select the desired option (XMODEM, TFTP, and so forth).

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3. Position the cursor on the Version field and enter the firmware version,

including any leading zeros (no periods). This information must be
correct for a successful download. Refer to any release notes, README
files, or other documentation that accompanies the firmware upgrade for
the correct firmware version.

4. If you selected TFTP as the protocol type, enter the TFTP server IP

address in the TFTP server IP address field and enter the firmware
image filename in the Filename field.

5. To execute the download, position the cursor on the Start download field

and press <Enter>. Or, to cancel the download and return to the Main
menu screen, position the cursor on the Return to menu field and press
the Enter key.

Error Messages

The following error messages may appear if you enter information incorrectly
in the Download Firmware window:

ERROR: Invalid parameter set
ERROR: Version string invalid
ERROR: Invalid version identifier

To correct the error, be sure you have entered the correct parameters and
version string. Be sure the spelling and number sequences are correct. If the
error message continues to appear, contact Compaq Technical Support.

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Setting Up the Modem

The Modem Setup screen lets you enter the modem's initialization string and
disable or enable auto negotiation. The default initialization string is usually
adequate. For more information, refer to the modem documentation.

Figure 4-11.

Modem Setup Screen

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Logging Out of the Management Session

The Logout screen lets you end the VT100 management session.

Figure 4-12.

Logout Screen

If you select Yes, the Login screen reappears and you have 10 seconds to retype
the password if desired.

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RMON Support (Model 3612)

The 3612 repeater's remote monitoring (RMON) support allows the
management system to remotely monitor the repeater for diagnostic purposes.
The repeater supports four RMON groups including Statistics, History, Alarm,
and Event.

Statistics Group

The Statistics group contains statistics measured for a collision domain. This
helps indicate the load on a collision domain and the overall health of the
domain by reporting conditions such as CRC (cyclic-redundancy check)
alignment errors, collisions, and undersize and oversize packets.

History Group

The History group records periodic statistical samples from the collision
domain and stores them in an SNMP table for later retrieval. The historyControl
table stores configuration entries, each of which defines an interface, polling
period, and other parameters. Once samples are taken, the sample data is stored
in an entry in a media-specific table. Each such entry defines one sample and is
associated with the historyControl entry that caused the sample to be taken. The
only media-specific table defined is the etherHistoryTable, for Ethernet
networks. You can specify the number of samples and sample interval.

You can sample the following variables:

■

Octets

■

BroadcastPkts

■

MulticastPkts

■

CRCAlignErrors

■

UndersizePkts

■

OversizePkts

■

Fragments

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■

Jabbers

■

Collisions

■

Utilization

Alarm Group

The Alarm group periodically takes statistical samples from variables and
compares them to previously configured thresholds. The alarm table stores
configuration entries, each of which defines a polling period and various
threshold values. If a monitored variable exceeds a threshold value, the repeater
generates an event. No more events are generated for that threshold until the
opposite threshold is exceeded. You can limit the generation of events via the
MIB. When sampling a delta value, you can increase the precision of the
sample by taking the sample twice per period and comparing the sum of the
latest two samples to the threshold. This allows the repeater to detect threshold
crossings that span the sampling boundary. This does not require any special
configuration of the threshold value.

Event Group

The Event group controls the generation and notification of events from the
repeater. Each entry in the eventTable describes the event's parameters that can
be triggered. The repeater generates an event when an associated condition is
present in the MIB. The event can trigger a related function in the MIB. Each
eventEntry can specify that, when an event occurs, a log entry and an SNMP
trap message is created for the event. The community for the SNMP trap
message is contained in the associated eventCommunity object. The condition
that triggers the event determines the enterprise and specific trap fields of the
trap. If the eventTable is triggered by a condition specified elsewhere, the
enterprise and specific trap fields must be specified for traps generated for
that condition.

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Intrusion Protection (Model 3612)

The 3612 repeater's firmware supports intrusion protection, which provides a
method of preventing unauthorized access to the network. Intrusion protection
allows any SNMP manager to configure one MAC address per port and to
enable or disable intrusion protection on a per port basis.

Do not set intrusion protection on an uplink port that receives multiple MAC
addresses. Otherwise, the repeater partitions the port.

Follow these steps to enable intrusion protection for a port:

1. Using an SNMP MIB browser, set the authorized MAC address in the

mdcIntrusionPortMACAddress or mdcIntrusionPortMACAddressStr
MIB variable.

2. Set the mdcIntrusionPortStatus MIB variable to enable(2).

Once you configure intrusion for a port, the repeater's firmware monitors the
port for intruders. If the port detects an unauthorized MAC address, the repeater
partitions the port, sets mdcIntrusionPortStatus variable to tripped(3), and
generates a Novell Health State trap in the trap table.

To restore the port after it detects an intruder, use an SNMP manager to set the
rptrBasPortAdminState MIB variable (located in the Novell MIB) to enable(2).

Changing the Status of a Port

The SNMP manager lets you change the intrusion status of a port via the
mdcIntrusionPortStatus MIB variable. To do so, follow these steps:

1. Verify that the mdcSecurityStatus MIB variable is set to disable(1).

2. Set the mdcIntrusionPortStatus MIB variable to disable(1) or enable(2).

NOTE:

If the SNMP manager tries to change the settings of mdcIntrusionPortStatus
when mdcSecurityStatus is set to enable(2), a PDU error occurs. See “Security” in
the next section for more information about the mdcSecurityStatus settings.

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Security

The security feature provides further network security by restricting access to
the mdcIntrusionPortStatus, mdcIntrusionPortMACAddress, and
mdcIntrusionPortMACAddressStr MIB variables. You can restrict access to
these intrusion table MIB variables by setting the mdcSecurityStatus MIB
variable to enable(2). The default value is disable(1), which allows the SNMP
manager to directly access the intrusion table through normal SNMP set PDUs
(Protocol Data Units).

CAUTION:

Once you set mdcSecurityStatus to enable(2), you cannot
directly disable security; you must use the mdcSecurityResetStatus MIB
variable to indirectly set mdcSecurityStatus to disable(1). If you need to set
values in the intrusion table after you enable security, you must do so using
the mdcSecurityCommand MIB variable (an encrypted value). Do not set
mdcSecurityStatus to enable(2) unless the SNMP manager can encrypt
values for the mdcSecurityCommand and mdcSecurityResetStatus MIB
variables. Do not use a MIB browser to enable security.

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Appendix A
Specifications

The following specifications list the physical, electrical, and environmental
characteristics of the repeater.

Physical

■

Weight

❏

2524/2624: 11.00 lb (4.78 kg)

❏

3512/3612: 6.65 lb (3.01 kg)

■

Dimensions (HxWxD)

❏

2524/2624: 2.60 x 17.00 x 13.65 inches (6.7 x 43.6 x 35.0 cm)

❏

3512/3612: 1.75 x 17.00 x 13.65 inches (4.5 x 43.6 x 35.0 cm)

■

Rubber Foot: 0.25 inches, 0.635 cm high

Electrical

■

Power

❏

2524/2624 - 1.7A (@ 100 VAC) to 0.65A (@ 240 VAC)

❏

3512/3612 - 1.5A (@ 100 VAC) to 0.90A (@ 240 VAC)

■

Power Supply

❏

2524/2624 - 110W internal

❏

3512/3612 - 90W redundant, hot-swappable

■

Frequency: 50 to 60 Hz

■

Cooling

❏

2524/2624 - One 60mm, 5 VDC fan (rear-mounted)

❏

3512/3612 - Two 40mm, 12 VDC fans (rear- and side-mounted)

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Environmental

■

Temperature: Operating: 32° to 104° F, 0° to 40° C
Storage: 32° to 151° F, 0° to 60° C

■

Humidity: Operating/Storage: 5% to 95% (non-condensing)

■

Altitude: Operating: 0 to 10,000 ft, 0 to 3 km
Storage: 0 to 30,000 ft, 0 to 9 km

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Appendix B

Internal Dip Switch
(Models 3512/3612)

If management is not available for the repeater, you can isolate the repeater's
collision domain from other repeaters in the stack by setting an internal dip
switch that is accessible through the Power Supply A or B opening. The
following diagram shows the available switch settings.

11

1

1

22

2

2

3

3

Switches 1 and 2:

Backplane Select

Switch 3:

Hardware Override

= Backplane 1

= Enable Switch Settings

= Disable Switch Settings

(default)

= Backplane 2

= Backplane 3

= Isolated

100Base-T Repeater Internal DIP Switch

ON

1122334

4

Figure B-1. Optional Dip Switch Settings

CAUTION:

After you set the dip switches and power on the repeater, all
ports on the unit default to enabled. In this “standalone” mode, you cannot
change the repeater's configuration from the management platform. Use
this mode of operation only when all other configuration methods are
unsuccessful.

NOTE:

Switch 4 is not used.

NOTE:

The unmanaged 2524 repeater contains external dip switches on the back
of the unit. The functions of these switches differ from the 35122/3612 dip
switches. For information about the dip switch settings for the 2624 repeater, see
the section “Dip Switch Settings” in Chapter 3.

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Appendix C

Upgrading the DRAM
(Model 3612)

The 3612 repeater comes with 512KB of DRAM pre-installed. You can
upgrade the DRAM by installing a 4MB or 8MB SIMM. More DRAM allows
the repeater to collect more RMON statistics.

Figure C-1. 8MB SIMM for DRAM Upgrade

Installing a SIMM

Follow these steps to install a SIMM in the repeater.

1. Disconnect power from the repeater by removing the power cord from

the power source.

NOTE:

Do not disconnect power by removing the power cord from the
repeater's power cord connector on the back panel. This is not a tested
disconnect.

2. Remove the chassis cover from the repeater.

3. Facing the front of the repeater, locate the SIMM socket at the front of
the elevated PCB on the left of the repeater.

4. Align the SIMM's contacts with the contacts in the SIMM socket. Then
carefully press the SIMM into the socket.

5. Push the SIMM into the metal tabs until the SIMM snaps into place.

6. Replace the chassis cover.

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Appendix D

Electrostatic Discharge

A discharge of static electricity from a finger or other conductor may damage
printed circuit boards or other static-sensitive devices. This type of damage may
reduce the life expectancy of the device.

Preventing Electrostatic Discharge

To prevent electrostatic damage, observe the following precautions:

■

Avoid hand contact by transporting and storing parts in
static-safe containers.

■

Keep electrostatic-sensitive parts in their containers until they arrive at
static-free workstations.

■

Place parts on a grounded surface before removing them from
their container.

■

Avoid touching pins, leads, or circuitry.

■

Always be properly grounded when touching a static-sensitive
component or assembly.

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Grounding Methods

There are several methods for grounding, Use one or more of the following
measures when handling or installing electrostatic-sensitive parts:

■

Use a wrist strap connected by a ground cord to a grounded workstation
or the computer chassis. Wrist straps are flexible straps with a minimum
of 1 megohm +/- 10 percent resistance in the ground cords.

■

Use heel straps, toe straps, or bootstraps at standing workstations. Wear
the straps on both feet when standing on conductive floors or dissipating
floor mats.

■

Use conductive field service tools.

■

Use a portable field service kit with a folding static-dissipating
work mat.

If you do not have any of the suggested equipment for proper grounding, have
an Authorized Compaq Service Provider install the part.

NOTE: For additional information on static electricity, or assistance with the
installation of this product, contact your Authorized Compaq Service Provider.

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Glossary

This Glossary defines general terms associated with local area networks and
with 2524/2624 and 3512/3612 repeaters.

10BASE-T

An IEEE Standard (802.3) for local area networks. Complying networks
must be able to carry information at a rate of 10 Mb/s over distances up
to 100 meters of unshielded twisted-pair cable.

100Base-T

An IEEE Standard (802.3) for local area networks. This term is
synonomous with Fast Ethernet and encompasses 100Base-TX,
100Base-T4, and 100Base-FX.

100Base-T4

The IEEE 802.3u specification for transmitting 100 Mb/s Fast Ethernet
over four pairs of copper wire (including Categories 3, 4, and 5).

100Base-TX

The IEEE 802.3u specification for transmitting 100 Mb/s Fast Ethernet
over two pairs of copper wire.

802.2 SNAP

(Sub-Network Access Protocol)A variation on the 802.2/802.3 scheme
which expands the 802.2 LLC header to provide sufficient space in the
header to identify almost any network protocol.

802.3

An IEEE standard for Ethernet local area networks based on Carrier
Sense Multiple Access with Collision Detection (CSMA/CD), which
includes 10BASE2, 10BASE 5 and 10BASE-T.

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802.3 RAW

A frame type that uses the packet format defined by the 802.3 IEEE
standard without the additional header support such as that provided by

802.2.

ARP

Address Resolution Protocol is used by the TCP/IP protocol stack to
dynamically bind an IP address with a MAC address.

Autopartition

A port is autopartitioned (disabled) by the hardware after a continuous
collision for 1024 to 2048 bit times or after it detects 32 consecutive
collisions.

Backplane

The data bus used to interconnect different communications modules in
a concentrator or repeater stack.

Boot Sectors

The 3512/3612 repeater uses 96KB sectors of Flash as the firmware boot
sectors. The primary boot sector, which is hardware write-protected,
cannot be modified by downloading the Flash.

BOOTP

Bootstrap ProtocolA BOOTP server can be used to provide the initial
repeater configuration parameters (e.g., IP address, IP net mask, IP
default gateway) and to assist in downloading the latest version of the
Flash. A repeater BOOTP request contains its MAC address.

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Bridge

A program running on a computer connecting two LANs that allows
traffic from one network to be exchanged with a second network. The
networks can be the same or very different (e.g., Ethernet and
Token Ring).

Cable Budget

The overall length of cable allowed between two DTEs in a single
network segment.

Class I

An IEEE 802.3u repeater class that specifies that only one repeater or
repeater stack is permitted in the data path. Class I repeaters can
typically support a mix of T4, TX, and FX ports. The 2524/2624 and
3512/3612 repeaters are Class I repeater.

Class II

An IEEE 802.3u repeater class that specifies that up to two repeaters or
repeater stacks are permitted in the data path.

COM Port

The communications port on a workstation, server, or other DTE. This
port is sometimes referred to as the serial, RS-232, or DB-9 port.

CSMA/CD

Carrier Sense Multiple Access/Collision Detect. This communications
access method is used by both 10Base-T and 100Base-T networks.

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DB-9

A category of connector that contains nine pins. DB-9 connectors are
commonly used for RS-232 interfaces. For example, a computer's serial
(COM) port is usually a DB-9 connector.

DIP Switch

Dual In-line Package Switch. A DIP switch contains a set of small
switches that are usually used to set a configuration component of a
device.

DTE

Data Terminal Equipment. A device that sends or receives data over a
communications channel.

DUART

Dual Universal Asynchronous Receiver Transmitter; a UART provides
hardware support for serial communications.

Ethernet II

Ethernet II or "Ethernet DIX v2" was defined by Digital, Intel, and
Xerox. The frame format for Ethernet II differs from that of 802.3 in that
the header specifies a packet type instead of the packet length.

Fast Ethernet

A term that describes the different categories of the IEEE 100Base-T
standard. This includes 100Base-TX, 100Base-T4, and 100Base-FX.

FDDI

Fiber Distributed Data Interface. A high-speed communications standard
that uses fiber cabling as the data transfer medium.

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Flash

A memory device that allows unlimited read and limited write
(approximately 100K) cycles. Flash PROM in the 2624 and 3612
repeater contains the boot sectors (hardware write protected), an SNMP
information sector and the Flash program sectors.

Hub

A device or group of devices that localizes the connections for multiple
network nodes.

Hot Swappable

Ability to add or remove a repeater or module without removing power.
The 3512/3612 repeater is hot swappable.

Hub Autodiscovery, Novell:

The following terms are associated with the Novell repeater
autodiscovery:

IPX Autodiscovery: The ability of a network manager to discover the
node address and functionality of network devices. The 2524/2624 and
3512/3612 repeaters support IPX autodiscovery.

HMI Driver: A Hub Management Interface (HMI) driver is an ODI
driver running on a NetWare server that is compliant with the Novell
HMI specification. A node may emulate an HMI driver by supporting
the Novell NWHUB.MIB and IPX autodiscovery.

IPX Diagnostics: IPX diagnostics are required to support the Novell
NetExplorer server. The NetExplorer server is used to update the NMS
database with the current network configuration.

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RIP: NetWare Routing Information Protocol (RIP) is the routing
protocol used by IPX routers. Using a distance-vector routing protocol,
it optimizes the routing between source and destination addresses by
minimizing the "hop" count. The firmware supports RIP to allow NMS
to ascertain the repeater's MAC address, thus allowing NMS to initiate
SNMP over IPX communications.

SAP: The NetWare Services Advertising Protocol (SAP) allows the
firmware to advertise its services. The SAP requests, which are issued
over IPX, are broadcasted every 60 seconds. The SAP packet contains
the SAP IDs of the available services.

SAP ID: The SAP ID is used to identify the type of services available
by a server.

ICMP

Internet Control Message Protocol provides error handling and control
messages for TCP/IP.

IEC

International Electrotechnical Commission. Sets international electrical
and electronics standards.

IEEE 802.3u

An IEEE standard that states the specifications of Fast Ethernet.

IP

Internet Protocol provides connectionless, best effort datagram delivery
service.

IP Address

The Internet Protocol address assigned to a repeater, module or node.

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IPX

Novell NetWare Internetwork Packet eXchange protocol that provides a
connectionless datagram service.

Jabbering

Continuous transmission from a node; generally as a result of a
hardware or firmware failure.

LED

Light Emitting Diode. An LED usually indicates the operating status of
a device by displaying various conditions (i.e., different colors and
on/off states).

Link Test

A link test is performed by the hardware to ensure the integrity of the
cable (i.e., the link). The link test can be disabled to allow old style NICs
which are not capable of performing a link test to connect to the
repeater. For 10Base-T, the link test is a periodic pulse sent during idle
times between packets. For 100Base-T, a continuous transmission of
idle codes are sent between packets to ensure link integrity.

MAC Address

The Ethernet MAC address is a 6-byte node address. All Ethernet node
addresses are unique. The MAC address of a 2524/2624 or 3512/3612
repeater must be known before the repeater IP address can be set.

Manageable

A module is manageable if it contains a SNMP agent and there is a data
communication path to that agent.

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MIB

Management Information Base describes an agent's configuration
flexibility, diagnostic ability and information that can be reported to a
network management station.

MIC

Media Interface Connector. A MIC is the physical connection between
the optical fiber and a workstation in an FDDI installation.

MII

Media Independent Interface.

NCP

NetWare Core Protocol. NCP provides a method of controlling
communications between a client station and server.

NIC

Network Interface Controller.

NMS, Novell

Novell's NMS (NetWare Management System) is an integrated network
management system that provides a platform for managing a
multivendor, heterogeneous network environment. NMS can
autodiscover network services by monitoring transmitted SAP IDs. The
2524/2624 or 3512/3612 repeater will advertise that it has HMI driver
and repeater services.

NVRAM

NonVolatile Random Access Memory is generally implemented with
battery backed up CMOS RAM and/or with Flash PROM.

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Octet

An octet consists of 8 bits (i.e., a byte).

Partition

The electrical disconnecting of a node from a LAN at its point of
connection to a repeater. The node remains physically attached. A node
can be autopartitioned by the hardware based on network errors. If the
node is autopartitioned, the repeater continues to listen to the node and
removes the autopartition if the signal becomes acceptable.

POST

Power-On Self Test. A POST consists of a series of diagnostic tests that
a computer or other device runs when power is first applied to the unit.

Port

An external connector in which a cable is plugged; used to connect PCs
and other node devices to the network.

Propagation Delay

The length of time required for part of an Ethernet packet to reach the
far end of a network and for notification of an error (collision) to return
before the entire packet is generated.

RARP

Reverse Address Resolution Protocol. A Reverse ARP server can be
used to set a repeater's IP address.

Reconnection

The hardware uses a standard reconnection algorithm that reconnects
(i.e., enables) an autopartitioned port after data is received for 488 bit
times without a collision.

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Repeater Hop

The action of a data transmission passing through a repeater in a
communications circuit. IEEE 802.3 standards specify the number of
repeater hops allowed for various types of repeaters. For example, Class
II repeaters allow up to two repeater hops per segment.

RJ-45

An 8-wire modular connector used for RJ-45 Ethernet and some
telephones.

RMON

Remote Monitor. RMON allows remote data collection and analysis.

Router

A program that connects two networks together. Routers are much more
intelligent than bridges and should be used when packets need to be
routed according to their higher level protocols. Unlike bridges, routers
can maintain several alternative paths and can choose the best path based
on traffic conditions.

RS-232

The EIA (Electronics Industries Association) recommended standard
232 defines a standard way of transferring serial information by wire
using single-ended line drivers and receivers. RS-232 lines generally
include transmit, receive, ground and various control lines.

RS-485

The EIA (Electronics Industries Association) Recommended Standard
485 defines a standard way of transferring serial information by wire
using differential line drivers and receivers.

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SAP

Service Advertising Protocol. SAP distributes services information to all
nodes in an IPX network.

SC Connector

A low-cost optical fiber connector.

Segment

A segment is a separate collision domain. Each Ethernet segment
supports a 10 Mb/s bandwidth. A multiple segment implementation
increases the bandwidth of a Local Area Network.

Segmentation

Segmentation is the process of dividing a network into multiple collision
domains.

Server

A computer shared by multiple users in a client/server network.

SLIP

Serial Line IP provides a method of transporting IP datagrams over a
serial connection.

SNMP

Simple Network Management Protocol; a protocol used by network
management stations to communicate management information over a
UDP/IP or IPX network.

ST Connector

An optical medium connector plug and socket.