Compaq Netelligent 3024, Netelligent 3124 User Manual

Netelligent 3024/3124

10Base-T Repeater

User Guide

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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.

iii

 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 3024/3124 10Base-T Repeater

User Guide

Second Edition (April 1996)

Part Number 185815-002

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Federal Communications Commission Notice

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 in
this manual, may cause 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 his own expense.

Class A devices bear a label indicating the interference potential of the device as well as additional
operating instructions for the user, such as the following: This device complies with Part 15 of the Federal
Communications Commission (FCC) Rules. Operation is subject to the following two conditions: (1) This
device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.

v

Canadian Department of Communications

Radio Frequency Statement

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus
set out in the Radio Interference Regulations of the Canadian Department of Communications.

Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables aux
appareils numriques de la classe A prescrites dans le Règlement sur le brouillage radioélectrique édicté par
le ministères des Communications du Canada.

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.

Emissions

This equipment complies with EMC directive 89/336/EEC (ITE), which includes EN50081-1 CLASS 1:
1992 (EN55022/CISPR 22 for Class A ITE). It also complies with FCC Class A.

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vi

European Union Notice

Products with the CE (Community European) 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:

■ EN55022 (CISPR 22) - Electromagnetic Interference

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

■ EN60950 (IEC950) - Product Safety

Safety

This equipment complies with UL 1950, Second Edition; CAN/CSA C22.2 No. 950-93, 73/23/EEC Low
Voltage Directive; TUV Rheinland EN60950, 1988; A1/1990, 1993; and A2/1992, 1992, 1993.

Immunity

This equipment complies with EMC directive 89/336/EEC (ITE), which includes EN 50082-1:

■ IEC 801-2 (Electrostatic Discharge)

■ IEC 801-3 (Radiated Immunity)

■ IEC 801-4 (Electrical Fast Transient/Burst)

■ EN55101-4 (Conducted Immunity) (not currently required)

Lithium Battery

The non-volatile RAM (NVRAM) chip on the motherboard 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 confiée à un personnel qualifié

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vii

Contents

Preface

What in This Guide?.................................................................................................ix

Chapter 1

Overview

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

Management Features.............................................................................................1-2

Technical Specifications.........................................................................................1-3

Dimensions......................................................................................................1-3

Connectors.......................................................................................................1-3

LED Indicators/Configuration Button...............................................................1-3

Environment ....................................................................................................1-4

Front Panel and Back Panel ....................................................................................1-4

Lithium Battery ......................................................................................................1-5

Chapter 2

Media Connection Options

Using the UTP Media Option and Extended Distance............................................. 2-1

Configuring Extended Distance for UTP Wiring.....................................................2-2

Using the BNC Media Option.................................................................................2-3

Using the AUI Media Option..................................................................................2-4

Using the Fiber Media Option.................................................................................2-4

Chapter 3

Setting Up the Repeater

Selecting a Location ...............................................................................................3-1

Environmental Requirements...........................................................................3-1

Electrical Requirements...................................................................................3-1

Spatial Requirements .......................................................................................3-1

Netelligent 3024/3124 10Base-T Repeater User Guide

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viii

Connecting Power...................................................................................................3-2

Self-Test.................................................................................................................3-4

UTP Cabling Considerations...................................................................................3-5

Twisted-Pair Wire Specifications.....................................................................3-5

Connecting to a Network Station...................................................................... 3-8

Stacking Repeaters..................................................................................................3-9

Disconnecting Power......................................................................................3-10

Connections Between Repeater Stacks..................................................................3-11

Chapter 4

What Is Segmentation?

Defining Ethernet Segmentation ........................................................................... `4-1

Backplanes and Segmentation.................................................................................4-2

Examples of Network Configurations......................................................................4-3

Example 1 ........................................................................................................4-5

Example 2 ........................................................................................................4-6

Example 3 ........................................................................................................4-8

Example 4 ........................................................................................................4-9

Example 5 ......................................................................................................4-10

Chapter 5

Configuring/Monitoring the Repeater

Note for HubView Users.........................................................................................5-1

Configuration Modes ..............................................................................................5-2

Port Activity Monitor (Default Mode).....................................................................5-3

Switching Between Modes...............................................................................5-4

Backplane Segment (Mode 1).................................................................................5-5

Assigning Backplane Segments........................................................................5-6

Link Integrity Enable/Disable (Mode 2)..................................................................5-7

Enabling and Disabling Link Integrity..............................................................5-8

Port Enable/Partition (Mode 3) ...............................................................................5-9

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ix

Enabling and Partitioning Ports......................................................................5-10

Chapter 6

Using the Serial COM Port

Serial COM Port.....................................................................................................6-1

Connecting to a Modem...................................................................................6-1

Local Console Interface ...................................................................................6-2

Updating Firmware..........................................................................................6-3

In-Band Management..............................................................................................6-4

Appendix A

Installing a Management Daughterboard

Requirements for the Management Daughterboard.................................................A-1

A Note About Repeater MAC Addresses................................................................A-2

Mounting the Management Daughterboard ............................................................A-3

Glossary

Netelligent 3024/3124 10Base-T Repeater User Guide

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Preface

This guide describes the configuration and installation of the Compaq
Netelligent 3024/3124 unmanaged and managing 10Base-T repeaters (Part
Numbers 267055-001 and 267060-001, respectively). It is important to review
all chapters of this publication to ensure a successful installation.

Verify that this package contains the following items:

■ 3024/3124 10Base-T repeater with factory-installed UTP media

connector

■ Power cord

■ Compag Netelligent 3024/3124 10Base-T Repeater User Guide

■ Warranty card

ix

What's in This Guide?

Chapter 1— Provices a list of product features, specifications and
requirements.

Chapter 2 — Describes the type of cabling connections available for the
TriSegment repeater.

Chapter 3 — Explains installation procedures. This chapter also details basic
UTP wiring information for workstation connections.

Chapter 4 — Provides a primer for repeater segmentation and configuration
examples.

Chapter 5 — Explains how to view repeater status, select backplane segment
assignments, enable/disable link integrity and partition/enable port
assignments.

Chapter 6 —Describes how to download software and update firmware via
the repeater's front-panel serial port. This chapter also includes information
about in-band management.

Neteilligent 3024/3124 10Base-T Repeater User Guide

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x

Preface

Appendix A — Explains how to upgrade an unmanaged repeater to a
managing repeater

Glossary — Provides a list of common terms used in the guide.

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1-1

Chapter 1

Overview

The Compaq Netelligent 3024/3124 10Base-T unmanaged and managing
repeaters provide 23 10Base-T connections and one modular connection,
which can be 10Base-T (an STP/UTP module is factory installed), Thinnet,
AUI, or Fiber (FOIRL). There are two models available:

■ 3024 10Base-T Repeater (Unmanaged), Part Number 267055-001

■ 3124 10Base-T Repeater (Managing), Part Number 267060-001

Each repeater can support up to three separate eight-port backplane segments
(separate collision domains) and each segment can stand alone or connect to
another segment. The repeater’s plug and play design lets you quickly and
easily connect up to five repeaters in a single stack. No jumpering is required.

The configuration button conveniently located on the repeater's front panel
lets you quickly and easily configure the repeater and divide port groups into
segments.

Repeater Features

The repeater includes these features:

■ 100% NetWare optimized

■ Twenty-four ports: 23 STP/UTP and one modular UTP media module.

Optional media connectors support Thinnet, AUI, and Fiber (FOIRL)
wiring.

■ Support of up to three independent, eight-port backplane segments

(collision domains) per repeater

■ Expandable to five repeater stacks, supporting up to 15 Ethernet

segments and 120 ports

■ Configuration button/LED user interface provides convenient

management on the fly by enabling the user to assign backplane
segments, enable or partition ports, and enable/disable link integrity for
each port

Netelligent 3024/3124 10Base-T Repeater User Guide

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1-2 Overview

■ Microprocessor-based self monitoring architecture (SNMP MIB) for

cost-effective, real-time management functionality via the
3124 10Base-T management repeater (Part No. 267060-001)

■ Full support for IEEE 802.3 repeater management standard

■ Diagnostic LEDs provide at-a-glance collision activity (per eight-port

segment), link status (per port), partition status (per port) and
backplane segment assignments (per eight-port segment)

■ Compatible with Compaq's HubView Management Software and

Novell's NetWare Hub Services (HUBCON) and Hub Services
Manager (NMS/HMI)

■ Complete 802.3 repeater with built-in retiming

■ Non-volatile memory to hold configuration information in case of a

power failure

■ Flash PROM for firmware updates

Management Features

The repeater provides a configuration button interface to let you perform a
variety of network management activities, including:

■ Assigning backplane segments to port groups

■ Partitioning ports and viewing port activity

■ Enabling and disabling link integrity

In addition, the managing repeater has the following management capabilities:

■ One 3124 10Base-T managing repeater can manage an entire stack

(containing up to four 3024 10Base-T unmanaged repeaters) via its on­board SNMP agent and Compaq's Redirector, an HMI-compliant agent

■ Flash PROM updates for the entire stack via the local serial port

■ Manageable via Novell's NMS, Compaq's HubView, or other SNMP-

based management platform

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1-3

Technical Specifications

Dimensions:

■ 1.75 x 17.00 x 8.35 inches (4.45 x 43.18 x 21.21 centimeters)

(HxWxD)

Connectors

■ Two 68-pin female connectors for connecting multiple repeaters

■ Twenty-four built-in female RJ-45 connectors for STP/UTP wiring

■ One female 20-pin RJ-45 media board

■ One male DB-9 serial port (3124 10Base-T managing repeater only)

■ Optional media expansion connectors, plus the following three optional

media modules for alternative cabling:

❏ AUI connector for Thicknet (Part Number 267063-001)
❏ BNC connector for Thinnet (Part Number 267064-001)
❏ One pair of FOIRL-compatible ST connectors (Part Number

267065-001)

LED Indicators/Configuration Button

■ Three collision/mode indicators

■ Configuration button switch for mode select

■ 24 multi-function LED indicators
❏ link status/activity
❏ partition status
❏ port enable/partition
❏ link integrity enable/disable

Netelligent 3024/3124 10Base-T Repeater User Guide

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1-4 Overview

❏ backplane segment assignment

Environment

■ Storage: 40° to 151° F; 40° to 66° C; 5% to 95% humidity (non-

condensing); 0 to 30,000 feet altitude; 0 to 9 kilometers

■ Operating Environment: 32° to 120° F; 0° to 49° C; 5% to 95%

humidity (non-condensing)

Front Panel and Back Panel

The following are examples of a repeater front panel and back panel with
some applicable components identified:

Factory Installed

UTP Module

Serial

Port

MEDIA EXPANSION

PORT

(3124 Managing Repeaters Only)

Collision 1

Mode 1

3

2

1 12

4 15 19 23

Optional Media Connectors

AUI

(Thicknet)

BNC

(Thinnet)

Figure 1-1. Repeater Front Panel

Serial Port

5

6

7

Fiber

(FOIRL)

Collision 2

Mode 2

8

Port/Segment

Configuration

Button

Collision 3

Mode 3

10

13

11

SEGMENT 2 SEGMENT 3SEGMENT 1

16

14

17

18

Mode 1 - BACKPLANE
Mode 2 - LINK DISABLE
Mode 3 - PARTITION

20

21

PORT/SEGMENT
CONFIGURATION

229

24

UPLINK
PORT24

Uplink Switch

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1-5

Fan

Power Cord Connector

EXPANSION PORTS

IN OUT

68-pin Connectors

for Connecting

up to five

3024/3124 Repeaters

Figure 1-2. Repeater Back Panel

Lithium Battery

For information about the lithium battery, see the “Notice” section of this
guide.

Netelligent 3024/3124 10Base-T Repeater User Guide

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2-1

Chapter 2

Media Connection Options

The repeater comes with a modular UTP media module that enables Port 1 to
function as a UTP connection. Optional media connectors (sold separately)
include:

■ AUI (Thicknet), Part Number 267063-001

■ BNC for Thinnet, Part Number 267064-001

■ Fiber (FOIRL), Part Number 267065-001

Factory installed

UTP faceplate

(enables Port 1 to

act as UTP connection)

Figure 2-1. Optional Media Connectors

Thicknet

(P/N 267063-001)

Optional Media Connectors

Using the UTP Media Option and
Extended Distance

The repeater comes with a UTP connector board installed. This media option
enables Port 1 on the repeater to function as the UTP media connection, and
by default, the board is configured to support normal cable distance. If UTP
wiring is used at normal distances, the repeater is ready to operate without
changing media connector options or jumper settings.

However, if it is necessary to configure the repeater to support extended cable
distance, move the jumper settings on the UTP media connector board. The
extended distance feature is not available with the AUI, Fiber, or BNC media
options.

Thinnet

(P/N 267064-001)

FOIRL

(P/N 267065-001)

NOTE: Normal distance is 100 meters (328 feet) with UTP cable and extended
distance is up to 150 meters (592 feet) on standard telephone UTP or 200 meters
(656 feet) on AT&T high-performance cable, e.g., SYSTIMAX 2061. Both ends of
the connection must support the extended distance feature.

Netelligent 3024/3124 10Base-T Repeater User Guide

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2

-2 Media Connection Options

Configuring Extended Distance for UTP
Wiring

To set the extended distance on the UTP connector board, follow these steps:

1. Remove the two screws from the media connector faceplate and
carefully pull out the board.

2. Set the AW1 jumpers as shown in the figure below.

EXT

NORM

AW1

AW1

Standard

UTP

(default)

Figure 2-2. Extended Distance Jumper AW1

3. Replace the UTP media connector board, firmly connecting the 20- pin

male connector to the repeater's motherboard and tighten the faceplate
screws.

Extended

Distance

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2-3

Using the BNC Media Option

To connect the repeater to a Thinnet backbone, use the optional BNC media
connector (Part Number 267064-001). If the BNC port does not physically
connect to a cable, the connector board jumper must be set to disable the port
(default setting). An external terminator can also be used on this port. If a
terminator is used, set the jumper to the ON position for future connections.

NOTE: If there is no connection or external terminator at the BNC port, you must
set the jumper to OFF; otherwise the repeater will experience excessive collisions
that will adversely affect network performance.

The figure below shows the AW1 jumper settings.

ON

OFF

AW1

AW1

BNC
disabled
(default)

Figure 3-3. BNC Jumper AW1

To install the BNC media connector, follow these steps:

1. Remove the two screws from the media connector faceplate and
carefully pull out the factory installed UTP module board.

2. Verify that the BNC board jumpers are set correctly (ON enables the
connection, OFF disables the connection).

BNC

enabled

Netelligent 3024/3124 10Base-T Repeater User Guide

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2

-4 Media Connection Options

3. Insert the BNC media connector board, firmly connecting the 20-pin
male connector to the repeater's motherboard and tighten the faceplate
screws.

Using the AUI Media Option

Use the AUI media connector (Part Number 267063-001) to connect the
repeater to a Thicknet backbone. To install the AUI connector:

1. Remove the two screws from the media connector faceplate and
carefully pull out the factory installed UTP module board.

2. Insert the AUI media connector board, firmly connecting the 20- pin
male connector to the repeater's motherboard.

3. Tighten the faceplate screws.

NOTE: There are no jumper settings for this optional board.

Using the Fiber Media Option

Use the fiber media connector (Part Number 267065-001) to connect the
repeater to a FOIRL backbone. To install the fiber connector:

1. Remove the two screws from the media connector faceplate and
carefully pull out the factory-installed UTP module board.

2. Insert the AUI media connector board, firmly connecting the 20-pin
male connector to the repeater's motherboard.

3. Tighten the faceplate screws.

NOTE: There are no jumper settings for this optional board.

WARNING: Observing the transmitter output power (port) on the fiber

module under magnification may cause injury to the eye. When viewed with
the unaided eye, the infrared output is radiologically safe. However, when
viewed under magnification, precaution should be taken to avoid exceeding
the limits recommended in ANSI Z136.1-1981.

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3-1

Chapter 3

Setting Up the Repeater

This chapter provides the basic requirements for setting up the repeater. This
includes environmental, electrical, and spatial requirements, as well as UTP
cabling considerations. The chapter also explains how to stack repeaters and
how to connect stacks to each other.

Selecting a Location

You can place the repeater on a level surface (for example, a desktop or
cabinet) or mount it in a 19-inch rack using a rack mounting kit. Before you
select a location for the repeater, read this section to determine the
environmental, electrical, and spatial requirements.

Environmental Requirements

Be sure the temperature, humidity, and altitude of the intended operating
environment for the repeater is within the following ranges:

■ Temperature: 32º to 120º F (0º to 49º C)

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

■ Altitude: 0 to 10,000 feet (0 to 3 kilometers)

Electrical Requirements

Be sure there is a commercial power outlet within 6 feet (1.8 meters) of the
repeater. If there is not, use a power strip or grounded extension cord to
extend the range of the power cable.

Netelligent 3024/3124 10Base-T Repeater User Guide

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3-2 Setting Up the Repeater

WARNING: The power outlet must be a non-switched, 3-pronged,

grounded outlet. Do not use a 3-to-2 pronged adapter at the outlet; using
this type of adapter may result in electrical shock and/or damage to the
repeater. Using the 3-to-2 adapter will also void the repeater's warranty.

The electrical requirements for the repeater are as follows:

Table 3-1

Electrical Requirements

Setting Requirements
Voltage

100 to 130 VAC*

* The repeater's power supply automatically adjusts to the incoming power.

Spatial Requirements

The repeater's dimensions are: 1.75 x 17.00 x 11.65 inches (4.44 x 43.18 x

29.6 cm) (HxWxD). When you set the repeater on a level surface, allow at

least 2 inches (5.1 centimeters) on each side of the repeater for proper air
circulation. Leave at least 2 feet in front of the repeater to allow access for
connections.

Connecting Power

Follow these steps to connect the repeater to power:

1. Plug the power cord into the power connector on the back of the
repeater. The lip on the power connector faces the top of the repeater.

Frequency

Current

60 to 50 Hz

0.21 to 0.1 Amps maximum

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3-3

Power cord connector

EXPANSION PORTS

IN OUT

Lip of the power plug

must be pointing to

the top of the hub

Figure 3-1. Connecting the Power Cord

2. Insert the three-pronged plug on the power module cable into an easily

accessible, grounded power outlet on the wall, a power strip, or a
grounded extension cord.

To power off the repeater, disconnect the power cord from the wall
outlet first. Do not disconnect the female connector from the repeater
to power off the repeater.

NOTE: For pluggable equipment, the power outlet must be installed near the
equipment and must be easily accessible.

3. Once the repeater is powered on, be sure the LEDs perform the self-test

to indicate that the repeater is operating correctly. See the “Self-Test”
section in this chapter.

Netelligent 3024/3124 10Base-T Repeater User Guide

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3-4 Setting Up the Repeater

Self-Test

When a repeater is powered on, it performs a self-test. If the test is successful,
all the LEDs flash yellow, then green, indicating that repeater is operating
properly and had no failures.

If the test is not successful, the LEDs do not flash, indicating some type of
failure. You can diagnose the failure by viewing the first three port LEDs on
the front panel. The following diagram shows the types of failures that can
occur and how you can identify them.

Self-Test

LEDs

Serial

Port

MEDIA EXPANSION

PORT

Collision 1

Mode 1

1 12

5

3

2

6

4 15 19 23

ROM Test

Failure

2

OFF

3

OFF

1

ON

Non-volatile

Test Failure

2

OFF

3

ON

1

OFF

HIMIB 3

Test Failure

2

ON

3

ON

1

ON

Collision 2

Mode 2

7

8

10

13

11

SEGMENT 2 SEGMENT 3SEGMENT 1

Internal RAM

Test Failure

2

ON

3

OFF

1

OFF

HIMIB 1

Test Failure

2

OFF

3

ON

1

ON

Collision 3

Mode 3

16

17

14

18

Mode 1 - BACKPLANE

PORT/SEGMENT
CONFIGURATION

Mode 2 - LINK DISABLE
Mode 3 - PARTITION

20

21

229

24

UPLINK
PORT24

External RAM

Test Failure

2

ON

3

OFF

1

ON

HIMIB 2

Test Failure

2

ON

3

ON

1

OFF

Figure 3-2. Self-Test LEDs

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3-5

UTP Cabling Considerations

This section outlines twisted-pair wire specifications and describes how to
make a simple direct connection between a repeater and a workstation.

Twisted-Pair Wire Specifications

The twisted-pair wiring must meet the following minimum specifications and
requirements to ensure long-term LAN reliability. If the wiring does not meet
these specifications and requirements, you may need to install new twisted­pair wiring.

■ The wiring must be shielded or unshielded twisted-pair (STP/UTP).

■ Two pairs of wiring are required. Depending on building codes,

different insulation materials may be required. Plenum-rated or
TEFLON-coated wiring may be required in some areas.

■ The UTP wire should meet the following specifications:
❏ Solid copper
❏ Nominal capacitance — Less than 16pF/ft
❏ Nominal impedance — 100 Ohms
❏ Nominal attenuation — Less than 11.5db between 5.0 and 10 MHz
❏ Wire gauge — Between 18 and 26 AWG (American Wire Gauge).

(Most telephone installations use 24-gauge wiring.)

❏ Wire length — Within the maximum distance requirements, 100

meters standard (328 feet), 200 meters extended (656 feet). This
distance must include all cross-connect wire, wire in the walls, and
any drop cables from wall plates to workstations.

NOTE: Maximum distances may be reduced for UTP cables run underground,
in conduits, or in large cable bundles.

■ In general, the repeater is compatible with all AT&T Type D wiring

(D-Inside wiring) and AT&T PDS wiring. The repeater will also
operate with IBM Type 1 (two inner conductors) wiring.

Netelligent 3024/3124 10Base-T Repeater User Guide

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3-6 Setting Up the Repeater

■ The wiring must be in good condition and the insulation should not be

frayed or worn.

The simplest way to connect a workstation to a repeater is with AT&T Type D
wiring (D-Inside wiring). D-Inside wiring is convenient to use when you
connect workstations that are located with the repeater. There are two types of
D-Inside wiring that will work with the repeater: DW8, which is stranded wire
and more flexible; and D8W, which has solid conductors and is less flexible.

Typically, DW8 is used for shorter runs (less than 50 feet, 15.25 meters)
within the same room. D8W wire is used for longer runs and is usually run
through ceilings and/or behind the walls.

The connection between a repeater and a workstation is straight-through, four­pair D-Inside wiring (only two pairs are actually used by the repeater) as
shown in the following figures:

Brown-White 8
White-Brown 7

Green-White 6

Blue-White 5
White-Blue 4

White-Green 3
Orange-White 2
White-Orange 1

Figure 3-3. D-Inside Wire Example

Plug Pin # Plug Pin #

1
2

3
6

Figure 3-4. Receive/Transmit Pair

Transmit Pair

Receive Pair

1 White-Orange
2 Orange-White
3 White-Green
4 White-Blue
5 Blue-White
6 Green-White
7 White-Brown
8 Brown-White

1
2

3
6

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3-7

With this type of cable, the wire connected to Pin 1 must be twisted with the
wire connected to Pin 2 and the wire connected to Pin 3 must be twisted with
the wire connected to Pin 6 as shown above. Pins 4, 5, 7 and 8 are reserved
for telephone and other services.

Each RJ-45 port has the following 10Base-T standard pin-out:

Table 3-2

Standard 10Base-T Pinout

Repeater Pin # Signal Description

1 TD+
2 TD­3 RD+
6 RD-

A straight-through cable using the pair combinations shown above provides
the appropriate 10Base-T connection between the repeater and the
workstation.

Netelligent 3024/3124 10Base-T Repeater User Guide

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3-8 Setting Up the Repeater

Connecting to a Network Station

To connect the repeater to a network station, perform the following steps:

CAUTION: Never use gray satin station cables for connecting to a
repeater. This is a flat cable that is typically used for connecting telephones
to wall jacks and is incompatible with 10Base-T systems.

1. Verify that the UTP Media Expansion faceplate or optional media
connector is installed. If extended distance is used, verify that the
jumper is set correctly according to the instructions in Chapter 2.

2. Plug one end of the modular cord into a 10Base-T compatible network
station.

3. Plug the other end of the modular cord directly into the desired port on
the repeater.

Figure 3-5. Connecting to a Network Station

Remember, the maximum end-to-end cabling distance is 100 meters (328 feet)
unless both ends of the connection support extended distance.

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3-9

Once the network station and the repeater are connected and powered on, the
corresponding LINK LED should light on the repeater. If the corresponding
LINK LED does not light, check the network cabling for proper connections.

NOTE: Some manufacturers of 10Base-T network interface cards do not provide a
link integrity signal until the software driver has been loaded and the card
initializes. Check with the Network Interface Card manufacturer to determine if
driver initialization is required for proper link integrity operation (Compaq's NICs do
not have to be initialized to provide the link integrity signal).

CAUTION: Never use gray satin station cables for connecting to a
repeater. This is a flat cable that is typically used for connecting
telephones to wall jacks and is incompatible with 10Base-T
systems.

Stacking Repeaters

Using a media expansion cable (sold separately), you can expand your
network by connecting together repeaters (up to five in a stack) via the 68-pin
connector on the repeater backplate. (A separate cable is required for each
connection.) One managing 3124 10Base-T repeater (Part Number 267060-

001) can manage all repeaters in a stack (up to 15 Ethernet segments). The

following illustration shows five repeaters in a single stack.

Netelligent 3024/3124 10Base-T Repeater User Guide

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3-10 Setting Up the Repeater

EXPANSION PORTS

IN

EXPANSION PORTS

IN

EXPANSION PORTS

IN

EXPANSION PORTS

IN

EXPANSION PORTS

IN

OUT

OUT

OUT

OUT

OUT

Figure 3-6. Repeaters Connected via the Media Expansion Cable

Disconnecting Power

When you reconfigure a stack (add new repeaters, remove repeaters, or
change repeater positions), be sure you disconnect the power cords from all
affected repeaters.

WARNING: Do not connect or disconnect the media expansion cables
while the repeaters are powered on. Be sure the repeaters are powered off
before you move the cables.

To power off the repeater, disconnect the power cord from the wall outlet
first. Do not disconnect the power cord from the repeater to power off the
repeater.

CAUTION: For pluggable equipment, the power outlet must be installed
near the equipment and must be easily accessible.

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3-11

Connections Between Repeater
Stacks

Larger systems require more than one stack. You can connect stacks together
using twisted-pair wiring, fiber cable, or coaxial cable. This section explains
how to connect stacks using twisted-pair wiring.

Port 24 of each repeater can function as an uplink port that allows the repeater
to connect to an adjacent repeater. An uplink switch on the repeater's front
panel (Figure 3-7) lets you convert the 24th port from an output port to an
input port.

Serial

Port

MEDIA EXPANSION

PORT

Collision 1

Mode 1

2

1 12

Uplink enabled

Uplink disabled

(default)

Figure 3-7. Uplink Switch

The default setting for the uplink switch is disabled. To enable the uplink
function, use a small, flat-blade screwdriver to turn the switch to the left until
the arrow on the switch aligns with the enable mark (X). The repeater is now
ready to connect to another stack, as described on the next page.

Collision 2

Mode 2

5

3

6

4 15 19 23

7

10

8

13

11

SEGMENT 2 SEGMENT 3SEGMENT 1

Collision 3

Mode 3

16

14

17

20

18

UPLINK

PORT 24

Mode 1 - BACKPLANE
Mode 2 - LINK DISABLE
Mode 3 - PARTITION

21

PORT/SEGMENT
CONFIGURATION

229

24

UPLINK
PORT24

Figure 3-8 shows an uplink configuration where the repeaters in Stacks B and
C are uplinked to Stack A.

Netelligent 3024/3124 10Base-T Repeater User Guide

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3-12 Setting Up the Repeater

Stack A

Stack B Stack C

Figure 3-8. Uplink Connections

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4-1

Chapter 4

What Is Segmentation?

This chapter provides an introduction to segmentation and contains a variety
of network configuration examples to illustrate the segmentation concept. Be
sure you read this chapter before you configure the repeater.

Defining Ethernet Segmentation

Ethernet segmentation does exactly what the name implies: it divides existing
Ethernet networks into smaller networks, or segments, with fewer users. These
segments maintain separate collision domains. Therefore, fewer users compete
for bandwidth on each domain, reducing collisions and increasing network
throughput.

The repeater's distributed design enables its 24 ports to be separated into three
eight-port groups, and each group can be assigned to a separate segment (see
Figure 4-1). You can also combine or separate port groups into multiple
backplane segments. See “Backplanes and Segmentation.” You can connect
(stack) up to five repeaters to support up to 15 independent segments and 120
ports of connectivity.

Netelligent 3024/3124 10Base-T Repeater User Guide

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Marketing Ethernet Network

Accounting Ethernet Network

4-2 What is Segmentation?

on Segment 1

Figure 4-1. Ethernet Segmentation

Engineering Ethernet Network

on Segment 2

on Segment 3

Backplanes and Segmentation

A backplane is the data bus connection that interconnects different network
communication devices. The repeater can access two different types of
backplane segments:

■ Standard—All repeaters can access five standard backplane segments.

The repeater can share Backplane Segments 1-5 with all other repeaters
in the stack.

■ Local—Repeaters have three additional local (isolated) backplane

segments (that is, these independent backplane segments cannot
communicate with other repeaters in the stack nor with other segments
in the repeater; the eight ports in that segment can only communicate
with each other). Backplane Segments 6-8 are confined to an
individual repeater and cannot be shared with any other repeaters in the
stack.

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4-3

The repeater expands typical backplane technology by letting you combine
and/or separate port groups into multiple backplane segments. For example, a
single repeater can configure its three port groups (1-8, 9-16, and 17-24) to a
separate backplane segment. And, if the repeaters are stacked (up to five per
stack), you can assign various port groups from each repeater to up to five
backplane segments (via standard backplane connections), or you can assign
each port group to up to 15 independent networks (via the local backplane).

Backplane segment assignments are represented by the 24 port LEDs on the
repeater's front panel. For instructions about using the configuration button to
assign backplane segments, see “Assigning Backplane Segments” in chapter

5. Table 4-1 shows the LED representations for backplane segment

assignments.

Table 4-1

Backplane Segment Assignments

Port Group
(Ports 1-8)

LED 1=Standard Segment 1 LED 9=Standard Segment 1 LED 17=Standard

LED 2=Standard Segment 2 LED 10=Standard Segment 2 LED 18=Standard

LED 3=Standard Segment 3 LED 11=Standard Segment 3 LED 19=Standard

LED 4=Standard Segment 4 LED 12=Standard Segment 4 LED 20=Standard

LED 5=Standard Segment 5 LED 13=Standard Segment 5 LED 21=Standard

LED 6=Standard Segment 6 LED 14=Standard Segment 6 LED 22=Standard

LED 7=Standard Segment 7 LED 15=Standard Segment 7 LED 23=Standard

LED 8=Standard Segment 8 LED 16=Standard Segment 8 LED 24=Standard

Port Group

(Ports 9-16)

Port Group

(Ports 17-24)

Segment 1

Segment 2

Segment 3

Segment 4

Segment 5

Segment 6

Segment 7

Segment 8

Netelligent 3024/3124 10Base-T Repeater User Guide

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4-4 What is Segmentation?

Examples of Network Configurations

The following sections of this chapter provide examples of network
segmentation. For actual configuration instructions, see chapter 5.

The following example are presented:

■ Assigning different backplane segments for each port group

■ Assigning port groups to standard backplane segments

■ Assigning multiple backplane segments

■ Creating separate networks via backplane segment connections

■ Assigning port groups to independent local backplane segments

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4-5

Example 1

Figure 4-2 shows that each port group in a single repeater (labeled SEGMENT
1, SEGMENT 2, and SEGMENT 3) can be assigned to a different backplane
segment (1-8).

1

2
3

4
5

6
7
8

SEGMENT 2 SEGMENT 3SEGMENT 1

Figure 4-2. Assigning Different Backplane Segments for Each Port Group

The table below describes how the repeater in this example is configured:

Table 4-1

Example 1, Backplane Assignments

Port Group Backplane

Segment

1 3 Ports 1-8 can communicate with each other, but

not with any other ports in the repeater.

2 7 Ports 9-16 can communicate with each other,

but not with any other ports in the repeater.

3 1 Ports 17-24 can communicate with each other,

but not with any other ports in the repeater

Description

Netelligent 3024/3124 10Base-T Repeater User Guide

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1
2

4-6 What is Segmentation?

Example 2

Figure 4-3 shows a stack of five repeaters. Each port group in the stack is
assigned to one of five standard backplane segments. Notice that port groups
from one repeater are combined with port groups from other repeaters to
create a network over a shared backplane segment.

3
4
5

Repeater 1

Repeater 2

Repeater 3

Repeater 5

Repeater 4

3024/3124 Repeater Stack

Figure 4-3. Assigning Port Groups to Standard Backplane Segments

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4-7

The table below describes how the repeater in this example is configured:

Table 4-2

Example 2, Backplane Segments

Backplane

Segment

1 Repeaters 1-5 all have Port Group 3 (SEGMENT 3) assigned to Backplane

Segment 1. This means there are up to 40 ports available on this network.

3 Repeaters 1-5 all have Port Group 2 (SEGMENT 2) assigned to Backplane

Segment 3. This means there are up to 40 ports available on this network.

5 Repeaters 1-5 all have Port Group 1 (SEGMENT 1) assigned to Backplane

Segment 5. This means there are up to 40 ports available on this network.

Description

Netelligent 3024/3124 10Base-T Repeater User Guide

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1
2

4-8 What is Segmentation?

Example 3

Figure 4-4 shows a repeater stack with a variety of backplane segment
assignments. Some port groups in the stack are assigned to one of the five
standard backplane segments; other port groups use local backplane segments.
Notice that port groups from one repeater are combined with port groups from
other repeaters to create a network over a shared backplane segment, while
other port groups are isolated to independent local backplane segments.

3
4
5

6
7
8

6
7
8

6
7
8

6
7
8

Repeater 5

6
7
8

Repeater 4

3024/3124 Repeater Stack

Repeater 3

Repeater 2

Repeater 1

Figure 4-4. Assigning Multiple Backplane Segments

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1
2

4-9

Example 4

Figure 4-5 shows various port groups combined and separated into five
separate networks via the standard backplane segment connections.

Additionally, a sixth network is created by using the uplink connections and
local backplane segments on three of the stacked repeaters and a separate
single repeater. Port Group 3 on Repeaters 3, 4 and 5 all use Local Backplane
Segment 6 which is shared with the extra repeater.

For uplink information, refer to chapter 3.

3
4
5

Repeater 1

6
7
8

6
7
8

3024/3124 Repeater Stack

6
7
8

Repeater 4

Repeater 5

Repeater 3

Repeater 2

Other Repeater

(not in the stack)

Figure 4-5. Creating Separate Networks Via Backplane Segment Connections

Netelligent 3024/3124 10Base-T Repeater User Guide

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4-10 What is Segmentation?

Example 5

Figure 4-6 shows a configuration where each port group is assigned to an
independent local backplane segment. There are 15 individual segments and
each segment can support up to eight ports.

6
7
8

6
7
8

Repeater 2

6
7
8

Repeater 5

6
7
8

Repeater 4

6
7
8

Repeater 3

3024/3124 Repeater Stack

Figure 4-6. Assigning Port Groups to Independent Local Backplane Segments

Repeater 1

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5-1

Chapter 5

Configuring/Monitoring the
Repeater

You can perform the following network configuration operations using the
front-panel configuration button of the repeater :

■ Separate or combine eight-port groups into independent backplane

segments (local or standard)

■ Enable and partition ports

■ Enable or disable link integrity status for each port

Figure 5-1 shows the three mode LEDs and the configuration button.

Mode

LEDs

Serial

Port

MEDIA EXPANSION

PORT

Collision 1

Mode 1

5

3

2

1 12

4 15 19 23

Collision 2

Mode 2

6

7

10

8

11

SEGMENT 2 SEGMENT 3SEGMENT 1

Figure 5-1. Repeater Mode LEDs and Configuration Button

Configuration

button

Collision 3

Mode 3

20

13

16

14

17

18

21

229

24

UPLINK

PORT24

Netelligent 3024/3124 10Base-T Repeater User Guide

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5-2 Configuring/Monitoring the Repeater

Note for HubView Users

In addition to configuring the repeater with its configuration button, you can
also configure the repeater from a management station that is running
Compaq's HubView Network Management System. If HubView manages the
repeater, refer to the HubView documentation for more information.

NOTE: HubView lets you disable the repeater's configuration button so that
configuration is possible only via HubView. If you later want to allow configuration
from the repeater's front panel, you can re-enable the configuration button.

Configuration Modes

The repeater has four modes of operation:

■ Default Mode, Port Activity: This mode displays collision activity for

each port group. It also shows the current link, partition and port
activity for each port.

■ Mode 1, Backplane Segment: This mode displays the current

backplane segment assignment for each port group and lets you change
backplane segment assignments.

■ Mode 2, Link Integrity: This mode shows the link integrity status of

each port and lets you disable or enable link integrity.

■ Mode 3, Enable/Partition Port: This mode shows which ports are

currently enabled or partitioned and lets you enable or partition ports.

Figure 5-2 identifies each mode and provides a quick reference for mode
functionality.

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5-3

Port Activity Monitor (Default)

Collision/Mode 3 LED

GREEN - port enable/partition
mode is active

Port LEDs (1-24)

OFF - port enabled
YELLOW - port partitioned

Collision/Mode LEDs (1-3)

OFF - no collision activity
BLINKING YELLOW - collision activity

Mode 3 Mode 1

Link Integrity

Collision/Mode 2 LED

GREEN - link integrity mode is active

Port LEDs (1-24)

Default

Mode 2

Port LEDs (1-24)

GREEN - link pass
OFF - link fail
YELLOW - port partitioned
BLINKING YELLOW - port activity

Backplane SegmentPort Enable/Disable

Collision/Mode 1 LED

Port LEDs (1-24)

OFF - link integrity enabled
GREEN - link integrity disabled

GREEN - backplane segment
mode is active

GREEN - shows the backplane
segment number (1-8) for each
port group

Ports 1-8: Port Group 1
Ports 9-16: Port Group 2
Ports 17-24: Port Group 3

Figure 5-2. Configuration Modes

Port Activity Monitor (Default Mode)

When the repeater is powered on, it is automatically in the Port Activity
Monitor mode (default). This mode shows collision activity for each port
group and various statuses for each port. You cannot change any repeater
configuration in this mode. (To change the repeater's configuration, access
Modes 1-3 as described later in this chapter.)

The table below explains LEDs and their corresponding statuses:

Netelligent 3024/3124 10Base-T Repeater User Guide

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5-4 Configuring/Monitoring the Repeater

Table 5-1

Repeater LEDs

LEDs Description

Collision/Mode 1-3 OFF

Ports 1-24 OFF

Switching Between Modes

When a mode is activated, the corresponding Mode/Collision LED (1-3) is
GREEN. If the repeater is in default mode, none of the Collision/Mode LEDs
are GREEN. The only color the LEDs can display in the default mode is
blinking YELLOW (indicating port group collision activity).

The repeater's default mode is the Port Activity Mode. From this mode, you
can select the other three modes as follows:

1. From the default mode, press the configuration button once to access
Mode 1. Press the button once more to access Mode 2. Press the button
a third time to access Mode 3.

Collision/Mode 1-3

GREEN
YELLOW
BLINKING GREEN

No collision activity for port group

Link fail
Link pass
Port partitioned
Port activity

2. From Mode 3, press the button once more to return to the default
mode.

The flexibility of the repeater's configuration button lets you both view and
change various statuses and configurations. Once you select a mode (1-3), the
LEDs display the current settings for that mode. For example, if the Port
Enable/Partition mode (Mode 3) is selected, all the LEDs that represent the
ports that are currently partitioned display a YELLOW light. You can then
change the configuration to partition or enable ports.

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5-5

Backplane Segment (Mode 1)

When the Backplane Segment mode is selected, the Collision/Mode LED 1 is
GREEN. The LEDs for ports 1-24 display the current backplane segment
selection for each eight-port group.

Collision/Mode 1 LED displays

a constant GREEN light

Collision 1

Mode 1

2

1

1

3

3

2

BACKPLANE SEGMENT

5

4

5

4

Port Group 1 Port Group 2 Port Group 3

Port Group 1 is assigned
to Backplane Segment 2.

Port Groups 1 and 2 share

the same backplane segment.

Figure 5-3. Mode 1 Example

The table below explains the LEDs and their corresponding statuses:

LED LED Color Description

Collision 2

Mode 2

6

7

8

6

7

8

10

2

1

12

11

BACKPLANE SEGMENT

Port Group 2 is also assigned

to Backplane Segment 2.

Port Groups 1 and 2 share

the same backplane segment.

13

14

64

53

Collision 3

Mode 3

15 19 23

16

17

18

7

8

2

1

20

21

BACKPLANE SEGMENT

Port Group 3 is assigned
to Backplane Segment 7.

53

229

64

24

7

8

Table 5-2

Mode 1 Example

Collision/Mode 1 GREEN Backplane Segment mode is active
Ports 1-8 GREEN Shows current backplane segment for Port Group 1
Ports 9-16 GREEN Shows current backplane segment for Port Group 2
Ports 17-24 GREEN Shows current backplane segment for Port Group 3

You can assign port groups on the repeater to two different types of backplane
segments:

■ Standard—All Compaq repeaters can access five standard backplane

segments. The repeaters can share Backplane Segments 1-5 with all
other repeaters in the stack.

Netelligent 3024/3124 10Base-T Repeater User Guide

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Backplane

Segment

1

2

3

4

5

6

7

8

5-6 Configuring/Monitoring the Repeater

■ Local—Repeaters have three additional, local (isolated) backplane

segments. Backplane Segments 6-8 are confined to one particular
repeater and cannot be shared with any other repeaters in the stack.

NOTE: The numbers below the port LEDs (1-24) represent the port number, not the
backplane segment number for each port group.

The table below lists each LED and its associated backplane segment number
for each port group.

Table 5-3

Port Group Assignments

Port LED Backplane

Segment

119 1 17
2210 2 18
3311 3 19
4412 4 20
5513 5 21
6614 6 22
7715 7 23
8816 8 24

Port LED Backplane

Assigning Backplane Segments

Each port group of the repeater is set to Backplane Segment 1 at the factory.
To change a backplane segment assignment for a port group, perform the
following steps:

Port LED

Segment

1. Read through this procedure once before you change backplane
segment assignments.

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5-7

2. From the default mode, press the configuration button once. The Mode
1 LED displays a steady GREEN light.

3. Press and hold down the button until the Mode 1 LED begins blinking
GREEN. Then release the button.

4. While the Mode 1 LED is blinking, press and hold down the button.
(The LED blinks only for a few seconds before returning to the default
mode.)

A YELLOW cursor starts to scroll through the Port 1-24 LEDs.
Release the button when the cursor reaches the LED that corresponds
to the desired backplane segment number for Port Group 1. The
selected LED blinks YELLOW.

5. Press and release the button once again to store the selection. The LED

alternately blinks YELLOW and GREEN to indicate that the selection
has been stored.

6. Repeat Steps 4 and 5 to select backplane segments for Port Groups 2
and 3.

7. Once all backplane segment selections are made, press and hold down
the button until the Mode 1 LED blinks GREEN. The mode LED stops
blinking after several seconds.

8. To return to the default mode, press the configuration button three
times

Netelligent 3024/3124 10Base-T Repeater User Guide

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Collision/Mode 2 LED displays

5-8 Configuring/Monitoring the Repeater

Link Integrity Enable/Disable
(Mode 2)

Most pre-10Base-T equipment does not support link integrity. If a port
connects to such equipment, you should disable link integrity. The
configuration button lets you disable or enable link integrity.

When you select the Link Integrity mode, the Collision/Mode LED 2 is
GREEN. The LEDs for ports 1-24 display the current link integrity status for
each eight-port group.

a constant GREEN light

Collision 1

Mode 1

3

2

1 12

5

4 15 19 23

6

Collision 2

Mode 2

7

8

Figure 5-4. Mode 2 Example

The table below describes the Mode 2 LEDs:

10

11

GREEN light indicates that link integrity

is DISABLED on ports 3, 14 and 23

13

14

Collision 3

Mode 3

16

20

21

17

18

229

24

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5-9

Table 5-4

Mode 2 Example

LED LED Color Description

Collision/Mode 2 GREEN Link Integrity mode is active
Ports 1-24 OFF

Enabling and Disabling Link Integrity

Each repeater port is set at the factory to enable link integrity. To change the
link integrity status for a port, perform the following steps:

1. Read through this procedure once before you change the link integrity
configuration.

2. From the default mode, press the configuration button twice. The Mode
2 LED displays a steady GREEN light.

3. Press and hold down the button until the Mode 2 LED begins blinking
GREEN. Then release the button.

4. While the Mode 2 LED is blinking, press and hold down the button.
(The LED blinks only for a few seconds before the repeater returns to
the default mode.) A YELLOW cursor starts to scroll through the Port
1-24 LEDs. Release the button when the cursor reaches the LED that
corresponds to the port you want to change. The LED blinks
YELLOW.

GREEN

Link integrity enabled
Link integrity disabled

5. Press and release the button once again to store the selection. The LED

alternately blinks YELLOW and GREEN to indicate the repeater has
stored selection.

6. Repeat Steps 4 and 5 to disable additional ports.

7. Once all the changes are made, press and hold down the button until
the Mode 2 LED blinks GREEN. The mode LED stops blinking after
several seconds

Netelligent 3024/3124 10Base-T Repeater User Guide

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Collision/Mode 3 LED displays

5-10 Configuring/Monitoring the Repeater

8. To return to the default mode, press the configuration button two times.

NOTE: To enable link integrity to a disabled port, perform the above procedure. At
Step 5, the LED alternately blinks YELLOW and OFF to indicate that the selection
has been stored.

Port Enable/Partition (Mode 3)

If a port is partitioned, it is electronically disconnected from the network (that
is, it cannot transmit or receive data). The port remains physically attached,
but does not communicate with the network. Use the configuration button to
partition or enable ports.

When you select the Port Enable/Partition mode, the Collision/Mode LED 3 is
GREEN. The LEDs for ports 1-24 display the current port status.

Collision 1

Mode 1

3

2

1 12

5

4 15 19 23

6

Collision 2

Mode 2

7

8

Figure 5-5. Mode 3 Example

a constant GREEN light

10

11

ports 4, 10 and 23 are PARTITIONED

13

YELLOW light indicates that

Collision 3

Mode 3

20

16

14

17

18

21

229

24

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5-11

The table below describes the Mode 3 LEDs:

Table 5-5

Mode 3 Example

LED LED Color Description

Collision/Mode 3 GREEN Port Enable/Partition mode is active.
Ports 1-24 OFF

Enabling and Partitioning Ports

Each repeater port is set at the factory to enable port activity. To change the
port configuration, perform the following steps:

1. From the default mode, press and release the configuration button three
times. The Mode 3 LED displays a steady GREEN light.

2. Press and hold down the button until the Mode 3 LED begins blinking
GREEN. Then release the button.

3. While the Mode 3 LED is blinking, press and hold down the button.
(The LED blinks only for a few seconds before the repeater returns to
the default mode.) A YELLOW cursor starts to scroll through the Port
1-24 LEDs. Release the button when the cursor reaches the LED that
corresponds to the port you want to change. The LED blinks
YELLOW.

GREEN

Port is enabled.
Port is partitioned.

4. Press and release the button once again to store the selection. The LED
alternately blinks YELLOW and GREEN to indicate that the selection
has been stored.

5. Repeat Steps 4 and 5 to partition additional ports.

Netelligent 3024/3124 10Base-T Repeater User Guide

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5-12 Configuring/Monitoring the Repeater

6. Once all the changes are made, press and hold down the button until
the Mode 3 LED blinks GREEN. The mode LED stops blinking after
several seconds.

7. To return to the default mode, press and release the configuration
button once.

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6-1

Chapter 6

Using the Serial COM Port

Chapter 6 describes the serial COM port on the repeater and explains how to
connect the repeater to a PC workstation via a modem or a null modem to
download software or update firmware. Also included in this chapter is
information about in-band management.

Serial COM Port

Each repeater has a male DB-9 serial port on the front panel (see Figure 1-1).
This port can be used to monitor and control all other unmanaged repeaters
(up to four 3024 10Base-T repeaters) in a stack. You can also use this port to
perform firmware upgrades.

The serial port can be accessed remotely through a modem, or it can connect
directly to a PC serial port, as shown in Figures 6-1 and 6-2.

Connecting to a Modem

Figure 6-1 shows a connection to Hayes-compatible modems. The serial cable
must have a female DB-9 connector on one end and a male connector at the
other end. The cable should not be more than 50 feet in length.

Netelligent 3024/3124 10Base-T Repeater User Guide

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6-2 Using the Serial COM Port

Modem

Modem

Female DB-9

Serial

Port

MEDIA EXPANSION

PORT

Collision 1

Mode 1

2

4 15 19 23

3

1 12

Collision 2

Mode 2

6

5

7

8

11

10

SEGMENT 2 SEGMENT 3SEGMENT 1

Collision 3

13

Mode 3

17

16

14

18

Mode 1 - BACKPLANE

PORT/SEGMENT
CONFIGURATION

Mode 2 - LINK DISABLE
Mode 3 - PARTITION

21

20

229

24

UPLINK
PORT24

Figure 6-1. Remote Link Connections via Modems

Figure 6-2 shows a connection to a PC using a null modem, which is required
to cross-connect the RS-232 signals between the repeater and the PC.

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6-3

Null Modem

(female-to-female)

Male

DB-25

Female DB-9

Collision 1

Serial

Port

Mode 1

2

3

MEDIA EXPANSION

PORT

1 12

Figure 6-2. Null-Modem-to-PC Connection

Local Console Interface

When the repeater is powered on, the PC can access the following information
from the 3124 10Base-T managing repeater:

■ MAC address

■ Board status

■ Firmware version

To access this information, connect a PC workstation as described in the
following procedure.

1. Connect a PC to the 3124 10Base-T managing repeater using one of
the methods shown in Figure 6-1 or 6-2.

Collision 2

Mode 2

6

4 15 19 23

5

7

11

10

8

SEGMENT 2 SEGMENT 3SEGMENT 1

Collision 3

13

Mode 3

17

16

14

18

Mode 1 - BACKPLANE
Mode 2 - LINK DISABLE
Mode 3 - PARTITION

21

20

229

PORT/SEGMENT
CONFIGURATION

24

UPLINK
PORT24

2. Access a communications software program (such as PROCOMM,
etc.) on the PC and configure it to the following settings:

❏ 9600 baud
❏ No parity
❏ 8 data bits
❏ 1 stop bit

Netelligent 3024/3124 10Base-T Repeater User Guide

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6-4 Using the Serial COM Port

3. Power OFF the 3124 10Base-T managing repeater and then power it
back ON. This allows the repeater to perform a status check. The PC
monitor now displays the MAC address, board status, and firmware
version.

You can also access this information via Compaq's HubView program. See the
HubView documentation for more details.

Updating Firmware

You can use the serial port to update the repeater's firmware.

NOTE: Stack management will be temporarily disabled while the firmware upgrade
takes place. The 3124 10Base-T managing repeater automatically updates the
firmware for all 3024 10Base-T unmanaged repeaters in a stack. Always refer to
the firmware upgrade instructions that ship with the upgrade kit before
downloading new information.

To perform upgrades, follow these steps:

1. Connect the repeater to a PC workstation with a floppy drive as
described in the previous section.

2. Refer to the firmware upgrade instructions that come with the upgrade
kit to determine which files to download. Load the new files as
described in the instructions.

3. To validate that the new firmware version has loaded, power OFF the
3124 10Base-T managing repeater and then power it back ON. The PC
monitor now displays the firmware version. Be sure the displayed
firmware version corresponds to the new firmware version number of
the upgrade kit.

4. If you need to replace firmware PROMs, refer to the instructions that
come with the firmware update kit.

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6-5

In-Band Management

The 3124 10Base-T managing repeater has an onboard SNMP agent.
However, the repeater can also interface with Compaq's Redirector, an HMI ­compliant agent. You can use management software, such as Compaq's
HubView or Novell's NMS, to manage the repeater.

You must connect an in-band management station to one of the first eight
ports of the 3124 10Base-T managing repeater or to one of the ports that is on
the same backplane segment as the first eight-port group of the 3124 10Base­T managing repeater .

Refer to the appropriate management software documentation for more
information.

NOTE: The 3124 10Base-T managing repeater can simultaneously manage more
than one backplane segment. Therefore, only one managing repeater is needed per
stack. If there is a BOOTP server on the network set up for the 3124 10Base-T
managing repeater, the information supplied by the server supersedes the
information stored in non-volatile memory. The 3124 10Base-T managing repeater
can manage only 3024 10Base-T repeaters.

Netelligent 3024/3124 10Base-T Repeater User Guide

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A-1

Appendix A

Installing a Management
Daughterboard

The instructions in this appendix explain how to install the repeater’s
Management Daughterboard to upgrade an unmanaged repeater to a managing
repeater.

NOTE: Only trained personnel should perform the management daughterboard
installation. Compaq recommends that any hardware upgrades be performed by
qualified Compaq personnel at our factory. If you perform management
daughterboard upgrades, be sure you are properly grounded to avoid static
discharges. Failure to use proper grounding procedures voids the repeater's
warranty.

Requirements for the Management
Daughterboard

To order a management daughterboard upgrade kit, contact your authorized
Compaq reseller. When you receive your kit, be sure the following items are
included:

■ One management daughterboard

■ Two hex standoff screws

■ Two 1/4-inch Phillips 4-40 screws

■ Two hex jack screws with washers

The following equipment is needed for installation:

■ Phillips screwdriver

■ Hex jack screwdriver

Netelligent 3024/3124 10Base-T Repeater User Guide

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A

-2 Installing the Management Daughterboard

A Note About Repeater MAC
Addresses

The MAC address is a unique identifier assigned by the manufacturer to
distinguish individual nodes. If any management software is used to manage
the repeaters, remember this number when configuring IP addresses.

The MAC address is printed on two different labels on the management
daughterboard: (1) on the MAC address chip and (2) on the back of the
management daughterboard. Remove the label from the back of the board and
place it on the back panel of the repeater that will contain the management
daughterboard. This ensures easy access to the MAC address when the
network is configured.

For extra security, write down this address and store it in a safe location.
The address is a 12 hexadecimal (six byte) number (for example,

“000079500000”) that consists of the following elements:

■ The first six characters are unique to the manufacturer(this number is

assigned by the IEEE). Compaq's identifier for the repeaters is 000079.

■ The second six characters are the unique node identifier assigned by

Compaq. These six characters always begin with a 5 (for example,

500000).

NOTE: The MAC address identifier on the back of the repeater does not contain the
0000 prefix (the first four characters of the MAC address.). When configuring IP
addresses, you must add the four zeros whenever you specify these addresses. For
example, if the label reads 79500000, the complete MAC address is

000079500000.

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A-3

Mounting the Management
Daughterboard

The procedure below describes how to mount the management daughterboard.

1. Disconnect the power cable from the back of the repeater that will
receive the management daughterboard upgrade. To power off the
repeater, disconnect the power cord (shown in Figure A-1) from the
wall outlet first. Do not disconnect the female connector from the
repeater to power down the repeater.

NOTE: For pluggable equipment, the power outlet must be installed near the
equipment and be easily accessible.

Power Cord Connector

EXPANSION PORTS

IN OUT

Media Expansion

Cable Ports

Figure A-1. Rear View of the Repeater

2. If present, disconnect the media expansion cable(s) from the expansion ports
(shown in Figure A-1).

Netelligent 3024/3124 10Base-T Repeater User Guide

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A

-4 Installing the Management Daughterboard

3. Remove the six chassis screws (shown in Figure A-2) with a Phillips

screwdriver.

Chassis Screws

(Phillips Head)

EXPANSION PORTS

IN OUT

Expansion Port Screws

(Phillips Head)

Figure A-2. Removing the Repeater Cover

4. Remove the four expansion port screws (two per port) with a Phillips
screwdriver. These screws are shown in Figure A-2. When all the screws are
out, remove the chassis cover by sliding it toward the back of the repeater.

5. Remove the two serial port screws from the repeater's faceplate(shown in

Figure A-3). Also remove the serial port shield.

Serial Port

Shield Screws

(Phillips Head)

Serial

Port

MEDIA EXPANSION

PORT

Collision 1

Mode 1

5

3

2

1 12

4 15 19 23

Collision 2

Mode 2

6

7

8

10

13

11

SEGMENT 2 SEGMENT 3SEGMENT 1

Collision 3

Mode 3

20

16

14

17

18

21

229

Chassis Screws

(Phillips Head)

24

UPLINK
PORT24

Figure A-3. Serial Port Screws

6. Insert and tighten the two hex standoff screws into the repeater’s
motherboard as shown in Figure A-4.

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A-5

72-pin Male

Connector

Hex Screw

Standoff Holes

Figure A-4. Repeater Motherboard

7. Locate the male 72-pin connector on the motherboard as shown in
Figure A-4. Insert the female 72-pin connector on the management
daughterboard into the male connector on the repeater. Be sure the
management daughterboard's mounting holes line up with the two hex
standoff screws.

8. Insert the two 4-40 Phillips screws through the management

daughterboard and into the hex standoffs. Tighten them with a Phillips
screwdriver.

CAUTION: Be sure the management daughterboard is aligned properly
and that all screws are tightened firmly into the standoffs. Otherwise,
severe damage could occur to the repeater when it is powered on.

Netelligent 3024/3124 10Base-T Repeater User Guide

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A

-6 Installing the Management Daughterboard

9. Insert the DB-9 connector (attached to the management daughterboard
via a ribbon cable) through the back side of the faceplate until it
protrudes through the front.

10. From the front side of the faceplate, insert the to hex jack screws

through the serial port holes. Place the washers over the screws from
the back side of the faceplate and tighten them with a hex jack
screwdriver.

11. Re-attach the repeater's chassis cover with the six chassis screws

removed in Step 3.

12. Screw in the four expansion port screws removed in Step 4.

13. Reconnect the media expansion cable(s) if applicable.

14. Plug the power cord into the power connector on the back of the

repeater. The lip on the power connector faces the top of the repeater.

15. Insert the three-pronged plug on the power module cable into an easily

accessible, grounded power outlet on the wall, a powerstrip, or a
grounded extension cord.

NOTE: For pluggable equipment, the power outlet must be installed near the
equipment and must be easily accessible.

The management daughterboard upgrade is now complete.

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G-1

Glossary

10Base-2

An IEEE 802.3 Ethernet standard for thin coaxial cable (ThinNet).
Stations are daisy-chained with a maximum segment length of 200
meters. The repeater uses 10Base-2 in its repeater expansion port
(REP) to provide a common, bussed Ethernet segment. The REP
10Base-2 is implemented using twisted pair (not coax), limiting the
maximum length to 76.2 meters (250 feet).

10Base-T

An IEEE standard (802.3) for unshielded twisted-pair (UTP) wiring.
Stations are connected using a star topology. The maximum segment
length is 100 meters (328 feet).

100Base-TX

An IEEE standard (802.3u) for high-speed Ethernet.

802.2

An IEEE standard that governs Logical Link Control (LLC). The LLC
layer can provide either connections-oriented services, connectionless
services, or a combination of both.

802.3

An IEEE standard that governs Carrier Sense Multiple
Access/Collision Detect (CSMA/CD) networks. 802.3, referred to as
Ethernet, operates on different cable types (for example, UTP, coax,
fiber).

Alternate Media Module

An optional module that plugs into a repeater to provide an AUI, BNC,
or fiber Media Expansion Port (MEP). The MEP is the 17th port.

Netelligent 3024/3124 10Base-T Repeater User Guide

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G-2

ARP

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

autopartition

The automatic disabling of a port by hardware after a specific number
of consecutive collisions occur.

backplane

The data bus connections used to interconnect different communication
modules inside a networking concentrator.

backup port

Provides a redundant connection for a primary port in mission critical
applications. The firmware activates the backup port when the primary
port loses link test or becomes autopartitioned by the hardware. The
repeater allows any port in the repeater to back up another port within
the repeater.

BNC

A type of connector used for thin coaxial cable. BNC connectors are
used to connect stations in a ThinNet (10Base-2) network.

BOOTP

Bootstrap Protocol. You can use a BOOTP server to set the initial
repeater configuration parameters (for example, IP address, IP net
mask, IP default gateway) and to assist in downloading the latest
version of the Flash. A repeater BOOTP request contains the repeater's
MAC address.

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G-3

boot sectors

The repeater uses four 16KB sectors of Flash as the firmware boot
sectors. The boot sectors, which are hardware write-protected, cannot
be modified by downloading the Flash.

carrier sense

The monitoring of a local area network by a node to determine if
another node is transmitting.

coax, coaxial cable

A type of shielded cable used in communication networks. Different
types of coaxial cable include Ethernet and RG-6.

collision

Simultaneous transmission on the communication media.

concentrator

A device that houses other repeaters and modules, to provide
connectivity between data terminals in a network.

configuration

The layout of nodes and components in the network.

cross connect

A panel on which the leads of station cable are mounted so that a
technician or the system administrator can make electrical connections
between the communications devices wired to the cables.

dielectric

A substance that does not conduct electrical current.

Netelligent 3024/3124 10Base-T Repeater User Guide

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G-4

flash

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

Ethernet II

Ethernet II or DIX 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.

Fiber Distributed Data Interface (FDDI)

A high-speed networking standard. The underlying medium is fiber
optics, and the topology is a dual-attached, counter-rotating token ring.

Repeater Expansion Port (REP)

Used to interconnect up to 10 repeaters to form a single logical stack.

hot swappable

A module, switch, or repeater's ability to be added or removed from a
stack without removing power from the switch or repeater.

repeater

Localizes the connections for multiple network nodes. A repeater is
sometimes called a concentrator.

repeater autodiscovery

The following terms are associated with the Novell repeater
autodiscovery:

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G-5

autodiscovery

The ability of a network manager to discover the node address and
functionality of network devices. The 8-port and 16-port repeaters
support IPX autodiscovery.

Hub Management Interface (HMI) Driver

A 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

Required to support the Novell NetExplorer server. The NetExplorer
server is used to update the NMS database with the current network
configuration.

Routing Information Protocol (RIP)

The routing protocol used by TCP/IP and 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 MAC
address, thus allowing NMS to initiate SNMP over IPX
communication.

Services Advertising Protocol (SAP)

The Novell (SAP) allows the firmware to advertise its services. The
SAP requests, which are issued over IPX, are broadcast every 60
seconds. The SAP packet contains the SAP IDs of the available
services. The 8-port and 16-port repeater SAP packets will use a hex
SAP ID of 0239 (HMI services) and a hex SAP ID of A905 (10Base-T
Repeater services; used to display the correct icon on the NMS
segment map).

Netelligent 3024/3124 10Base-T Repeater User Guide

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G-6

SAP ID

The SAP ID is used to identify the type of services available by a
server. The 8-port and 16-port repeaters use a hex SAP ID of A905 to
advertise themselves as a repeater service.

Internet Control Message Protocol
(ICMP)

Provides error handling and control messages for TCP/IP.

Interrepeater Communication

The 10Base-T interrepeater communication is implemented using the
REP, bidirectional, RS-485, 38.4 K Baud, serial connection. This link
uses a bucket brigade with token passing protocol to pass information
from repeater to repeater within a stack.

IP Address

The Internet Protocol address assigned to a repeater, module, or node.
Internet Protocol provides connectionless, best effort datagram delivery
service.

jabbering

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

Light Emitting Device (LED)

Devices considered to be eye safe due to relatively low optical power
which, by design, emit incoherent light at a power level well within
guidelines for eye safety.

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G-7

link test

A test that is performed by the hardware to ensure the integrity of the
cable. The link test can be disabled to allow old style NICs incapable
of performing a link test to connect to the repeater.

Local Area Network

A data communications network consisting of host computers or other
equipment interconnected to terminal devices, such as personal
computers, often via twisted-pair wire or coaxial cable. Typically, the
network is limited to a single premise.

MAC Address

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

manageable

A repeater is manageable is it contains an SNMP agent and there is a
data communications path to that agent.

Media Expansion Port (MEP)

Created by plugging an optional Alternate Media Module into the 16­port repeater. The MEP (the 17th port) provides an AUI, BNC, or fiber
connection.

Management Information Base (MIB)

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

Netelligent 3024/3124 10Base-T Repeater User Guide

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G-8

modular cord

A cord containing four twisted pairs of wires, with a modular plug on
one or both ends.

module

The component that provides connectivity ports for the LAN. Modules
are installed in larger systems, called concentrators.

Network Interface Connector (NIC)

A card which plugs into a device and allows it to be connected to a
network.

NMS, Novell

Novell's NetWare Management System (NMS) 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
8-port and 16-port repeaters will advertise that they have an HMI
driver and repeater services

node

A device that is attached to a network and communicates by means of
the network. Any network station

partition

The electrical disconnecting of a node from a LAN at its point of
connection to a repeater. The node remains physically attached.

Protocol Data Unit (PDU)

A packet that contains control information and optional data.

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G-9

plenum cord

Communications cord with fire-retardant insulation, generally used in
suspended ceilings and other places where air circulates back to the
building's air-conditioning system.

port

An external connector used to connect PCs and other node devices to
the network.

POST

The Power-On Self-Test (POST) is a sequence of events a repeater or
module performs when it powers up to check the functionality of the
unit.

Reverse Address Resolution Protocol
(RARP)

Server used to set a repeater's IP address.

RJ-45

An 8-wire modular connector used for 10Base-T Ethernet and some
telephones.

RS-232

The EIA (Electronics Industry 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.

Netelligent 3024/3124 10Base-T Repeater User Guide

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G-10

RS-485

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

RJ-45

A connector used for 10Base-T wiring (unshielded twisted-pair
Ethernet).

router

A device used to connect two or more networks at the Network layer of
the ISO-OSI reference model. The router must understand the
communication protocols being used because it uses information
provided by the protocols in each packet to determine how to route the
packets.

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.

stack

A stack is a group of interconnected repeaters.

10Base-T

IEEE 802.3 standard for twisted-pair Ethernet. 10 Mb/s over baseband
using unshielded, twisted-pair cable.

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G-11

Telco

A 25-pair polarized connector that is used to consolidate multiple voice
or data lines.

twisted pair wire

Two insulated copper wires twisted together. The twists vary in length
to reduce the potential for signal interference between pairs. In cables
greater than 25 pairs, the twisted pairs are grouped and bound together
in a common cable sheath. Twisted pair cable is the most common of
transmission media.

Trivial File Transfer Protocol (TFTP)

Used to download a new Flash image.

trap

A trap is an unsolicited event sent from an agent to a network
management station. Examples of traps include cold start, port
autopartition, and backup port enabled.

User Datagram Protocol (UDP)

Provides reliable connectionless delivery service using IP. It adds the
ability to distinguish among multiple destinations within a given host.

Unshielded Twisted Pair (UTP)

Cable is usually connected using RJ-45 connectors.

wiring environment

Any building communications wiring system. See also 66-type wiring
environment.

Netelligent 3024/3124 10Base-T Repeater User Guide

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G-12

wiring closet

A room, closet or cabinet where station cable is terminated on
crossconnect blocks and where the building communications system
can be administered.

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I-1

Index

10Base-T pinout 3-7

A

Altitude 3-1
ANSI Z136.1 -981 2-5
AT&T high-performance cable 2-2
AUI connector 2-4
AUI Media Option 2-4

B

Backplane

definition 4-2

segment assignments 4-3
Backplane Segment mode 5-5
Backplane segments

assignment 5-7

local 5-6

standard 5-6
Baud 6-2
BNC board 2-3
BNC Jumper AW1 2-3
BNC media connector 2-3
BNC Media Option 2-1, 2-3
BNC port 2-3
Board status 6-2

D

D8W 3-6
Data bits 6-3
Data bus connection

Backplane See
DB-9 6-1
Default configuration mode 5-4
Diagnostic LEDs 1-2
Domain 4-1

E

Electrical requiremeents 3-1
Extended Distance 2-1, 2-2
Extended Distance Jumper AW1 2-2

F

Faceplate

connector 2-2, 2-3, 2-4
Faceplate screws 2-2, 2-4
Fiber Media Option 2-4
Firmware 6-3
Firmware version 6-2
Flash PROM 1-2
FOIRL backbone 2-4

H

HubView 5-2
Humidity 3-1

C

Change port configuration 5-11
Collision/mode indicators 1-3
Connecting power 3-2
Connector board 2-3
Connector options 2-1

I

In-band management 6-4
Insert AUI media connector board

2-4

Insert BNC media connector board

2-4

Netelligent 3024/3124 10Base-T Repeater User Guide

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

-2 Index

L

LEDs 1-3, 3-4
Link integrity

enabling/disabling 5-8, 5-9

Location 3-1

M

MAC address 6-2
Management activities 1-2
Media Connection Options 2-1
Modem 6-1
Modes

configuration 5-2

switching 5-4
Motherboard 2-2, 2-4
Multiple backplane segments 4-1

N

Network connections 3-8
Network expansion 3-9
Null modem 6-2

O

Optional Media Connectors 2-1

R

Repeater

basic requirements 3-1
configuration operations 5-1
faceplate and backpanel 1-4
features 1-1
management features 1-2
technical specifications 1-3

S

Segmentation, definition 4-1
Self test 3-4
Serial COM port 6-1
Serial port 6-1
Spatial requirements 3-2
Stop bit 6-3
Switching between modes 5-4

T

Temperature 3-1
Thicknet backbone 2-4
Thinnet backbone 2-3
Transmitter output power 2-5
Twisted-pair wire specifications 3-5

P

Pin male connector 2-2, 2-4
Port 1 2-1
Port Activity Monitor mode 5-3
Port Enable/Partition 5-10
Port group 4-5
Power connections 3-2
Power failure 1-2

U

Updating firmware 6-3
Use AUI media connector 2-4
UTP cable 2-2
UTP connection 2-1
UTP media connector board 2-1, 2-2
UTP Media Option 2-1
UTP module board 2-3, 2-4

factory-installed 2-4

UTP wiring 2-1, 2-2