Compaq Netelligent 1108 User Manual

Netelligent 1108

100Base-TX Repeater

User Guide

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iii

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 1108 100Base-TX Repeater

User Guide

Second Edition (April 1996)

Part Number 185813-002

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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)

Netelligent 1108 100Base-T Repeater User Guide

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vii

Contents

Preface

Intended Reader........................................................................................................ix

Organization of Contents ..........................................................................................ix

Chapter 1

Introduction

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

Hub Components ....................................................................................................1-2

LED Indicators.................................................................................................1-2

RJ-45 Ports.......................................................................................................1-3

Uplink Switch..................................................................................................1-4

Chapter 2

Planning Hub Installation

Before You Begin...................................................................................................2-1

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

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

Electrical Requirements...................................................................................2-1

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

Twisted-Pair (UTP/STP) Wire Requirements...................................................2-3

System Planning Charts ..........................................................................................2-5

Hub Setup and Cabling Chart...........................................................................2-5

Rack Inventory Chart.......................................................................................2-6

Chapter 3

Installing the Hub

Mounting the Hub...................................................................................................3-1

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

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viii

Rack-Mounting the Hub...................................................................................3-1

Connecting Twisted-Pair Cable............................................................................... 3-2

Setting the Uplink Switch .......................................................................................3-3

Interconnecting Hubs..............................................................................................3-4

Connecting Power...................................................................................................3-4

Appendix A

Specifications

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

Ports and Connectors.......................................................................................A-1

LED Indicators................................................................................................A-1

Controls ..........................................................................................................A-1

Power Requirements .......................................................................................A-1

Power Consumption........................................................................................A-1

Power Cord (USA)..........................................................................................A-1

Physical Specifications ..........................................................................................A-2

Dimensions.....................................................................................................A-2

Weight............................................................................................................A-2

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

Operating Environment...................................................................................A-2

Storage Environment.......................................................................................A-2

Glossary
Index

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ix

Preface

This guide includes information about how to install and operate the 100Base­TX Fast Ethernet repeater. We recommend that you read all chapters in this
guide to become familiar with all of the repeater's features and to ensure a
successful installation.

Intended Reader

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

Organization of Contents

The contents of this guide are organized as follows:
Chapter 1  Provides an overview of the 100Base-TX repeater and describes

the repeater's features.

Chapter 2  Helps you plan the installation of the repeater.
Chapter 3  Provides instructions for installing and powering up the repeater

and for interconnecting repeaters.
Appendix A  Includes the repeater's electrical, physical, and environmental

specifications.
Glossary  Provides terms used throughout this guide, as well as general

networking terms.

Netelligent 1108 100Base-TX Repeater User Guide

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Chapter 1

Introduction

The Compaq Netelligent 1108 100Base-TX Repeater (Part No. 267022-001)
provides a high-speed solution to increasingly heavy network traffic and slow
data throughput. The repeater uses the IEEE 802.3u, 100Base-TX standard to
increase the speed of network transmissions by a factor of about 10. This
enhanced performance greatly improves your network's efficiency.

The repeater has an uplinkable port that lets you connect the repeater to
another repeater, providing a maximum of 14 ports on the same collision
domain. The repeater also has several LEDs that help you monitor the its
status at the repeater and port levels. The repeater provides active
management by autopartitioning ports and monitoring error conditions.

1-1

Features

The repeater includes these features:

■ Eight shielded RJ-45 ports to support UTP (Category 5) or STP cable

■ Front-panel uplink switch that lets you connect the repeater to another

repeater, providing a maximum of 14 ports on the same collision
domain

■ LEDs that indicate power, repeater activity, and collisions for the

repeater, and link, activity, and partition status for each port.

■ Transparent active management that autopartitions jabbering ports

■ Full compatibility with the IEEE 802.3u 100Base-TX repeater

specification

■ Chassis that can stand alone or be mounted in a standard 19-inch rack

■ Surface-mount technology

■ Built-in power supply that operates on a 100 to 240 VAC, 50 to 60 Hz

power source

Netelligent 1108 100Base-TX Repeater User Guide

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1-2 Introduction

Kit Contents

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

■ 1108 100Base-TX Repeater (Part No. 267022-001)

■ Shielded AC power cord

■ Compaq Netelligent 1108 100Base-TX Repeater User Guide

Hub Components

This section provides an overview of the repeater's components including the
LED indicators, RJ-45 ports, and uplink switch. Figure 1-1 shows the repeater
front panel and back panel.

Power/Segmentation/

Activity LED Indicators

RJ-45 Ports and LEDs

12 3 456 7 8

PWR

ACT
COL

XXXXXXX

Figure 1-1. Repeater Front Panel

Power Cord Connector

Figure 1-2. Repeater Back Panel

UPLINK

MDIMDI-X

UPLINK Switch
(for converting

uplinkable port)

Port 8 to

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LED Indicators

The repeater features several LED indicators that help you monitor the
repeater. The LEDs on the left side of the front panel provide the power ,
activity, and collision status of the repeater. The LEDs above the RJ-45 ports
indicate the link, activity, and partition status for each of the ports. Figure 1-2
shows the LED arrangement for the repeater.

RJ45 Port

LED Indicators

12 34 5 6 7 8

PWR

ACT
COL

XXXXXXX

Power/Activity/Collision

LED Indicators

UPLINK

MDIMDI-X

1-3

Figure 1-3. LED Indicators

The following information lists the possible conditions, colors, and statuses of
each LED and describes the meaning of each condition.

■ PWR LED  Steady green indicates that power is supplied to the

repeater. OFF indicates that no power is supplied to the repeater.

■ ACT LED  Flashing green indicates that there is activity at one or

more of the repeater's ports.

■ COL LED  Flashing yellow indicates that the repeater detects a

collision. OFF indicates that no collisions are occurring.

■ RJ-45 LEDs  Steady green indicates that a link condition is present.

Steady yellow indicates that the port is disabled (autopartitioned).
Flashing green  indicates that there is activity at the port. Alternately
flashing yellow and green indicates that a link condition is present but
an error condition, such as a jabber, is being detected. OFF indicates
that no link condition is present at the port or there is no connection at
the port.

NOTE: LEDs listed as yellow might appear orange on the repeater's front panel.

Netelligent 1108 100Base-TX Repeater User Guide

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1-4 Introduction

RJ-45 Ports

The repeater has eight RJ-45 ports that let you connect UTP or STP cabling to
workstations and servers in an Ethernet network.

Uplink Switch

The uplink switch enables the 8th port on the repeater to function as either a
standard IN RJ-45 port or an uplinkable OUT” RJ-45 port.

IN ports use an internal crossover of the receive and transmit lines, enabling
the port to connect to a network interface card using standard 8-wire UTP
cable. OUT” ports use a straight-through (uncrossed) connection, enabling the
port to connect to any IN port of a second repeater. This allows two repeaters
to be on the same segment.

Standard

"IN" Repeater Port

(Default)

X X

Figure 1-4. Uplink Switch

UPLINK

MDIMDI-X

76

8

UPLINK

MDIMDI-X

Uplinkable

"OUT" Port

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2-1

Chapter 2

Planning Hub Installation

This chapter contains information to help you prepare for installing the
100BASE-TX repeater.

Installation Requirements

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

Environmental Requirements

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

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

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

■ Altitude: 0 to 10,000 feet

Netelligent 1108 100Base-TX Repeater User Guide

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2

-2 Planning Hub Installation

Electrical Requirements

The electrical requirements for a repeater are as follows:

■ Voltage: 100 to 240 VAC

■ Frequency: 50 to 60 Hz

■ Power: 0.25 to 0.5 Amps maximum

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

NOTE: If the supplied shielded power cord is lost or damaged, replace it with an
identical shielded power cord set to ensure emissions compliance.

Spatial Requirements

The repeater's dimensions are 1.75 x 17.00 x 8.5 inches, 4.44 x 43.18 x 21.59
centimeters (HxWxD).

You can interconnect two repeaters. If there is not enough space to mount the
repeaters in a single rack or stack them on a single shelf, or if you want to
place the repeaters in different locations, you can place them on separate
shelves or in separate racks. If this is necessary, you will need longer repeater
expansion port cables to connect the repeaters. See the “Twisted-Pair
(UTP/STP) Wire Requirements” section in this chapter for more information.

Be sure to allow at least 2 inches (5.1 centimeters) on each side of the repeater
for proper air circulation and cable connections.

Twisted-Pair (UTP/STP) Wire Requirements

The twisted-pair wiring you use to connect the repeater's RJ-45 ports must
meet the following minimum specifications and requirements to ensure long­term LAN reliability.

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2-3

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

Category 5.

■ 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 wire gauge should be between 18 and 26 AWG. (Most telephone

installations use 24-gauge wiring.)

■ UTP wire should meet the following requirements:
❏ Solid copper
❏ Nominal capacitance: less than 16 pF/ft
❏ Nominal impedance: 100 Ohms
❏ Nominal attenuation: less than 11.5 db

CAUTION: Never use gray satin station cable for connecting a repeater.
This flat cable, typically used for connecting telephones to wall jacks, is
incompatible with 100BASE-TX systems.

Straight-through twisted-pair cable is typically used to connect a repeater to a
server or workstation. In a straight-through connection, Pin 1 at the repeater
connects to Pin 1 at the server, Pin 2 at the repeater connects to Pin 2 at the
server, and so on. Figure 2-1 shows the locations of pins on a standard RJ-45
plug on a twisted-pair cable.

Netelligent 1108 100Base-TX Repeater User Guide

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2

Signal

Description

Signal

Description

-4 Planning Hub Installation

Twisted-Pair Cable

1

2

3

6

RJ-45 Plug

Pins

Figure 2-1. RJ-45 Plug Pin Locations

Table 2-1 shows the wiring in a straight-through and crossover twisted-pair
cable. (Pins 4, 5, 7, and 8 are not used.)

Table 2-1

Straight-Through Twisted-Pair Wiring

Twisted Pair Number Pin

Number

11

2

23

6

TD+

TD-

RD+

RD-

To Pin Number Signal

Description

➔
➔
➔
➔

1
2
3
6

TD+

TD-

RD+

RD-

Twisted Pair Number Pin

Crossover Twisted-Pair Wiring

Number

11

2

23

6

TD+

TD-

RD+

RD-

To Pin Number Signal

Description

➔
➔
➔
➔

3
6
1
2

RD+

RD-

TD+

TD-

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2-5

System Planning Charts

The charts in Figures 2-2 and 2-3 provide a convenient way of planning the
connections for your repeater.

100Base-TX Repeater Setup and Cabling Chart

Date

Unit Number
Building
Location

Rack Mount
Table Mount

Uplink Switch Setting

MDI-X (default)
MDI (uplinkable)

Figure 2-2. Hub Setup and Cabling Chart

Port Connects To

8

7
6

4 5

1 2 3

Netelligent 1108 100Base-TX Repeater User Guide

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2

-6 Planning Hub Installation

Rack Inventory Chart

Use this chart to record the components installed in a particular rack.

Wiring Closet Number
Rack Number
Installer

Date

Figure 2-3. Rack Inventory Chart

Example

100Base-TX Repeater
100Base-TX Repeater

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3-1

Chapter 3

Installing the Repeater

This chapter explains how to mount the 100Base-TX repeater, attach cables,
and interconnect the repeater to a second 100Base-TX repeater.

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 its bottom side faces up.

2. Remove the four rubber feet from their packaging.

3. Peel the protective paper backing off the rubber feet.

4. Then position the feet near the corners of the repeater and press the feet
into place.

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

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

Rack-Mounting the Repeater

To mount the repeater in a rack, you must use the RKIT02 installation kit (not
supplied). This kit includes two side mounting brackets and eight screws to
secure the brackets. To attach the brackets, position them as shown in Figure
3-1. Then secure the brackets with the screws supplied with the mounting kit.

Netelligent 1108 100Base-TX Repeater User Guide

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3-2 Installing the Hub

Figure 3-1. Attaching the Mounting Brackets

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 mounting
screws (not supplied).

12 34 5 6 78

PWR

ACT
COL

XXXXXXX

Figure 3-2. Positioning the Repeater in a Rack

Connecting Twisted-Pair Cable

Each RJ-45 port on the repeater can accept a standard 4-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).

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-TX-equipped workstation.

UPLINK

MDIMDI-X

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3-3

100Base-TX Repeater

1 2 3 4 5 6 7 8

PWR

ACT
COL

XXXXXXX

UPLINK

MDIMDI-X

100Base-TX-Equipped

Workstation

Figure 3-3. Connecting Twisted-Pair Cable

Netelligent 1108 100Base-TX Repeater User Guide

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3-4 Installing the Hub

Setting the Uplink Switch

The uplink switch lets you convert the repeater's 8th RJ-45 port to an
uplinkable port so that you can interconnect two repeaters without the need for
special crossover cables. The default setting for the switch is MDI-X (Media
Dependent Interface-Reversed that is, standard repeater port). To convert Port
8 to an uplinkable port, use a small, slotted screwdriver, or a similar tool, to
set the switch to the MDI position.

Standard

"IN" Repeater Port

(Default)

76

X X

Figure 3-4. Uplink Switch (Default Setting)

Interconnecting Repeaters

You can interconnect two repeaters, providing up to 14 ports in the same
collision domain (Segment).

To interconnect two repeaters, set the uplink switch as described in “Setting
the Uplink Switch” in the previous section and connect the repeaters as shown
in Figure 3-5.

UPLINK

8

UPLINK

MDIMDI-X

MDIMDI-X

Uplinkable

"OUT" Port

NOTE: The maximum recommended cable distance between two repeaters is 25
meters (82 feet). Exceeding this limit provides unreliable results.

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3-5

12 34 5 6 7 8

PWR

ACT
COL

XXXXXXX

12 34 5 6 7 8

PWR

ACT
COL

XXXXXXX

UPLINK

MDIMDI-X

UPLINK

MDIMDI-X

UPLINK

UPLINK Switch

Set to MDI Position

MDIMDI-X

Figure 3-5. Interconnecting 100Base-TX Repeaters (Set to MDI Position)

Connecting Power

Follow these steps to connect the repeater to power:

WARNING: The repeater has no power switch. Plugging in the power
cord powers up the repeater.

1. Plug the power cord into the power connector on the back of the
repeater.

2. Insert the three-pronged plug on the power cord into a non-switched,
grounded power outlet on a wall, a power strip, or a grounded
extension cord.

NOTE: The power outlet should be near the repeater and easily accessible.

Netelligent 1108 100Base-TX Repeater User Guide

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3-6 Installing the Hub

Power Cord Connector

Figure 3-6. Connecting the Power Cord

When you plug in the power cable, the PWR LED lights steady green.

Disconnecting Power

To power down the repeater, disconnect the power cord from the outlet. Do
not power down the repeater by disconnecting the power cord from the
repeater.

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A-1

Appendix A

Specifications

Electrical Specifications

Ports and Connectors

■ Eight RJ-45 ports

LED Indicators

■ Power (PWR), Activity (ACT), and Collision (COL) status

■ Eight RJ-45 port to indicate link, activity, and partition status

Controls

■ Two-position (MDI/MDI-X) uplink switch

Power Requirements

■ Voltage: 100 to 240 VAC

■ Frequency: 60 to 50 Hz

■ Power: 0.25 to 0.5 Amps maximum

Power Consumption

■ Maximum: 16.2 W

Power Cord (USA)

■ Shielded 1.8 meters (6 feet), 10 Amps

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A

-2 Specifications

Physical Specifications

Dimensions

■ 1.75 x 17 x 8.5 inches, 4.44 x 43.18 x 21.59 cm (HxWxD)

Weight

■ 4 pounds (1.81 kg)

Environmental Specifications

Operating Environment

■ 32° to 120° F (0° to 49° C)

■ 5% to 95% humidity (non-condensing)

Storage Environment

■ 32° to 151° F (0° to 66° C)

■ 5% to 95% humidity (non-condensing)

■ 0 to 30,000 feet altitude (0 to 9 kilometers)

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G-1

Glossary

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.

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).

adapter

See NIC.

AUI (attachment unit interface)

See transceiver cable.

backplane

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

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G-2

bridge

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

carrier sense

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

Class 1 LED

See LED.

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.

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G-3

cross connect

A panel on which the leads of station cable are mounted so that a
technician, other wiring craftsperson, 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.

Electronic Industry Association (EIA)

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.

hot-swappable

Refers to the ability of a module, switch, or repeater to be added or
removed from a stack without removing power from the switch or
repeater.

jabbering

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

Netelligent 1108 100Base-TX Repeater User Guide

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G-4

Local Area Network (LAN)

A communication system which covers a limited geographical area, as
distinguished from a Wide Area Network which spans a wide
geographical area.

Light Emitting Diode (LED)

A device that emits light at a power level well within guidelines for
eye safety. LEDs are typically used to indicate the operating status of a
repeater or module.

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.

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 Card (NIC)

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

node

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

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G-5

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.

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.

repeater

A device that provides connectivity between data terminal equipment.
Localizes the connections for multiple network nodes. A repeater is
sometimes called a concentrator.

RS-232

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

Recommended standard 485 defines a standard way of transferring
serial information by wire using differential line drivers and receivers.

Netelligent 1108 100Base-TX Repeater User Guide

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G-6

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.

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.

Telco

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

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G-7

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.

Unshielded Twisted Pair (UTP)

Cable usually connected using RJ-45 connectors

wiring environment

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

wiring closet

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

Netelligent 1108 100Base-TX Repeater User Guide

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I-1

Index

1

100Base-TX 1-1, 1-2, 2-1, 2-3, 3-2

A

Activity LED 1-3
Air circulation 2-2
Altitude ranges 2-1

B

Back panel 1-2

C

Cable, crossover 2-4
Chart, rack inventory 2-6
Collision domain 3-4
Collision status LED 1-3
Components 1-2
Crossover 1-4

D

Dimensions 2-2

F

Features 1-1
Frequency 2-2
Front panel 1-2

H

Humidity ranges 2-1

I

IEEE 802.3u 1-1
IN ports

definition 1-4

Installation 3-1

planning 2-1

Interconnecting repeaters 3-4

L

LEDs 1-1, 1-2

ACT 1-3
COL 1-3
PWR 1-3, 3-6
RJ-45 1-3

M

MDI 3-4
MDI-X 3-4
Mounting 3-1
Mounting brackets, attaching 3-2

N

Network interface card 1-4

O

OUT 1-4

P

Planning charts 2-5
Ports

RJ-45 1-1

Power 1-3, 2-2

connecting 3-5
cord 2-2, 3-5
disconnecting 3-6
outlet 2-2, 3-5

Netelligent 1108 100Base-TX Repeater User Guide

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-2 Index

requirements 2-2

Power LED 1-3

R

Rack-mounting repeater 3-1
Requirements

electrical 2-1
environmental 2-1

spatial 2-2
RJ-45 1-1
RJ-45 ports 1-2–1-4, 1-2
RKIT02 3-1
Rubber feet, attaching 3-1

S

Segment 1-4, 3-4
STP 1-1, 1-4, 2-3, 3-2
Straight-through (uncrossed)

connection 1-4

W

Wiring

crossover 2-4
guage 2-3
straight-through 2-4

T

Temperature ranges 2-1
Twisted-pair

connecting 3-2

specifications 2-3

U

Uplink switch 1-4

setting 3-4
UTP 1-1, 1-4, 2-3, 3-2

V

Voltage 2-2