Compaq Netelligent 1017A/B Manuale utente

Compaq Registered U.S.Patent andTrademark Office.

Company and product names mentioned herein may be

trademarks and/or registered copyright and trademarks of

their respective companies.

Netelligent 1017A/B

10Base-T Hub

User Guide

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iii

Writer: Chris Seiter Project: Notice Comments:

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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.

1997 Compaq Computer Corporation.

Compaq

Registered United States Patent and Trademark Office.

Netelligent is a trademark of Compaq Computer Corporation.

Compaq Netelligent 1017A/B 10Base-T Hub User Guide

Second Edition (August 1997)

Part Number 167175-002

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Compaq Netelligent 1017A/B 10Base-T Hub User Guide

Writer: Chris Seiter Project: Compaq Netelligent 1017A/B 10Base-T Hub User Guide Comments:

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Contents

Chapter 1

Overview

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

Chapter 2

Hardware Description

Front Panel....................................................................................................................2-2

LED Indicator Panel..............................................................................................2-2

Station Ports...........................................................................................................2-6

Daisy-Chain Switch...............................................................................................2-7

Back Panel ....................................................................................................................2-7

Port Connections....................................................................................................2-8

Power Socket.........................................................................................................2-8

Power Switch.........................................................................................................2-9

Chapter 3

Installing the Hub

Site Requirements.........................................................................................................3-1

Connecting the Hub System .........................................................................................3-2

Chapter 4

Configuration

Stand-alone Configuration............................................................................................4-1

Connecting Multiple Hubs............................................................................................4-2

Using the RJ-45 Daisy-Chain Port ........................................................................4-2

Using Crossover Twisted-Pair Cable ....................................................................4-3

Backbone Connection...................................................................................................4-4

Using the BNC Port...............................................................................................4-4

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Using the AUI Port................................................................................................4-5

Guidelines for Multiple Hub Configurations................................................................4-6

Appendix A

Troubleshooting

Diagnosing Hub Indicators..........................................................................................A-1

System Diagnostics......................................................................................................A-2

Installation............................................................................................................A-2

Configuration........................................................................................................A-2

Hub Integrity ........................................................................................................A-3

Appendix B

Port and Cable Assignments

Appendix C

Specifications

Appendix D

Regulatory Standards Compliance

Index

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vii

Compaq Netelligent 1017A/B 10Base-T Hub User Guide

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Preface This user guide is designed for the experienced network installer. It covers the

following information to help in the installation and operation of the Netelligent

1017A/B 10Base-T Hub:

QHardware description and summary of features

QHardware installation and configuration

QTroubleshooting tips

Package Checklist

Carefully unpack the contents of the package and verify them against the

checklist given below.

Q1017A/B 10Base-T Hub

QBNC T-type connector

QAC power cord

QCompaq Netelligent User Guide CD

QCompaq Netelligent 10Base-T Hub Quick Install Guide

QWarranty registration card

If there are any incorrect, missing, or damaged parts, contact your Compaq

Authorized Reseller. If possible, retain the carton, including the original

packing materials, in case you need to repack the contents and return the hub for

repair.

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1-1

Compaq Netelligent 1017A/B 10Base-T Hub User Guide

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Chapter 1

Overview

The Netelligent 1017A/B 10Base-T Hub is a 16-port Ethernet hub which

features an on-board microprocessor designed to monitor network utilization,

collisions, link and port partition status. The hub’s comprehensive LED

indicator panel simplifies installation and network troubleshooting by showing

network utilization and collision levels at the hub ports.

Features

The hub also provides the following features:

Automatic Partitioning and Reconnection – automatically isolates a port in

the event of excessive collisions and reconnects the port when normal operation

resumes

Jabber Lockup Protection –automatically stops transmission of abnormal

Ethernet frames that could cause data loss for the network

Automatic Polarity Detection – recognizes and adjusts 10Base-T ports for

attached cable assemblies which may be wired with incorrect polarity on the

receive pair

16 independent RJ-45 ports – enables network connections using 10Base-T

twisted-pair cable

Cascading – lets you connect the 1017A/B hub to another 1017A/B or

compatible hub using a switch to convert Port 16 to an uplink port

BNC and AUI Port – lets you connect the hub to 10Base2 (BNC) cabling and

10Base5 or fiber optic cabling via a suitable transceiver connected to the AUI

IEEE 802.3 Compliant – conforms to IEEE 802.3 repeater specification, as

well as the 10Base-T, 10Base2 and 10Base5 standards

Flexible Installation – lets you mount the hub on desktop or in a standard 19-

inch rack

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2-1

Compaq Netelligent 1017A/B 10Base-T Hub User Guide

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Chapter 2

Hardware Description

The 1017A/B 10Base-T Hubis a highly reliable network concentrator that

complies with IEEE 802.3 specifications. By passing data signals received on

any port to all other ports, without modification, this hub meets the

requirements for both Ethernet and IEEE 802.3 networks.

This chapter describes the main hub components. For easier management and

control of the hub, familiarize yourself with the front panel indicators. Figure

2-1 shows the front panel of the hub where the comprehensive LED indicators,

16 RJ-45 station ports and the uplink switch are located. Figure 2-2 shows the

trunk ports, power connector and power switch on the hub's back panel.

Figure 2-1 . Front Panel

Figure 2-2 . Back Panel

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2-2

Hardware Description

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Front Panel

This section describes the 1017A/B hub’s front panel.

LED Indicator Panel

The LED indicator panel includes comprehensive indicators for monitoring

device and network status. The LEDs on the front panel let you easily monitor

the status of each port, plus the overall condition of the hub. The following

sections describe the function of each indicator.

Figure 2-3 . LED Panel

Power

Color: Green

Label: Power

Function: Power indicator

LED Activity Condition Indication

STEADY LIGHT ON Unit is receiving power.

NO LIGHT OFF Power is disconnected; no power received.

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2-3

Compaq Netelligent 1017A/B 10Base-T Hub User Guide

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CPU

Color: Green

Label: CPU

Function: Power indicator

LED Activity Condition Indication

BLINKING LIGHT ON CPU is running.

NO LIGHT OFF CPU is not running.

Utilization

Label (%) Color Function

1% 5% 15% Green

30% 65+% Amber (yellow) Indicates percentage utilization of LAN

bandwidth.

The Utilization LEDs indicate the percentage of network bandwidth used by

valid data. The hub updates this display every 0.5 seconds.

There are five LEDs that represent the percentage of network utilization. The

corresponding LEDs light to show that the percentage utilization of LAN

bandwidth has reached this level. When active, these LEDs look like a stereo's

equalizer display.

For example, if network utilization reaches 1%, the LED labeled 1% lights.

However, if network utilization rises above 1% (for example, 30%), the LED

labeled 30 and all the other LEDs before it (that is, 1, 5, and 15) light in rapid

succession.

These LEDs monitor the share of valid network frames transmitted by this hub

within a 10Mb/s bandwidth. They provide a quick way to monitor the current

traffic load relative to the network's capacity.

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2-4 Hardware Description

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Collision

Label (%) Color Function

1% 3% 5% Green

10% 15+% Amber (yellow)

Indicates the percentage of packet collisions

occurring out of the total packets received by

the hub.

Collisions occur when two or more devices connected to a hub attempt to

transmit data simultaneously on the network. When a collision occurs, devices

pause and then re-transmit after a pseudo-random wait period. Because wait

periods differ among devices, successive collisions become increasingly

improbable.

The Collision LEDs assist the network manager in monitoring the percentage of

packet collisions occurring relative to the total packets received by the hub.

Similar to Utilization LEDs, the Collision LEDs have five numbers that

represent collision percentage. When collisions reach a level marked on the

LED display, the corresponding LED lights.

For example, if packet collisions reach 1%, the LED labeled 1% lights.

However, if collisions go beyond 1% (for example, 15%), the LED labeled 15+

and all the other LEDs before it (that is, 1, 3, 5, and 10) also light in rapid

succession.

NOTE: After 32 consecutive collisions occur on the cable segment connected to a

port, that port is automatically partitioned by the hub. The hub automatically

reconnects this port when a data packet longer than 512 bits (normal) is transmitted

by the partitioned port without collision. This applies to all RJ-45 station ports, as

well as the AUI/BNC backbone ports.

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