Compaq Netelligent 1017A/B User manual

©1997 Compaq Computer Corporation.All rights reserved.
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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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.
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 1017A/B 10Base-T Hub User Guide
Second Edition (August 1997)
Part Number 167175-002

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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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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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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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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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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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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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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.