Compaq Netelligent 1009B 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 1009B
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 1009B 10Base-T Hub User Guide
Second Edition (August 1997)
Part Number 167174-002

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Contents
Chapter 1
Introduction
Features.........................................................................................................................1-1
Chapter 2
Hardware Description
Front Panel....................................................................................................................2-1
LED Indicator Panel..............................................................................................2-1
Back Panel ....................................................................................................................2-6
Port Connections ...................................................................................................2-6
Chapter 3
Installing the Hub
Site Requirements.........................................................................................................3-1
Connecting the Hub System .........................................................................................3-2
Chapter 4
Configurations
Stand-Alone Configuration...........................................................................................4-1
Connecting Multiple Hubs............................................................................................4-2
Using Crossover Twisted-Pair Cable ....................................................................4-3
Using the BNC Port...............................................................................................4-4
Guidelines for Multiple Hub Configuration.................................................................4-5
Appendix A
Troubleshooting
Appendix B
Port and Cable Pin Assignments

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Appendix C
Specifications
Appendix D
Regulatory Standards Compliance
Index

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Preface
About this Guide
This user guide is designed for the experienced network installer. It covers the
following information to help in the installation and configuration of the
Netelligent 1009B 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.
QNetelligent 1009B 10Base-T Hub
QBNC T-type connector
QPower adapter
QCompaq Netelligent User Guide CD
QCompaq Netelligent 10Base-T Hub Quick Install Guide
QWarranty registration card
If any parts are incorrect, missing, or damaged, contact your Compaq
Authorized Reseller. If possible, retain the carton and original packing materials
in case you need to repack the contents and return the hub for repair.
NOTE : To qualify your 1009B hub for a lifetime warranty, fill in the warranty
registration card and return it to Compaq Computer Corporation at the address
indicated on the card.

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Chapter 1
Introduction
The Netelligent 1009B 10Base-T Hub is an 8-port Ethernet hub featuring 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 Netelligent 1009B 10Base-T hub 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
Eight independent RJ-45 ports – enables network connections using
10Base-T twisted-pair cable
Cascading – lets you connect the 1009B hub to another 1009B or compatible
hub using the hub’s uplink port
BNC Port – lets you connect the hub to 10Base2 (BNC) cabling
IEEE 802.3 Compliant – conforms to IEEE 802.3 repeater specification, as
well as the 10Base-T and 10Base2 standards

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Chapter 2
Hardware Description
The Netelligent 1009B 10Base-T Hub is 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 LED indicators are located.
Front Panel
This section describes the 1009B hub’s front panel.
Figure 2-1 . 1009B Hub Front Panel
LED Indicator Panel
The LED indicator panel let you easily monitor the status of each port and the
overall condition of the hub. The following sections describe the function of
each indicator.
Power
Color: Green
Label: Power
Function: Power indicator

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LED Activity Condition Indication
STEADY LIGHT ON Hub is receiving power.
NO LIGHT OFF Power is disconnected; no power received.
Utilization
The Utilization LEDs indicate the percentage of network bandwidth used by
valid data. The hub updates this display every 0.5 seconds.
Figure 2-2 . Utilization/Collision Indicators
Label (%) Color Function
1% 5% 15% Green Indicates percentage utilization of LAN
30% 65+% Amber
(yellow)
bandwidth.
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 random wait period. Because wait periods
differ among devices, successive collisions become increasingly improbable.
The Collision LEDs help you monitor the percentage of packet collisions that
occur 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.

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Figure 2-3 . Partition/Link Traffic LEDs
Partition
LED Activity Condition Indication
STEADY YELLOW
LIGHT
PARTITION Indicates port partitioning due to a cable error or
other abnormal network condition.
NO LIGHT OFF Port is in good condition.
A port is temporarily partitioned when a line error or too many collisions are
detected on the attached segment. While it is automatically partitioned, the port
continues to transmit data to the segment. However, data is not repeated from
the segment. When the problem is corrected or a valid data packet is received
through the port, the port is automatically reconnected. When partitioning
occurs, the port’s corresponding Partition LED is continually lit yellow.
Otherwise, this LED should be off.