Intel 100BASE-TX User Manual

Intel Express
100BASE-TX
Stackable Hub
User Guide

© 1995 by Intel Corporation. All rights reserved.
†Other brand and product names are registered trademarks or trademarks of their respective

holders.

Statement of Conditions

In the interest of improving internal design, operational function, or reliability, Intel Corp.
reserves the right to make changes to the products described in this document without notice.

Intel Corp. does not assume any liability that may occur due to the use or application of the
products or circuit layouts described herein.

Federal Communications Commission (FCC) Statement

Note: 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. If it is not
installed and used in accordance with the instruction manual, it may cause harmful interference to
radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference, in which case users will be required to take whatever measures may be necessary to
correct the interference at their own expense.

EN 55 022 Declaration of Conformance

This is to certify that the Intel Express 100BASE-TX Stackable Hub is shielded against the
generation of radio interference in accordance with the application of Council Directive
89/336/EEC, Article 4a. Conformity is declared by the application of EN 55 022:1987 Class B
(CISPR 22:1985/BS 6527:1988).

Compliance with the applicable regulations is dependent upon the use of shielded cables.

Bestätigung des Herstellers/Importeurs

Es wird hiermit bestätigt, daß das 100BASE-TX Stackable Hub gemäß der im BMPT-AmtsblVfg
243/1991 und Vfg 46/1992 aufgeführten Bestimmungen entstört ist. Das vorschriftsmäßige
Betreiben einiger Geräte (z.B. Testsender) kann jedoch gewissen Beschränkungen unterliegen.
Lesen Sie dazu bitte die Anmerkungen in der Betriebsanleitung.

Das Bundesamt für Zulassungen in der Telekommunikation wurde davon unterrichtet, daß dieses
Gerät auf den Markt gebracht wurde und es ist berechtigt, die Serie auf die Erfüllung der
Vorschriften hin zu überprüfen.

Die Erfüllung der zutreffenden Vorschriften hängt von der Benutzung geschirmter Kabel ab. Der
Benutzer ist für den Erwerb der entsprechenden Kabel verantwortlich.

iii

Certificate of the Manufacturer/Importer

It is hereby certified that the 100BASE-TX Stackable Hub has been suppressed in accordance with
the conditions set out in the BMPT-AmtsblVfg 243/1991 and Vfg 46/1992. The operation of some
equipment (for example, test transmitters) in accordance with the regulations may, however, be
subject to certain restrictions. Please refer to the notes in the operating instructions.

Federal Office for Telecommunications Approvals has been notified of the placing of this
equipment on the market and has been granted the right to test the series for compliance with the
regulations.

Compliance with the applicable regulations is dependent upon the use of shielded cables. It is the
responsibility of the user to procure the appropriate cables.

Voluntary Control Council for Interference (VCCI) Statement

This equipment is in the 1st category (information equipment to be used in commercial and/or
industrial areas) and conforms to the standards set by the Voluntary Control Council for
Interference by Data Processing Equipment and Electronic Office Machines that are aimed at
preventing radio interference in commercial and/or industrial areas.

Consequently, when this equipment is used in a residential area or in an adjacent area thereto,
radio interference may be caused to equipment such as radios and TV receivers.

Compliance with the applicable regulations is dependent upon the use of shielded cables. The user
is responsible for procuring the appropriate cables. Read instructions for correct handling.

Electromagnetic Emissions

Meets requirements of:
FCC Part 15, Subpart B, Class A

EN 55 022 (CISPR 22:1985), Class B
General License VDE 0871, Class B (AmtsblVfg No. 243/1991 and Vfg 46/1992)
VCCI Class 1 ITE

iv

Limited 1-year hardware warranty

Intel warrants to the original owner that the hardware product delivered in this package will be free from defects in material and workmanship. This
warranty does not cover the product if it is damaged in the process of being installed or improperly used.

THE ABOVE WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE ARISING OUT OF
ANY PROPOSAL, SPECIFICATION, OR SAMPLE.

This warranty does not cover replacement of products damaged by abuse, accident, misuse, neglect, alteration, repair, disaster, improper installation, or
improper testing. If the product is found to be defective within one year of purchase, Intel, at its option, will replace or repair the product at no charge
except as set forth below, or refund your purchase price provided that you deliver the product along with a Return Material Authorization (RMA)
number (see below), along with proof of purchase (if not registered), either to the dealer from whom you purchased it or to Intel with an explanation of
any deficiency. If you ship the product, you must assume the risk of damage or loss in transit. You must use the original container (or the equivalent)
and pay the shipping charge.

Intel may replace or repair the product with either new or reconditioned parts, and any part or product replaced becomes Intel’s property. Repaired or
replaced products will be returned at the same revision level as received or higher, at Intel’s option. Intel reserves the right to replace discontinued
product with an equivalent current generation product.

Returning a defective product

From North America:

Before returning any product, contact Intel Customer Support and obtain a Return Material Authorization (RMA) number by calling
[phone].

If the Customer Support Group verifies that the product is defective, they will have the RMA department issue you an RMA number to place on the
outer package of the product. Intel cannot accept any product without an RMA number on the package.

All other locations:

Return the product to the place of purchase for a refund or replacement.

Limitation of liability and remedies

INTEL SHALL HAVE NO LIABILITY FOR ANY INDIRECT, SPECULATIVE, CONSEQUENTIAL, INCIDENTAL, PUNITIVE OR SPECIAL
DAMAGES ARISING FROM THE USE OF OR INABILITY TO USE THIS PRODUCT INCLUDING, WITHOUT LIMITATION, LOSS OF
USE, BUSINESS INTERRUPTIONS, LOSS OF PROFITS, AND LOSS OF GOODWILL, WHETHER ANY SUCH DAMAGES ARISE OUT
OF CONTRACT NEGLIGENCE, TORT, OR UNDER ANY WARRANTY, IRRESPECTIVE OF WHETHER INTEL HAS ADVANCE NOTICE
OF THE POSSIBILITY OF ANY SUCH DAMAGES. NOTWITHSTANDING THE FOREGOING, INTEL’S TOTAL LIABILITY FOR ALL
CLAIMS UNDER THIS AGREEMENT SHALL NOT EXCEED THE PRICE PAID FOR THE PRODUCT. THESE LIMITATIONS ON
POTENTIAL LIABILITIES WERE AN ESSENTIAL ELEMENT IN SETTING THE PRODUCT PRICE. INTEL NEITHER ASSUMES NOR
AUTHORIZES ANYONE TO ASSUME FOR IT ANY OTHER LIABILITIES.

Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations may not apply to you.

Software provided with the hardware product is not covered under the hardware warranty described above. See the applicable software license
agreement which shipped with the product for details on any software warranty.

August 23, 1995

v

Contents

Chapter 1 Overview....................................................1

Features...............................................................................................1

Physical Description...........................................................................2

Chassis............................................................................................3

Front Panel......................................................................................4

Rear Panel.......................................................................................9

Chapter 2 Installing and Removing the

Express Hub .........................................11

Site Preparation................................................................................12

Package Contents..............................................................................13

Required Tools and Materials..........................................................13

Installing an Express hub.................................................................14

Installing the Hub in a Rack.........................................................14

Installing the Hub on a Table or Shelf.........................................15

Completing the Installation..........................................................15

Installing Multiple Hubs..................................................................17

Stacking and Cascading Hubs......................................................17

Physical Requirements for Installing Multiple Hubs..................17

Installing and Connecting Multiple Hubs....................................19

Removing an Express hub................................................................20

Removing and Installing Filler Panels.............................................21

Chapter 3 Physical Configuration Guidelines........ 23

Making Connections to 100BASE-T Ports......................................23

Network Configuration Decisions................................................24

100 Mbps Network Devices.........................................................24

Connecting Cables to the Hub......................................................25

Verifying Installation.......................................................................26

Checking the LEDs.......................................................................26

Other Items To Check ..................................................................27

Unit Numbering Convention............................................................28

100BASE-T Network Configurations..............................................29

100BASE-T Shared LAN .............................................................29

100BASE-T Switched LAN..........................................................31

i

Appendix A Technical Specifications and Optional

Equipment................................................33

Technical Specifications..................................................................33

Optional Equipment .........................................................................35

Media Adapters ............................................................................35

Network Management Module.....................................................36

100BASE-TX Host Modules........................................................36

Appendix B 100BASE-T Topology Rules and

Guidelines.................................................39

Physical Layer Media Specifications...............................................39

Repeater Rules..................................................................................40

Network Topology Extensions.....................................................41

Calculating Round Trip Collision Delay .....................................44

Index ...................................................................46

Intel customer support....................................................52

ii

Overview

This chapter introduces the Intel Express 100BASE-TX stackable hub
and covers the following topics:

• A summary of the key features of the Express hub

• A physical description of the Express hub and its components

• A description of the upcoming optional equipment supported by

the Express hub

Features

The key features of the Express hub are

• IEEE 802.3u standard for Fast (100 Mbps) Ethernet conformity

• Scaleable architecture that allows up to six hubs to be stacked for

a total of 144 fixed ports per single, shared repeater or collision
domain.

• Stackable, self-contained chassis equipped with:

– 12 100BASE-TX fixed ports.
– LED matrix that provides at-a-glance status for the individual

ports on a hub, the hub, or an entire stack of hubs, and provides
network utilization status for the Ethernet segment in a stack of
hubs.

– Expansion slot to accommodate modules supporting

management and additional connectivity capabilities.

1

C H A P T E R 1 Intel Express 100BASE-TX Stackable Hub

– 100BASE-T Media adapter slot to accommodate an optional

media adapter that allows the repeater to be connected to other
100BASE-T network devices.

– MDI/MDI-X push-button switch that allows 100BASE-T port 1

to be configured to connect to a 100BASE-T switch or other
100BASE-T internetworking device, such as a router, using a
straight-through cable.

Physical Description

The Express hub is a stackable hub that is designed to efficiently
handle both the needs of your 100BASE-T network today and the
increasing needs of your network as it expands in the future. The
Express hub provides 12 100BASE-T ports with RJ-45 connectors for
connection to 12 end stations operating at 100 Mbps. In addition, the
hub provides slots that accommodate various modules to further your
network capabilities.

This section provides physical descriptions of the chassis and the front
and rear panels of the Express hub. See Appendix A “Technical
Specifications and Optional Equipment” for a description of optional
modules supported by the Express hub.

2

CHAPTER 1 Overview

Chassis

The Express hub components are enclosed in a 19-inch (48.26­centimeter) wide chassis, which is 1.5 EIA rack-mount spaces high.
The chassis consists of a metal frame and a plastic front panel, and it
contains components that are pertinent to the operation of the hub.

Cover

Motherboard

Fans

Intel

100BASE-TX Stackable Hub

Express

Technology by
Bay Networks

Power
supply

Front panel

5905

Express 100BASE-TX stackable hub

Major Components

The chassis contains the following major components:

• Motherboard

• AC power supply

• Two fans

The motherboard in the Express hub contains the circuitry that drives
and processes all 100BASE-T repeater functions.

The Express hub is equipped with a 120/240 V AC universal power
supply. All components and plug-in modules derive their power from
the AC power supply.

The hub is equipped with two fans that cool the hub components and
ensure normal operation.

3

C H A P T E R 1 Intel Express 100BASE-TX Stackable Hub

Front Panel

The front panel of the Express hub provides 12 100BASE-T ports, an
MDI/MDI-X switch, an LED matrix, a media adapter slot, and an
expansion slot.

Media Adapter

Front panel of the Express 100BASE-TX stackable hub

RJ-45 100BASE-TX Ports

The front panel of the Express hub provides 12 100BASE-TX ports
with fixed RJ-45 connectors for connectivity to 100BASE-T network
devices. These standard RJ-45 connectors accept Category 5
unshielded twisted pair (UTP) or 100-ohm shielded twisted pair (STP)
cable. The RJ-45 interface consists of an 8-pin connector configured
for MDI-X wiring.

24365871091211

MDI-X/MDI

1

100 BASE-TX

Expansion Slot

Technology by
Bay Networks

Intel Express

100BASE-TX Stackable Hub

²1 5 10 15 25 ³30

Pwr Stat RPS Col Data %

Media Adapter

Expansion Slot

1

Port Status

Management

1132143154165176187198209211022112312

Stat Enbl

Stat

Mstr

24

5895

This table provides the pinout information for the standard RJ-45
connector configured for MDI-X wiring, and the pinout information
for port 1 RJ-45 connector when configured for MDI wiring.

Pin # MDI-X signal MDI signal

(port 1)

18

3165.1

4

1
2
3
4
5
6
7
8

Receive data + (RD+)
Receive data - (RD-)
Transmit data + (TD+)
Not assigned
Not assigned
Transmit data - (TD-)
Not assigned
Not assigned

TD+
TD­RD+
Not assigned
Not assigned
RD­Not assigned
Not assigned

CHAPTER 1 Overview

The maximum cable distance between the port and the attached device
is 100 meters (328 feet), including all patch cables, panels, and
connectors.

MDI/MDI-X Switch

The MDI/MDI-X switch on the front panel of the Express hub is a
recessed push-button switch that allows you to select MDI or MDI-X
wiring for port 1. As indicated on the front panel, port 1 is configured
for MDI-X wiring when the push button is in the out position. When
the push button is pressed in, port 1 is configured for MDI wiring.

The MDI/MDI-X switch eliminates the need to use a crossover cable
if you are connecting similar devices. Use the following guidelines to
configure port 1 for MDI or MDI-X wiring:

• Configure port 1 for MDI-X wiring if the remote end of the cable

is connecting to an MDI-wired device (such as a network station
or a router).

• Configure port 1 for MDI wiring if the remote end of the cable is

connecting to an MDI-X device, such as a 10/100 Mbps switch.

MDI-X ports 2 through 12 cannot be configured for MDI wiring. If
you are using one of these ports to connect to another MDI-X port,
you must use an RJ-45 crossover cable to connect the two ports.

LED Matrix

The LED matrix on the front panel of the Express hub allows you to
identify:

• The status of the hub AC power supply.

• The operational status of the hub.

• A collision occurrence on an Ethernet segment in a standalone hub

or a stack of hubs.

• The network utilization of the Ethernet segment in a standalone

hub or a stack of hubs.

• The status of the expansion module or the status and mode of a

network management module (NMM) installed in the expansion
slot.

• The status for all ports in the hub, including port 1 on the optional

media adapter when installed in the media adapter slot.

5

C H A P T E R 1 Intel Express 100BASE-TX Stackable Hub

This shows the LED matrix on the Express hub.

100BASE-T Hub

Pwr Stat RPS Col Data %

1

Media Adapter
Port Status

1132143154165176187198209211022112312

1 5 10 20 35 50

Management

Expansion Slot

Stat Enbl

Mstr

LED matrix on the Express hub

Type Label Color Meaning

Stat

24

5897

Hub power supply status Pwr Green

Off

Hub status Stat Green

Hub is receiving AC power.
Hub is not receiving AC power.
Hub is powered, has passed the confidence test, and

is operating normally.

Amber

At initial power up, this LED lights to indicate the
hub is running its confidence test. If this LED lights
after the confidence test is performed, it indicates the
hub is not operating normally due to a fan failure, a
hub power supply failure, or a confidence test failure.

Off

Hub is not receiving power.
Not used RPS N/A N/A
Collision

Col Amber

A collision event has been detected.
status

Off

Network utilization Data % Blinking

green

Collisions are not detected on the segment.

The ≤1% LED blinks green to indicate there is traffic

on the segment that is utilizing less than 1% of the

network.

Solid green

The Data % LEDs light solid green to indicate the

percentage of the network utilization for the Ethernet

segment in a standalone hub or a stack of hubs. These

LEDs operate as a bar graph to provide you with a

continuous indication of the network utilization. For

example, if the 1% and 5% Data LED light green, the

Ethernet segment in that stack of hubs is utilizing 5%

of the network.

6

CHAPTER 1 Overview

Type Label Color Meaning

100BASE-T Media
adapter status

Expansion slot module
status

Management status Stat

Port status
(hub ports)

Port status
(optional ports)

Media
Adapter 1

Expansion
Slot Stat

Mstr

Enbl

Port
Status
1—12

13—24

Green

Amber
Off

Green

Amber
Off
Green

Amber
Green

Off

Green

Off
Green
Amber
Off

A media adapter is installed in the media adapter slot,

link status is good, and the port is not partitioned.

Link status is good and the port is partitioned.

Link status is not detected or a media adapter is not

installed in the media adapter slot.

The module in the expansion slot has passed the

confidence test and is operating normally.

The module in the expansion slot has failed.

There is no module installed in the expansion slot.

The NMM has passed the confidence test and is

operating normally.

The NMM has failed.

The NMM installed in the hub is the master NMM

for a stack of hubs.

The NMM installed in the hub is not the master

NMM for that stack of hubs.

The hub is properly connected to the other hubs in

the stack and is actively managed by an NMM.

The hub is not managed by an NMM.

Link status is good; port is not partitioned.

Link status is good; port is partitioned.

Link status is not detected; port may or may not be

partitioned.

7

C H A P T E R 1 Intel Express 100BASE-TX Stackable Hub

e

E

100BASE-T Media Adapter Slot

The media adapter slot is located in the upper left-hand corner of the
Express hub and accommodates an optional 100BASE-T media
adapter. A 100BASE-T media adapter allows you to connect to other
100BASE-T network devices using a different media.

Media adapter slot Expansion slot

Media adapter and expansion slots in the Express hub

For more information about the optional media adapter, see “Media
Adapters” later in this chapter.

Technology by
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5906

Int

100BAS

Expansion Slot

The expansion slot is located in the lower half of the Express hub and
accommodates several optional 100BASE-T modules that extend your
networking capabilities.

The following 100BASE-T modules can be installed in the expansion
slot:

• 100BASE-T NMM

• 100BASE-TX host module

For information about these modules, see “Optional Equipment” in
Appendix A.

8

CHAPTER 1 Overview

Rear Panel

The rear panel of the Express hub provides an AC power receptacle, a
Redundant Power connector, and two cascade cable connectors.

100-240V

5.0-3.0A
47-63HZ

Redundant Power

Cascade Down Cascade Up

Unit Position

1
2
3

5898

Rear panel of the Express hub

Power Receptacle

The AC power receptacle is provided for connection to the AC power
outlet. The Express hub accepts between 100 and 240 V AC.

Cascade Connectors

The Cascade Down and Cascade Up connectors and an Intel cascade
cable allow you to stack and link multiple Express hubs so you can
expand port connections at a particular workgroup in your network.
The cascade cable connects to the Cascade Down cable on the top hub
and the Cascade Up cable on the bottom hub.

Cascade

down

Cascade
up

Cascade cable connections

5903

9

C H A P T E R 1 Intel Express 100BASE-TX Stackable Hub

The cascade cable extends the functionality of one hub to a maximum
of six hubs in a stack. This stack then functions as a single repeater or
collision domain. The cascade cable daisy chain creates a cascade bus
that carries the following information to each hub in the stack:

• Multidrop repeater Ethernet segment information—allows you to

have a total of 72 fixed ports on one segment. When the optional
100BASE-T host module is installed in the expansion slot on each
hub, the Ethernet segment supports up to 144 ports.

• Stack management information—allows one NMM to manage

every hub in the stack.

• Port statistics—distributes configuration and status information

for each port in the stack to an NMM and network management
system.

• Daisy chain unit number information—provides a sequential

numbering convention for a stack of up to six hubs. For
information about the unit numbering convention, see “Unit
Numbering Convention” in Chapter 3, “Physical Configuration
Guidelines.”

10