AT&T StarLAN 10 User manual

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©1990 AT&T
All Rights Reserved
Printed In USA
NOTICE
The information in this document is subject to change without notice.
AT&T assumes no responsibility for any errors that may appear
in this
document.
TRADEMARK NOTICE
StarGROUP is atrademark of AT&T.
WARNING: RISK OF ELECTRICAL SHOCK. EQUIPMENT MUST
BE PROPERLY GROUNDED.
Your AT&T equipment requires aproperly grounded 3-prong AC
power receptacle for safe operation. You should have your receptacle
checked by aqualified electrician before connecting this equipment.
Do not cut or remove the third (ground) prong from the AT&T power
cord.
Do not use 2wire extension cords or adapters to defeat the
safety features of your equipment.
If you have a2-prong receptacle,
it is very important to have it replaced with a3-prong receptacle,
installed by aqualified electrician.
WARNING
The equipment described here generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the
installation manual, may cause interference to radio communications.
The equipment has been tested and found to comply with the Iimijs for
aClass Acomputing device pursuant to Subpart Jof Part 15 of FCC
Rules, which are designed to provide reasonable protection against
such interference when operated in acommercial environment.
Operation of this equipment in aresidential area
is likely to cause
interference to radio communications, in which case the user at his
or
herown expense will be required to correct this interference.
This digital apparatus does not exceed the Class Alimits for radio
noise emissions set out
in the radio interference regulations of the
Canadian Department of Communications.
Le present appareil numerique n'emet pas de bruits radioelectriques
depassant les limites applicables aux appareils numeriques de la
classe Aprescrites dans
Ie Reglement sur Ie brouillage radioelectrique
edicte par Ie ministere des Communications du Canada.

/TO ORDER ADDITIONAL COPIES OF THIS DOCUMENT
Contact: Your AT&T Account Team
or
AT&T Customer Information Center, Commercial Sales
P.O. Box 19901
Indianapolis, Indiana 46219
In the U.S. call 1-800-432-6600
Outside the U.S. call 1-317-352-8557
Order: Document No. 999-100-722
UPDATES
AT&T can automatically provide you wijh updates to any StarLAN 10
Network document.
"you wish to be included on the update list, call
the
AT&T Customer Information Center (CIC), ask to be placed on
standing order, and indicate the documents by document number.
The document updates will be shipped to you as they are stocked by
CIC.
)

Contents
About the Hub 1
Features of the Hub 3
What's
In This Guide? 7
To Contact AT&T 9
Before You Install aHub 11
Design Considerations 1;
What's Supplied in aHub Unit Kit? 14
What Else Do
You Need? 16
Network Configurations 19
Hub Locations 20
Sample Network Configwations 21
Distance Guidelines for Connections to aHub 30
Hub Placement 31
Placement Considerations 32
How to Mount aHub 36
Power-Up
LED Test 41
How to Label Hubs 45
Making Connections to aHub 47
General Connection Rules 47
Connections to aHub in aRoom 51
Connections to aHub in aWiring Closet 57
Hub-ta-Hub Connection Between Wiring Closets
66

Verifying Connections to the Hub 77
Interpreting Hub LEOs 79
Tr.ilficLED 82
Collision LED 84
AUI Jab LED
86
Link/Jab LEDs 88
Hub Pin Assignments 91
Glossary 93
Index 99

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About the Hub
AStarLAN 10 Network is a10 Mbits/second CSMNCD local area
network (LAN) that utilizes unshielded twisted-pair wire,
transceiver (AUl) cable, and optical fiber to transmit network
signals between hardware devices.
The Hub is ahardware device that enables you to directly connect
up to 12 devices (including other Hubs), using twisted-pair wire
modular cords
(II devices) and transceiver cable
(I device), in astarconfiguration to form aStarLAN 10 Network.
In addition to connecting StarLAN 10 Network devices to the Hub,
you can connect IEEE Standard 802.3 IOBASE5, Ethernet Version
2.0, and IOBASE2 Cheapemet DCE devices such as coaxial,
broadband, and optical fiber transceivers,
as shown in Figure I.
The Hub was developed with knowledge
of and participation in the
standard-setting process
of IEEE 10BASE-T task force, whose
charge is the development
of standard specifications for
ANSI/lEEE 802.3 LANs that can use unshielded twisted-pair wire
to carry 10 Mbits/sec network signals.
For information on the ANSI/lEEE Standard for Local Area
Networks 802.3, read the Carrier Sense Multiple Access with
Collision Detection (CSMAICD) Manual
and Supplement
published by the IEEE (Institute of Electrical and Electronics
Engineers, Inc.).
About the Hub 1

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2About the Hub

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Features of the Hub
The Hub performs the following functions:
•Distributes Network Signals
The Hub allows you to connect up
to 12 devices that are
capable
of transmitting and receiving network signals. Each
Hub has 10 modular IN jacks (labeled''2" through' 'II' '), a
switchable IN/OUT modularjack (labeled
"I"), and an
Anachment Unit Interface (AUI) port (labeled "AUI"). All of
these connectors are conveniently located on the front of the
Hub, as shown inFigure 2.
The IN jacks are used to connect StarLAN 10 Network
hardware devices via modular cords. The switchable IN/OUT
jack when set to the OUT position is used to interconnect Hubs
via modular cords. The AUI port accepts a
DeE
D-type connector to connect Ethernet-compatible devices
(transceivers) either directly or via transceiver (AUI) cable.
•
Permits Network Expansion
Hubs can be interconnected using twisted-pair wire modular
cords
or via an alternate medium (that is, coaxial, broadband, or
optical fiber).
• Permits Prewiring for Future Nodes
The Hub's INjacks can be prewired to wall jacks at locations
where nodes will be installed at alater date. This feature also
allows nodes
to be disconnected from, and reconnected to, wall
jacks at any time without affecting the network.
About the Hub 3

AGURE 2Hub Components
InllIut Switch
InlOut Jack
In Jacks
AUI Port
IEC Power Connector
4About the Hub
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Traffic LED
Collision LED
Link/Jab LEOs
Link Integrity
Option Switches
AU!
ab LED
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• Implements the IEEE Standard 802.3 Multiport Repeater
Specification
Regenerates Network Signals
The Hub regenerates network signals by retiming received
data frames and regenerating them with the proper
amplitude and pulse shape.
Isolates
Jab Conditions
The advanced circuitry in the Hub isolates and prevents
excessive consecutive collisions (collision storms) and
continuous transmissions Gabber) caused by faulty nodes or
wiring connections. If acollision storm or jabbercondition
is detected at aconnector on the Hub, that connector is
deactivated Gabbed), while the remainder
of the network is
undisturbed. Thejabbed connector is reactivated
automatically when the condition that caused the port to be
isolated has been corrected. Each port on the Hub has a
corresponding LED which is capable
of indicating a jab
.condition. For more information onjab conditions, see
"AUI Jab LED" and "Link/Jab LEOs" in the "Interpreting
Hub LEOs" section laterin this guide.
Detects
and Displays Network Traffic and Collisions
The Hub detects the presence
of network traffic and
collisions. The Hub's traffic and collision LEOs are useful
troubleshooting aids. Formore information on traffic and
collisions, see "Traffic
LED" and "Collision LED" in the
"Interpreting Hub
LEOs" section later in this guide.
Verifies
Link Integrity
The Hub's Link Integrity feature can verify the integrity
of
the receive portion of the twisted-pair wire connection
between each modularjack on the Hub and the twisted-pair
device connected
to thatjack. This feature can be disabled
on an individual jackbasis to provide compatibility with
devices that do not support Link Integrity. To enable
or
disable Link Integrity, use the Link Integrity option switch
(as described in the general connection rules in
"Making
Connections to a Hub" later in this guide). There is one
switch that corresponds
to each modularjack (II switches
and
II modularjacks).
Aboutthe Hub 5

~ Important
The Link Integrity function of devices at both ends of the
twisted-pair wire connection must agree.
For example. if a
jack on the Hub is connected via twisted-pairwire to a
device that has Link Integrity enabled. Link Integrity must
also
be enabled on the Hub for that jack on the Hub. You
must disable the Link Integrity on the Hub if the device
connected to the modular
jack is either not equipped with
Link Integrity or has its Link Integrity disabled. ~
6About the Hub

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What's In This Guide?
This guide explains how to install and troubleshoot the Hub. It
contains the following sections:
•Before You Install a
Hub
This section explains what you receive in aHub Unit Kit and
what additional hardware you need in order to insla1l the Hub in
your wiring environment.
It also discusses the design of your
StarLAN 10 Network.
•Network Configurations
This section explains the basic StarLAN 10 Network
configurations that are possible using Hubs. It also provides
illustrations of sample Hub configurations. In addition, this
section provides atable
of maximum distances between the
Hub and compatible components.
•
Hub Placement
This section describes environmental. electrical, and space
requirements for the Hub.
It also includes aprocedure for
testing the Hub's LEDs. and step-by-step procedures for
mounting and labeling Hubs.
•
Making Connections to a Hub
This section describes how to connect Hubs in aroom or a
wiring closet using avariety of connection media.
•Verifying Connections to the Hub
This section provides aprocedure for verifying that the
connections to the Hub's AU! port and modularjacks are good.
•
Interpreting Hub LEOs
This section describes how to use the Hub's LEDs
to detect and
isolate network problems.
•
Hub Pin Assignments
This section provides pin assignments for modularjacks and the
AU! port on the Hub. This information is helpful in
troubleshooting networks comprised of equipment that has pin
assignments different from those used in AT&T equipment.
About the Hub 7

•Glossary
This section explains technical teons for readers who are
unfamiliar with communications wiring environments and local
area networlcs.
8About the Hub

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To Contact AT&T
For Help with Hub Problems
If you have aproblem with your Hub. contact your networl<
administrator. IT the problem persists. your networl< administrator
can call arepresentative at the original place
of purchase. IT you
purchased the Hub from AT&T. have yournetwork administrator
call the AT&T National System Support Center hotline:
•In the United States and Puerto Rico. dial 1-800-922-0354.
•In Canada. dial 1-800-245-2480.
•
In all other countries. call your authorized AT&T dealer.
For Product Information
For information about StarLAN 10 Networl< components and other
AT&T data networking products. call your AT&T Account
Executive
or the AT&T Advertising Response Center:
•In the United States and Puerto Rico. dial 1-800-247-1212.
•
In Canada. dial 1-800-361-7951.
•
In all other countries. call your authorized AT&T dealer.
For Design or Installation Service
The AT&T Customer Programming Services Center provides afull
range
of services including:
•Detailed review
of yournetworking needs
•Network design
•Installation
of the StarLAN 10 Networl< in non-standard and
non-AT&T wiring environments
For more information about the AT&T Customer Programming
Services Center. contact your AT&T Account Executive
or the
AT&T Advertising Response Center.
For information on installing aStarLAN 10 Networl< in standard
AT&T wiring environments. call arepresentative at the original
place
of purchase. IT you purchased the StarLAN 10 Network from
AT&T. contact your AT&T Account Executive.
About the Hub 9

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Before You Install aHub
Before installing aHub, you should verify the contents of the Hub
Unit
Kit and detennine what, if any, additional hardware is
required to install the Hub.
You also should contact your network
administrator for acopy
of the network configuration design and
for
any additional hardware required for the installation.
Design Considerations
To ensure proper installation of the StarLAN 10 Network, you
should have anetwork configuration design that specifies all
of the
components to be installed
in each room and wiring closet (if
applicable). The StarLAN 10 Network Hub Unit Design Form,
shown on the next page, is used to identify the hardware devices to
be connected to aHub.
If you don't have anetwork configuration design, it is important for
you to realize that there are maximum distance and delay
guidelines associated with aStarLAN 10 Network.
Your network
must confonn to these distance and delay guidelines.
If you are installing aStarLAN 10 Network that will use the
building's existing twisted-pair wiring, you also should have a
basic understanding
of the wiring environment in which you intend
to install components.
For infonnation about StarLAN 10 Network configurations, read
the
"Network Configurations" section in this guide or refer to the
StarLAN 10 Network Hardware Design Guide.
Before You Install aHub 11

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StarLAN
10
Network
Hub
Unit
Design
Form
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Organization:
Hub
Location:
Network Designer:
Hub
Serial Number: _
Date: _
Hub
10:
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Building:
Hub
Purchase Date: _
Cord Length: _ Cord Length: _
IN
or
OUT JACK
1:
Node Name
or
Hub
10:
_
User: _
Location: Cord Length: _
Link
Integrity
Setting:
JACK 2:
Node
Name
or
Hub
10:
_
User: _
Location: Cord Length: _
Link
Integrity
Setting:
JACK
7:
Node Name or Hub
ID:
_
User: _
Location:
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Link
Integrity
Setting:
JACK 8:
Node Name
or
Hub 10: _
User: _
Location:
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Link
Integrity
Setting:

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JACK
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Node
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Hub
10:
Node
Name
or
Hub
10:
User: User:
Location: Cord Length: Location: Cord Length:
Link Integrity Setting: Link Integrity Setting:
JACK
4:
JACK
10:
Node
Name
or
Hub
10:
Node
Name
or
Hub
10:
User: User:
Location: Cord Length: Location: Cord Length:
Link Integrity Setting: Link Integrity Setting:
JACK
5:
JACK
11:
Node
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Hub
10:
Node
Name
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Hub
10:
User: User:
Location: Cord Length: Location:
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Link
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What's Supplied in aHub Unit Kit?
The Hub Unit Kit. illustrated in Figure 3. contains the following
components:
a
AHub
b A bracket for mounting the Hub on the wall
CFour wall anchor.; for mounting the Hub on wallboard
dFour
No.8 XI-inch (2.5 centimeter) panhead sheet-metal
screws to hold the bracket on the wall
e A UL/CSA listed SIT-type power cable for connecting the
Hub's internal power supply to commercial power
If any of the items are missing or damaged. return the kit to the
original place of purchase.
14 Before You Install aHub

FIGURE 3 Hub Unit Kit
)
B8for8 You Install aHub 15

What Else Do You Need?
Based on the network configuration you intend to install. and the
type
of wiring environment you are working in. you may need one
or more of the cords listed in Table I.
TABLE 1Modular Cords and Cables for Hub Connections
Type Lengths Environments
D8W 2.5 ft. (76 em) Hub to Hub, or Hub to
wiring closet cross
connect
DW8A-DE 10
ft. (3.0 m)
25
ft.
(7.6 m)
50 ft. (15.2 m)
75 ft. (22.8 m)
100 ft. (30.5 m)
150 ft. (45.7 m)
200 ft. (60.9 m)
DW8A-SE 10
ft.
(3.0 m)
25
ft.
(7.6 m)
50 ft. (15.2 m)
DP8B-DE 10
ft. (3.0 m)
(plenum 25
ft.
(7.6 m)
cord)
50 ft. (15.2 m)
75
ft. (22.8 m)
100
ft. (30.5 m)
150
ft. (45.7 m)
200
ft. (60.9 m)
AU! 33 ft. (10.0
m)
transceiver 100
ft. (30.0 m)
cable 165
ft. (50.0 m)
Hub to node. Hub to
Hub.
or Hub to wiring
closet cross connect
Hub to 66-type wiring
closet cross connect
Hub to node, Hub to
Hub,
or Hub to wiring
closet cross connect
through plenums.
(plenum cord is afire
resistant, low smoke
producing cord for use in
ceiling/wall locations.)
Hub to Ethernet
transceiver
16 Before You Install aHub