AT&T StarLAN 10 Network Installation Manual

)

)

©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 a trademark of AT&T.
WARNING: RISK OF ELECTRICAL SHOCK. EQUIPMENT MUST

BE PROPERLY GROUNDED.
Your AT&T equipment requires a properly grounded 3-prong AC

power receptacle for safe operation. You should have your receptacle
checked by a qualified electrician before connecting this equipment.
Do

not cutorremove the third (ground) prong from the AT&T power

cord.

Do

not use 2 wire extension cordsoradapters to defeat the

safety features of your equipment.

If

you have a 2-prong receptacle,
it is very important to have it replaced with a 3-prong receptacle,
installed by a qualified 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

a Class A computing device pursuant to Subpart

J of Part 15 of FCC

Rules, which are designed to provide reasonable protection against
such interference when operated in a commercial environment.
Operation of this equipment in a residential 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 A limits 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 A prescrites dans

Ie

Reglement surIebrouillage radioelectrique

edicte

parIeministere des Communications du Canada.

/

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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

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Network document.

"you

wish to be included on the update list, call

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)

Contents

About the Hub 1

Featuresofthe Hub 3
What's

In

This Guide? 7

To Contact AT&T 9

Before You Install a Hub

11

Design Considerations 1;
What's Suppliedina Hub Unit

Kit?

14

What Else

Do

You

Need?

16

Network Configurations 19

Hub Locations

20

Sample Network Configwations

21

Distance Guidelines

for

Connectionstoa Hub 30

Hub Placement

31

Placement Considerations 32
How

to Mount a Hub 36

Power-Up

LED

Test

41

How

to Label Hubs

45

Making Connections to a Hub

47

General Connection Rules

47

Connectionstoa Hubina Room

51

Connectionstoa Hubina Wiring 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

)

About the Hub

A StarLAN 10 Network is a 10 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 a hardware 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 a starconfiguration to form a StarLAN 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 (InstituteofElectrical and Electronics
Engineers, Inc.).

About the Hub 1

IJ IJ

)

-

~

';

:::>

.=

~,;:

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..

_ " I

(!)

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u::~'---

---------'

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til

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.S:

III

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:::l

J:

2 About

the

Hub

)

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 frontofthe
Hub, as shown in Figure 2.

The IN jacks are used to connect StarLAN 10 Network

hardware devices via modular cords. The switchable IN/OUT

jack when settothe OUT positionisusedtointerconnect Hubs

via modular cords. The AUI port accepts a

DeE
D-type connectortoconnect 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 a later date. This feature also
allows nodes

to

be disconnected from, and reconnected to, wall

jacksatany time without affecting the network.

About the Hub 3

AGURE

2 Hub Components

InllIut

Switch

InlOut

Jack

In

Jacks

AUI

Port

IEC

Power

Connector

4 About the Hub

d

r-

I

I

II

AI

r-~-

..

f--

li~-

..

f-"

..

f-"

..

f-"

..

-"

-

..

f-"

r--

..

f-"

..

f-"

..

"

..

e-,

'-f-"

r-'

I~

t(

~

1.

I

J

~

~

Traffic

LED

Collision

LED

Link/Jab

LEOs

Link

Integrity

Option

Switches

AU!

ab

LED

)

)

)

•

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

a collision stormorjabbercondition
is detected at a connector on the Hub, that connector is
deactivated Gabbed), while the remainder

of

the network

is

undisturbed. The jabbed 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 later in 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. For more 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 modular jack on the Hub and the twisted-pair
device connected

to

thatjack. This feature can be disabled
on an individual jack basistoprovide 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"

laterinthis guide). Thereisone

switch that corresponds

to

each modularjack

(II

switches

and

II

modularjacks).

Aboutthe Hub 5

~

Important

The

Link Integrity function

of

devices at both endsofthe

twisted-pair wire connection must agree.

For

example.ifa

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 Hubifthe device

connected to the modular

jack

is either

not

equipped with

Link Integrity

or

has its Link Integrity disabled.

~

6 About the Hub

)

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 a Hub Unit Kit and
what additional hardware you need in ordertoinsla1l

the Hub in

your wiring environment.

It

also discusses the designofyour

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 a table

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 a procedure 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 a room

or

a

wiring closet using a variety

of

connection media.

• Verifying Connections to the

Hub

This section provides a procedure for verifying that the
connectionstothe Hub's AU! port and modular jacks 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 comprisedofequipment 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.

8 About the Hub

)

To Contact AT&T

For Help with Hub Problems

If

you have a problem with your Hub. contact your networl<

administrator.

IT

the problem persists. your

networl<

administrator

can call a representative 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 a full

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 a StarLAN 10 Networl< in standard
AT&T wiring environments. call a representative 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

)

)

Before You Install a Hub

Before installing a Hub, you should verify the contentsofthe

Hub

Unit

Kit

and detennine what,ifany, additional hardware is

required to install the Hub.

You

also should contact your network

administrator for a copy

of

the network configuration design and

for

any

additional hardware required for the installation.

Design Considerations

To

ensure proper installationofthe StarLAN 10 Network, you

should have a network 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 a Hub.

If

you

don't

have a network configuration design, it is important for
you to realize that there are maximum distance and delay
guidelines associated with a StarLAN 10 Network.

Your

network

must

confonn

to these distance and delay guidelines.

If

you are installing a StarLAN 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 guideorrefer to the

StarLAN 10 Network Hardware Design Guide.

Before You Install a Hub

11

~

.,

StarLAN

10

Network

Hub

Unit

Design

Form

Jack.1

--;

:1

gl

JadI,2

Jack

n

--[:1

1_1_

J

acl\,4

Jack

.5

--I

tJ

1_1_

Jadl

'6

Jack,7

--I

:11_1_",,,,

Jacklr9

--I

tJ

'_I_Jack.IO

JacUll

--~I

L

Unk

Inlegrity

AUI

Porl

--

SWilches

Ii3

'"

~

CD

~

c:

:;-

!e

g!,

..

:I:

c:

C"

Organization:

Hub

Location:

Network Designer:

Hub

Serial Number: _

Date: _

Hub

10:

_

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:

_

Link

Integrity

Setting:

JACK 8:

Node Name

or

Hub 10: _

User: _

Location:

_

Link

Integrity

Setting:

'---"

"'--'

J

JACK

3:

JACK

9:

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

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

Name or

Hub

10:

Node

Name

or

Hub

10:

User: User:

Location:

Cord Length: Location:

Cord

Length:

'"

Link

Integrity Setting: Link Integrity Setting:

~

iii

JACK

6:

AUI PORT:

~

Node

Name

or

Hub

10:

Node Name

or

Hub

10:

c

5"

User:

User:

~

location:

Cord

Length:

Location:

Cord Length:

~

III

Link Integrity Setting:

::I:

c

Notes:

CT

~

Col

What's Supplied in a Hub 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

C Four wall anchor.; for mounting the Hub on wallboard

d Four

No.8

X I-inch (2.5 centimeter) panhead sheet-metal

screwstohold the bracket on the wall

e A UL/CSA listed SIT-type power cable for connecting the

Hub's internal power supplytocommercial power

If

any

of

the items are missingordamaged. return the kit to the

original placeofpurchase.

14 Before You Install a Hub

FIGURE3Hub

Unit Kit

)

B8for8 You Install a Hub 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

moreofthe cords listed in Table I.

TABLE

1 Modular Cords and Cables for Hub Connections

Type

Lengths

Environments

D8W

2.5

ft.

(76 em) Hub to Hub,orHub 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 a fire
resistant, low smoke

producing cord for use in
ceiling/wall locations.)

Hub

to Ethernet

transceiver

16

Before You Install a Hub

)

)

)

Your installation also may require oneormoreofthe following:

• 356A Adapter (11O-type wiring

closet)-used

to connect

modular cords to a 25-pair cable.

• 451A Adapter (Hub to

node)-used

to join two modular cords.

• Fiber Adapter (Hub to

Hub)-

used to connect modular cord

to

optical fiber.

• Power strip---used to connect more than one Hub to a single
electrical receptacle.

• A UL/CSA listed SIT-type extension cord to connect a Hub to
an electrical receptacle that is more than 7 feet away from the
Hub.

•

If

you intend to access commercial power via a 220 volt outlet,
you must purchase and use a UL/CSA listed 220 volt power
cord

of

the appropriate length, type SIT, 3 conductor,

18AWG,

configured for NEMA6-15.

• Rack mounting bracket--used to mount multiple Hubs, Fiber
Adapters, and Fiber Hubs.

If

you do not have the appropriate hardware for your installation,
have your network administrator call your AT&T Account
Executive

or

the AT&T Advertising Response Center.

Before

You

Install a Hub 17

)

)

)

Network Configurations

The Hubiscompatible with all StarLAN 10 Network components.
The Hub supports a variety

of

industry standard IEEE 802.3

IOBASE5, Ethernet, and IOBASE2 Cheapernet DCE devices such

as coaxial, broadband, and optical fiber transceivers. The Hub also
supports the IOBASE-T standard specifications currently being
developed by the IEEE IOBASE-T task force for ANSlIIEEE 802.3
LANs utilizing unshielded twisted-pair wire media

at a IOMbit/sec

transmission rate.
All StarLAN 10 Networks, regardless

of

their size, are installed in

a star

or

multiple-star configuration. In a StarLAN 10 Network

with more than one Hub, each Hub

is

considered a peer (there is no

hierarchy relative to the distribution

of

traffic over the network).

However, when you install a StarLAN 10 Network that uses
building wire, that building wire typically is installed in a
hierarchical fashion (that is, rooms are wired to satellite wiring
closets, which are in tum wired to an equipment room).

In

such

cases, it is important

to understand that any resulting hierarchical

configuration

of

the StarLAN 10 Network is due to the physical

arrangement

of

the building wire.

Network Configurations 19

Hub Locations

You can install a Hub in a roomora wiring closet:

•

If

you are supporting a small networlc (confined to a room)

or

if
there are more devices in the room than available wall jacks,
you should install the Hub in the room.

•

If

you are supporting a larger network (distributed throughout a

floor

or

a building), you should install the Hubs in wiring

closets.

When you install a Hub in a room, you directly connect a device to
the Hub using a modular cord

or

a transceiver (AUI) cable.

When you install a Hub in a wiring closet. you connect a device to
the Hub using a combination

of

media: modular cords, building

twisted-pair wires. optical fiber,

or

transceiver (AUI) cable.

Typical room and wiring closet configurations are discussed in the

next section,

••

Sample Networlc Configurations."

20 Hub Configurations

)

)

Sample Network Configurations

This section contains sample StarLAN 10 Networlc configurations.

Each configuration is subject to maximum distance and delay
guidelines that must be observed in order for the network to
function properly.

The following sections contain information about maximum
distance and delay guidelines:

•

For

information on maximum distances between various

devices connected to a Hub. see the "Distance Guidelines for

Connections to a

Hub"

section in this guide.

•

For

information on the maximum distances and delay

guidelines for StarLAN

10

Networlcs in general, see the

StarLAN 10 Network Hardware Design Guide.

Network Configurations

21

Single Room Configuration

In

a room configuration, StarLAN 10 Networlc devices are

connected directly to one

or

more Hubs using modular cords,

as

shown in Figure 4. An Ethernet transceiver can also

be

connected

to a Hub via transceiver (AUI) cable.
Hubs should

be located in the room wherever it is convenientfor

routing modular cords and accessing an electrical

outlet

FIGURE

4 Single Room Configuration

Hub

22

Hub Configurations

)

Wiring Closet Supporting Single or Multiple

Rooms Configuration

In

this configuration, oneormore Hubs are mounted in a wiring

closet

The Hubs are connected to twisted-pair wires at the cross

connects in the wiring closet, which are in tum connected to wall

jacks

in one

or

more rooms. StarLAN 10 Network devices then are

connected

to the wall jacks using modular cords. Figure 5

illustrates this type

of

configuration.

FIGURE

5 Wiring Closet to Multiple Rooms Configuration

Room

)

)

Wiring

Closet

I

356A

Cross

Adapter

Connects

Room

Network Configurations 23

Hub in a Wiring Closet Supporting Hub in a
Room Configuration

This configurationissimilar to the previous configuration, except
the number

of

StarLAN 10 Networlc devices to be connected

exceeds the number

of

wall jacks available in the room. In this

case, a Hub is installed in the wiring closet and is connected
through a wall

jack

to another Hub installed in the room. The Hub

installed in the room provides connections for up to

II

other

StarLAN 10 Network devices (including other Hubs). Figure 6

illustrates this

type

of

configuration.

FIGURE

6 Wiring Closet to Hub in a Room COnfiguration

Wiring

Closet

Room

I

•

•

•

:

o

~

24

Hub Configurations

)

)

Multiple Wiring Closet Configuration

In this configuration. Hubs installed in wiring closets (that provide
service to different areas

or

floorsofthe building) are connected
together using building wire and/or optical fiber to create a singIe­building-wide StarLAN

IO

Network,

as

shown in Figure 7.

Optical fiber is an ideal medium for interconnecting Hubs in
different wiring

closets-

offering both increased working

distances and network transmissions free

of

electrical noise
generated by other devices in the building. When connecting Hubs
via optical fiber, a StarLAN

IO

Network Fiber Adapter is required

for each Hub-to-optical fiber pair, as shown in Figure

8.

Network Configurations

25

FIGURE

7 MUltiple Wiring Closet Configuration

R

W"

CI

t

iring

ose

oom

[II

/

\-,

I

I

,.1L:-

/-l

..-

&I

IX

1\

/

1\/

Room

[:,

..

c::'

M •

[II

•

•

1/

\

1/

\

•

Ii

\

•

L..

....

'-- '--

\-,

I

•

•

/-l

D

~

"-

Wiring

Closet

Room

[II

h

I

..L::-n

~

~'-

~

rmI

IX

:X

:x

Room

•

...

[II

...

•

•

•

\h

I

\..'--

'--

I

•

•

~

D

~

'-

26 Hub Configurations

FIGURE

8 Multiple Wiring Closet Configuration Using Optical

Fiber

Fiber

Adapter

•

/"

h

I

~/

~

,..I..t:;-

f-'

~

X

X

IX

Room

•

I

,-

......

\

'-- '--

'---'

h

I

~

D

f-'

III

'-

Wiring

Closet

Room

Fiber

Adapter

•

h

I

~/

,-----

.----,

I I

.-

f-'

X

IX IX

Room

rl=t

•

...

'-

......

\.'--

'---'

h

I

f-'

-

D

III

'-

)

)

)

Wiring

Closet

Room

Networl<

Configurations 27

Building-to-Building Configuration

In

this configuration. Hubs installed in wiring closetsofdifferent

buildings are connected together using optical fiber to fonn a

building-to-building StarLAN

IO

Networlc. This configuration

requires a StarLAN

IO

Networlc Fiber Adapter for each Hub-to-

optical fiber pair connection.
Figure 9 illustrates this type

of

configuration.

28

Hub Configurations

)

c

.2

)

1U

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Cl

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Network Configurations 29

Distance Guidelines for Connections

to a Hub

Regardlessofthe network configuration you choose, whenever you
connect a device

to

a Hub. certain distance guidelines must be
observed. These guidelines vary accordingtothe typeofdevice
being connected and the connection medium being used.

Table 2 provides maximum distances for connections between a

Hub and various other devices.

TABLE

2 Wire

and

Transceiver

Cable Distance Guidelines

Distance

Medium Connection Feet Meters

Wire Hub-to-NAU

328*

100*

Wire Hub-to-Hub

328*

100*

Wire Hub-to-AUI

328*

100*

Adapter

Wire Hub-to-Coax

328*

100*

Adapter

Wire

Hub-to-Bridge

328*

100*

Wire Hub-to-Fiber

49

15

Adapter

Transceiver

Hub-to-

164 50

(AUI) Cable Ethernet

Transceiver

• Distance includes

Hub·lO·Cross

CmneCl

Field(s)

30 Huli.Configuralions

)

)

)

Hub Placement

You can set a Hub (horirontally) on a level surface (for example. a

table top. a

fl1ing

cabinet,ora desk top) or mount it (verticaIly) on

a waIl.
Before placing a Hub in a room

or

wiring closet. you must

determine

if

the environmental. electrical. and space requirements

for the Hub are satisfied.

Hub Placement

31

Placement Considerations

You can place

oneormore Hubs in roomsorwiring closets that

satisfy the conditions described

in

the following steps:

1 Determine whether the operational environment for the Hub

meets the following specifications:

Temperature:

Humidity:
Altitude:

oto

50

°C

32 to 122

of

5% to 95% NC

oto 10.000 feet
oto 3.017 meters

~

Note

Where the operational environment differs significantly from
the environment in which the Hub was stored. wait at least two
hours before installing the Hub.

...

32 Hub Placement

2 Be sure thereisa commercial power receptacle within a 7-foot

(2.2-meter) cord distance

of

the Hub.

If

there is no convenient

location within 7 feet (2.2 meters)

of

a receptacle. use a power

strip

or

grounded extension cord to extend the range

of

your

powercable.
The

power requirements for a Hub

are:

Voltage:
Frequency:
Power:

85 to 250 VAC

47

to 63Hz

35W

)

)

The power receptacle must be a non-switched. 3-pronged.
grounded receptacle. There

are

no voltage switches

on

the

Hub. It operates continuously from 85 to 250 VAC.

•

WarnIngs

a Do not use a 3-to-2-pronged adapter at the receptacle; use

of
this typeofadapter may result in electrical shock and/or
damage to the Hub.

b The detachable powercable shipped with the Hub Unit Kit

is

rated only 125 VAC.

If

you intend to access commercial

powervia a 220 volt outlet. you must purchase and use a

UL/CSA listed 220 volt power cable. type SIT. 3 conductor.

18

AWG. configured forNEMA6-I5.....

Hub Placement 33

3

Be

sure to allocate enough space for

• the Hub. A

Hub's

dimensions, including the mounting

bracket, are:

16.5 inches (42 centimeters) in height

3 inches

(8

centimeters) in width

7 inches (18 centimeters) in depth

• the cords that will be connected to the Hub (including the
powercable).

• air circulation.

When you mount a Hub on the wall, allow 5 inches (12
centimeters)

of

clearance between the topofa Hub and

any other object.
When you set a Hub on a level surface, allow 5 inches

(12 centimeters)

of

clearance between the Hub and any
object positioned overthe Hub. Never place an object
directly on top

of

the Hub.

If

you are installing more than one Hub in the same location, it is a
good idea to locate Hubs close to one another to simplify
administration and troubleshooting tasks,

as

shown in Figure 10.

If

you are mounting multiple StarLAN 10 Network wiring devices
within a closet, you may want

to consider rack mounting them.

~

Note

Do

not stack Hubs on topofeachother. Stacking will affect the

heat dissipation capabilities

of

the Hubs.

~

The

next section describes a procedure for mounting a Hub on a

wall in a room

or

wiring closet.

If

you are not mounting your Hub

on

the wall, simply follow Steps 6, 7, and 8ofthe following

procedure.

34

Hub Placement

FIGURE

10

Collocating Hubs In a Room

or

Wiring Closet

ij

•

,-----------------

~

I

~----------

~

,

,.-

-!)

•

•

•

•

•

•

•

o

~

~

B B

B

...

-€>

...

-€>

--

~

•

•

•

•

•

•

• •

•

• •

•

• •

•

)

•

• •

• •

•

•

•

•

• •

•

• •

•

0 0

0

~

~

~

)

Hub Placement 35

How to Mount a Hub

The following procedure describes how to mount a Hub onto
wallboard

or

wood (a stud. heavy wooden paneling. etc.) using the

hardware provided in the Hub Unit

Kit.

If

you are mounting a Hub
on a wall other than the types mentioned above (for example. a
masonry wall). you may need additional mounting hardware.

To mount a Hub. the only tools you need are a flat-blade
screwdriver and a drill with a 3/16-inch bit (when mounting onto
wallboard)

or

a liS-inch bit (when mounting onto wood).

If

you are not mounting your Hub

on

a wall (that is. it will siton a

level surface). skip ahead to Step 6

of

this procedure.

To mount a Hub. follow these steps:

1 Slide the mounting bracket out

of

the Hub.asshown in

Figure

II.

FIGURE

11

Removing

the

Bracket from the Hub

36 Hub Placement

•

)

)

2 Position the bracket on the wall, and carefully mark the location

for each screw with a pencil. The bracket can be mounted with
either end up.

3 Mount the bracket, as shown in Figure

12.

•

If

you are mounting the bracket onto wallboard between

studs:

a Drill four holes for the wall anchors, using a 3/16-inch

bit.

b Insert the wall anchors

and

lightly tap them into place

until they are flush with the wall.

e Position the mounting bracket on the wall so that the

four holes in the bracket line up with the anchors

you

have inserted.

d Insert the sheet-metal screws through the holes in the

mounting bracket and into the wall anchors.

e Screw the mounting bracket onto the wall.

•

If

you are mounting the bracket onto wood:

a Drill four holes for the sheet-metal screws, using a

1/8-

inch bit.

b Position the mounting bracket on the wall so that the

four holes in the bracket line up with the holes you have

drilled.

e Insert the sheet-metal screws through the holes in the

mounting bracket and into the drilled holes.

d Screw the mounting bracket onto the wall.

Hub Placement

37

FIGURE

12

MountIng the Bracket

0

OJ OJ

0

(Wall

anchors

for

wallboard

mounting

only)

--'OJ

6-

e

--

OJ

4 Place the Hub finnly against the wallsothat the mounting

bracket fits into the slots on the back

of

the Hub.

38 Hub Placement

5 Slide the Hub down on the bracket,asshown in Figure

13,

until

it locks into place.

FIGURE

13

Placing the Hub

on

the

Bracket

)

)

--

I II

-.,.

III

II

11

.., 0

II

I v

I I

I I

I n I

I U I

I I

I I

I I

I I

~

I

III

0 J

ill

~

11

..........

II

.....

Hub Placement 39

6 Connect the powercable to the 3-prong

lEC

powerconnector

on the front

of

the Hub, as shown in Figure 14.

FIGURE

14

COnnecting the Power

cable

7 Insert the otherendofthe power cable into a grounded outlet

on

the wall, a power strip, or a grounded extension cord.

~

Warning

Do not use a 3-to-2-pronged adapter at the outlet; useofthis
type

of

adapter may result in electrical shock and/or damage to

the Hub.....

8 Repeat Steps 1 through 8 for each Hub to

be mounted (Steps 6

through 8 for freestanding Hubs).
Once the Hubs are properly placed in the room

or

wiring closet,

you should perform the power-up LED test in the next section.

40 Hub Placement

Power-Up LED Test

Once the

Hub

is mounted, you should verify that its

LEDs

are

functioning properly

by

using the procedureinthis section. Figure

15 illustrates

all

of

the

LEDs

on the Hub.

FIGURE

15

Hub

LEOs

)

-

._1

'I

"".

..

.!.L

..

- .

..

·

..

·

..

·

..

·

-

..

-.

..

-.

..

- .

..

-,

..

-,

"~

-

~

.

l,

•

"

-

~

[

Traffic

LEO

Collision

LEO

link/Jab

LEOs

AUI

Jab

LEO

Hub Placement

41

Procedure

To

verify that

the

Hub's

LEDs are functioning properly, follow

these steps:
1 Remove the powercable from the Hub.

2 Plug the powercable back into the Hub and observe the LED

activity on the Hub:

a

For

approximately two seconds after power is initially

applied, the following LED activity should occur.

LED

LED

Slale

Traffic

OFF

Collision

ON

Link/Jab

ON

RED

AUIJab

ON

b After two seconds,

the

LEDs should return to their normal

states.

LED

LED

Slale

Traffic ON
Collision OFF
Link/Jab OFF

(ON AMBER

if

Link

Integrity is disabled)

AUIJab

OFF

~

Note

If

you are running this test with any

of

the twisted-pair wire

jacks connected, the status

of

the Link/Jab LED may vary.
Therefore, it is recommended that you disconnect all jacks
before performing the power-up LED

test

....

42 Hub Placemenl

)

)

If

all LEOs followed the described sequence, then the Hub's

LEOs are operating properly.

If

there is a deviation from
the described sequence, proceed as follows depending on
the deviation:

•

If

all LEOs remained OFF, determine whether the power

source is functioning by plugging another device into

the receptacle. Then do

one

of

the following:

If

the receptacle is not providing power, plug the

Hub

into another receptacle known to have power.

If

the receptacle is providing power and allofthe

Hub's

LEOs remain OFF, check the connection
between the Hub and the powerreceptacle by
following these steps:

a Unplug the Hub from the receptacle.
b Oisconnect the female connector on the power

cable from the IEC Power Connector on the front
of

the Hub.

eRe-insert

the female connector into the IEC

Power

Connector.

d Plug the Hub into the receptacle.

If

all

of

the LEOs remain OFF. either the Hub

or
the power cable is not operating properly.
Contact a representative at the original place

of

purchaseora Service Technician.

Hub Placement

43

•

If

there are any otherdeviations from the power-up

sequence in Step 2b. return the Hub

to

the original

place

of

purchase.

If

you purchased your Hub from

AT&T:

In the United States and Puerto Rico. call the
toll-free

AT&T

National System Support Center

hotline

at

1-800-922-0354.

In Canada, call the toll-free AT&T Canada, Inc.
hotline

at

1-800-387-0913.

In all other countries, call your authorized AT&T
dealer.

Now

that

you've

completed the power-up test successfully,

proceed

to the next section,

"How

to Label

Hubs."

44

Hub Placement

•

)

)

How to Label Hubs

You should label all Hubsina StarLAN 10 Network to simplify the
tasks

of

administration and troubleshooting.

The Hub

to which all other Hubs in a room

or

wiring closet are

connectediscalled a primary Hub. All Hubs connected to a

primary Hub within the same room

or

wiring closet are called

secondary Hubs.

~

Note

The StarLAN 10 Network Hub Unit Design Form, included in the

"Before You Install a

Hub"

sectionofthis guide, should be

maintained to identify the destinationofeach connection to the

Hub.....

To label oneormore Hubs in a roomora wiring closet, follow
these steps:

1 Label the primary Hub (to which all other Hubs in the room

or

wiring closet will be connected) as

"Hub

I."

2 Label all secondary Hubs in the room

or

wiring closet as

"Hub

2"

with extensions in sequential order. For example, the first

secondary Hub should be labeled

"Hub

2-1

" the second

secondary Hub should be labeled

"Hub

2-2,"

etc., as shown in

Figure 16.

Hub Placement

45

FIGURE

16

labeling Hubs

Hub

1

'i

•

•

•

•

•

•

•

•

0

~

"-

Hub

2-1

Hub

2-2

Hub

2-3

! ""'r

"!'"

~

""'i

•

• •

•

• •

•

•

• •

..

• •

..

..

•

..

.. ..

..

•

•

..

..

•

..

•

•

0 0

0

~

~

~

"-

46

Hub Placement

PRIMARY
HUB

SECONOARY
HUBS

)

Making Connections to a Hub

Each

Hub

has

II

modular (RJ45) jacks and one AUt port. The

jacks

labeled'

'2"

through'

'II

" are permanently configuredasIN

jacks, and the jack

labeled''I"

is

a switchable IN/OUT jack.

This section describes how to make connections to a Hub in a room
or

a wiring closet to form a StarLAN 10 Network. Before making

any connections to a Hub

or

any other StarLAN 10 Network

device, you should read the "General Connection

Rules"

section

that follows.
Once you have completed making connections

to

the Hub, test the
network traffic movement through the Hub by following the
procedure in "Verifying Connections to the

Hub"

later in this

guide.

General Connection Rules

The following connection rules apply to all StarLAN 10 Network
configurations:

• When you connect a transceiver (AUI) cable to a

Hub's

AUI

port, you must connect the DCE D-type male connector

of

the

transceiver cable to the DTE D-type female connector

on

the

Hub.

• When connecting two devices together using twisted-pair wire,

you must connect the OUT

jackofone device to the IN jack

of

the otherdevice.
Certain StarLAN 10 Network hardware devices (such as the

Hub, the Coax Adapter, the Fiber Hub, and the Fiber Adapter)
have switchable IN/OUT jacks. When connecting a modular
cord to an IN/OUTjack, you must check the position

of

the

IN/OUT switch to verify that the IN to OUT connection rule

is

obeyed.

Making Connections to a Hub

47

To set the IN/OUT switch on a mounted Hub to the OUT

position, push the switch up, as shown in Figure IS.

FIGURE

17 setting

the

IN/OUT Switch

on

a

Hub

"",,""'

~=~

~

T

..

..

• The

Link

Integrity option switches are set to enable by default,
as shown in Figure 18. When connecting using twisted-pair
wire, you must make sure that the

Hub's

Link Integrity function

is set appropriately.
Certain devices do not support

Link Integrity.

If

you connect

the Hub to a device that does not support

Link Integrity, you

must make sure that the

Link Integrity function

is

disabled for

that

jack

on

the Hub.

If

you connect the Hub to a device that

supports

Link

Integrity, and the device has the

Link

Integrity

function enabled, you must make sure that the function is

enabled for that

jack

on the Hub.

48 Making Connections to a Hub

•

I

)

FIGURE

18

Link IntegrityOption Switch

Enabled

link

Integrity

Option

Switch

)

If

the Link/Iab LED is ON GREEN, the receive portionofthe

link between the Hub and the connected device

is

good.

If

it is

OFF, there is a problem with the connection.

Making Connections to a Hub 49

• When you are connecting more than two Hubs in the same

room, select a Hub to serve as

the

primary Hub for this room

(the Hub to which

all other Hubs in the room will be

connected), as shown in Figure 19. This will minimize the
number

of

Hubs in

anyone

path (end-to-end connection) on the

networlc.

RGURE

19

Connecting More Than Two Hubs In a Room

•

/

"

~.,

SECONOARY

HUBS

PRIMARY

HUB

]]-IN

Jacks

~

~

..

..

..

..

..

..

..

..

D

~

'--

~

~

~

I !

/f1

A1

Ai

UT

:

OUT

:

OUT

:

ack

..

Jack

..

Jack

..

..

..

..

..

..

..

..

..

..

..

..

..

D

D

D

~

~

~

~

~

o

J

)

50

Making Connections to a Hub

)

Connections to a Hub

in

a Room

A Hub installed in a room can support connections to the
following:

• StarLAN 10

Network nodes located in the room (using modular

cords)

• an Ethernet transceiver in the room (using transceiver cable)

• other Hubs in that room (using modular cords)

• a Hub in a wiring closet (using modular cords)
The procedures in this section describe connections between a Hub

in a room and a StarLAN 10

Network node, an Ethernet

transceiver, and another Hub located in the same room.

For

information

on

connecting a Hub in a room to a Hub in a wiring

closet, see "Hub-to-Hub Connection (Wiring

OosettoRoom)"

later in this section.

Making Connections to a Hub

51

Node-to-Hub Connection (Room)

To

connectaStarLAN

10

Network

node to a

Hub

in a room, follow

these steps:

1 Select the appropriate length

DW8A-DE

modular cord for the

connection.

2 Connect

one

endofthe modular cord to the

OUT

jack

on

the

hardware device

(for

example, a

PC

NAU)

you are connecting

to the

Hub

as

showninFigure 20.

3 Route

the

free

endofthe

modular

cord to the area

where

the

Hub

is located.

4 Connect the free end

of

the

modular

cord to

an

IN

jack

on

the

Hub.

~

Note

If possible, reserve the switchabIe

IN/OUT

jack

on

the

Hub

for

a connection to another Hub.

....

5

Make

sure

that

the

Link

Integrity setting for the modular

jack

on

the

Hub

agrees with thatofthe node.

52 Making Connections to a Hub

)

•

•

FIGURE 20 Node-Io-Hub Connection (Room)

OUT

Jack

~

--

"'-....

..

..

II

..

..

rn

..

C)

..

..

=

..

==

..

..

O·

~

I

OWBA-OE

~~''''''

Ethernet Transceiver-to-Hub Connection (Room)

To connect an Ethernet transceivertoa Hub in a room, follow these

steps:

1 Select the appropriate length transceiver (AUI) cable for the

connection.

2 Be sure the SQE (Signal Quality Error) test function on the

transceiver is

disabled. Forinformation on how

to

disable the

SQE test function, see the transceiver documentation.

~

Note

If

you enable the SQE test function, a high numberofcollisions

will occur

....

Making Connectionstoa Hub 53

3 Connect the female endofthe transceiver cable to

the

port on

the Ethemettransceiver

as

shown in Figure

21.

4 Route the free endofthe transceiver cable to the area where the

Hub is located.

5 Connect the male end

of

the transceiver cabletothe A

VI

port

on the Hub.

FIGURE

21

Ethernet Transcelver-to-Hub Connection (Room)

c:

::J.

""

Ethernet

-

Transceiver

i

: Coaxial

• Transceiver

Cable

:

Cable

•

•

•

..

~H+----

~~

'-_.JI-J

II!

AUIPort

54

Making Connectionstoa Hub

•

)

Hub-to-Hub Connection (Room)

To connect one Hub (Hub A) to a second Hub (Hub B) in the same

room, follow these steps:
1 Set the IN/OUT switch on Hub B to the OUT position

as

shown

in

Figure 17.

2 Make sure that the Link Integrity settings for the modularjacks

on both Hubs agree.

3 Select the appropriate length

of

modularcord (DW8A-DE or

D8W) for the Hub-to-Hub connection.

4 Connect one end

of

the modular cordtothe IN/OUT

jack

of

Hub B as shown in Figure 22.

5 Route the free end

of

the modular cordtothe area where Hub A

is located.

6 Connect the free end

of

the modular cordtoan

IN

jack

on

HubA.

~

Note

Remember, when connecting two or more Hubs in the same room,

it is important to minimize the number

of

Hubs in

anyone

path
(end-to-end connection) on the network. For information on how
you might minimize the number

of

Hubs in a path, read the

"General Connection Rules" section earlier in this guide

.....

Making Connections to a Hub 55

FIGURE

22

Hub-la-Hub Connection (Room)

Hub

A

TIl

"--H,,I-INJack

•

•

•

•

:

PRIMARY

•

HUB

•

•

D

~L

Hub

B

~=-

~ll

'-+-<"1-

OUT

Jack

•

•

•

•

•

:

SECONDARY

•

HUB

•

•

D

~

56 Making Connections to a Hub

)

)

Connections to a Hub

in

a Wiring Closet

A Hub installed in a wiring closet can support connections to the
following:

• wall jacks in rooms (using building twisted-pair wire)

• a Hub located in a room (using building twisted-pair wire)

• an Ethernet transceiver (using transceiver cable)

• Hubs installed in the same wiring closet (using modular cords)

• a Hub located in another wiring closet (using building twisted­pair wire

or

optical fiber)

• a Hub located in a wiring closet in another building (using
optical fiber)

This section contains the procedures for connecting a Hub in a
wiring closet to a room wall

jack

and to a Hub in a room.

The procedures for connecting devices (an Ethernet transceiver

or
multiple Hubs) to a Hub within that wiring closet are the same as
for connecting them in a room. The following sections contain
information on connecting devices:

•

For

information on connecting an Ethernet transceiver to a Hub
in a wiring closet, read the "EthernetTransceiver-to-Hub
Connection (Room)" section earlier in this guide.

•

For

information on connecting a Hub to another Hub in the
same wiring closet, read the "Hub-to-Hub Connection (Room)"
section earlier in this guide.

Instructions for making Hub-to-Hub connections between wiring
closets will be provided later in this guide.

~

Note

If

you are not familiar with wiring closet connectionsordo not feel

comfortable attempting such connections, it

is

recommended that

you retain the services

of

an AT&T technicianorother similarly

qualified professional.

For

installation service information,

read the

"To

Contact AT&T" section in the beginningofthis

guide

.....

Making Connections to a Hub 57

Before making anyofthese wiring closet connections, you must

know what type

of

wiring closet hardware and associated wiring is

being used in the building. To determine what type

of

wiring is in
the building, read the next section, "Identifying the Building's
Wiring Environment."

After you have determined the type

of

wiring environment the )

building has, turn to the appropriate procedure to connect each

Hub

you are installing.

Identifying the BUilding's Wiring Environment

Each StarLAN 10 Network hardware device you connect using the
building twisted-pair wire requires two pairs

of

wires: one pair to

transmit network signals and one pair to receive network signals.

In

a 4-pair cableora 25-pair cable with 4-pair groups, pairs 2 and 3

are used.

Your wiring closet will contain one

of

the two possible types

of
cross connects: llO-type cross connectsor66-type cross connects
(shown in Figure 23).

)

)

58

Making Connections to a Hub

•

FIGURE

23

IdentifyIng Cross COnnects

110-type

66-type

If

your wiring closet is equipped with I IO-type cross connects, it

is

called a "Premises Distribution System" (PDS).
If

your wiring closet is equipped with 66-type cross connects, it

is
either a tip/ring wiring environmentora lA-Key wiring
environment, depending on the type

of

telephone equipment in

your building.
If

your building is a tip/ring wiring environment, you can identify
the unused pairs (the twisted-pair used to complete the connection
between the Hub and a wall

jackoranother cross connect) on the

66-type cross connect by the color codes in Table

3.

Making Connections to a Hub 59

TABLE3Color

and

Function

of

PairsIna 25-Palr

Cable

(Tip/Ring

Environment)

DW8A·SE

Cord 25-Palr Station Cable

Color Group

Color Function'

)

! W-BL

Tip

BL-W

Ring

WoO

WOO

OD!

O-W

O-W

002

W-G W-G

ID!

G-W

G-W

ID2

W-BR

Power

BR-W

Power

2 W-S

Tip

SoW

Ring

WoO

R-BL

OD!

O-W

BL-R

002

W-G R-O

ID!

G-W

O-R

ID2

R-G

Power

G-R

Power

)

3

R-BR

Tip

BR-R

Ring

WoO

R-S

OD!

O-W

S-R

002

W-G

BK-BL

ID!

G-W

BL-BK

ID2

BK-O Power

O-BK Power

•

00

stands for

Out

Data.

001

and

002

are the transmit pair. ID stands for In )

Data.

lOt

and

ID2

are the receive pair.

60

Making

Connectionstoa

Hub

TABLE3Color

and FunctionofPairs In a 25-Palr Cable

(Tip/Ring Environment) (continued)

DW8A·SE

Cord

25·Palr

Station

Cable

Color Group Color

Function·

4

BK-G

Tip

G-BK

Ring

WoO

BK-BR

OD!

O-W

BR-BK

OD2

W-G

BK-S 101

G-W

S-BK 102
Y-BL

Power

BL-Y

Power

5 Y-O

Tip

O-Y

Ring

WoO

Y-G

OD!

O-W

G-Y

002

W-G

Y-BR

101

G-W

BR-Y

102

Y-S

Power

Soy

Power

6

V-BL

Tip

BL-V

Ring

WoO

V-O

OD!

O-W

O-V

002

W-G

V-G 101

G-W

G-V

102

V-BR Power

BR-V

Power

V-S

Spare

S-V

Spare

•

00

stands for Out Data.

001

and

002

are the transmit pair. ID stands for

In

Data.

IDl

and

102

are

the

receive

pair.

Making

Connectionstoa

Hub

61

If

your building is a lA-Key wiring envirorunent, you can identify
the unused pairs (the twisted-pair used to complete the connection
between the Hub and a wall jack

or

another cross connect)

on

the

66-type cross connect by the color codes

in Table 4.

~

Note

Pairs 23, 24, and 25 are usedinconjunction with a 149B Adapter; )

all other types

of

connections (that is, PC/lA-Key Adapter and

Armiger Adapter) use pairs 16, 17,21 and 22

....

TABLE4Color

and

FunctionofPairsIna 25-Palr

cable

(1

A-Key Environment)

DW8A-SE

Cord 25-Palr Station Cable

Color Pair

Color Function·

WoO

23,24

V-G OD!

O-W G-V

OD2

W-G

V-BR

101

G-W

BR-V

102

WoO

24,25

V-BR

OD!

O-W

BR-V OD2
W-G V-S 101
G-W

S-V

102

WoO

23,25

V-G OD!
O-W

G-V OD2

W-G

V-S

101

G-W

S-V

102

WoO

16,17

Y-BL

OD1

O-W

BL-Y

OD2
W-G Y-O 101
G-W

O-Y

102

WoO

21,22

V-BL

OD!
O-W

BL-V

002

W-G V-O 101
G-W

O-V

102

•

00

stands for Out

Data

001

and OD2 are the ttansmit pair. ID stands

for

In

)

Data.

IOl

and ID2 are the receive pair.

62

Making

Connectionstoa

Hub

Hub-to-Wall Jack Connection (Wiring Closet)

You can connect a Hub in a 66-typeorItO-type wiring closet to

room wall jacks.
To

connect a modular wall

jack

in a room to a Hub in a wiring
closet, you must connect the appropriate cross connects in the
closet to one

of

the Hub's IN jacks:

•

If

this closet contains ItO-type wiring, use a DW8A-DE

modular cord to connect the IN

jackofthe Hub to a 356A

Adapter that, in tum, is connected to the appropriate pairs

of

wires on the wiring block in the purple field.
Then

connect the same wire pairs on the purple field to the wire

pairs

on

the blue field that lead to the room's wall jack with

either a 2-pair

or

3-pairpatch cord (see Figure 24).

FIGURE

24

Hub

to

11o-type

Cross

Connect

IN

Jack

•

•

DW8A·DE

•

3S6A

2S·palr

• /

Adapter

Station

•

•

Cable

•

/

•

•

•

•

0

~

Purple

Field

4-pair

Cord

or

2S-pair

Station

Cable

~I

__

To

Room's

•

Wall

Jack

Blue

Field

Making Connections to a Hub

63

•

If

this closet contains 66-type wiring, use a DW8A-SE modular

cord to connect the

IN

jackofthe Hub to the appropriate wire
pairs on the cross connect leading to the room's wall jack (see
Figure

25).

To

connect the DW8A-SE modular cord to the wire pairs

on

the

cross connect, you punch down the appropriate leads

of

the )
DW8A-SE cord to the selected pairs on the cross-connect
block.

To

determine which unused pairs

are

appropriate for use

in your wiring environment, see Table

3

or

Table

4.

FIGURE

25

Hub to 66-type Cross

Connect

To

Room's

Wali

Jack

I

25-pair/
Station

Cable

)

64 Making Connections to a Hub

Hub-to-Hub Connection (Wiring Closet to
Room)

To connect a Hub in a wiring closet to a Hub in a room, you must
first connect the Hub in the wiring closet to a wall jack in the room
as described in the previous section.

After you have made that connection, connect the Hub in the room

to the wall

jack

using modular cord, as described in the following

steps:
1 Set the IN/OUT switch on the Hub in the room

to the OUT

position,

as

shown in Figure

17.

2 Make sure that the Link Integrity settings for the modularjacks

on both Hubs agree.

3 Select the appropriate length DW8A-DE modular cord

to

connect the Hub to the wall jack.

4 Connect one end

of

the modular cordtothe IN/OUT

jackofthe

Hub.

S Route the free end

of

the modular cord to the wall jack.

6 Connect the free end

of

the modular cordtothe wall jack.

Making Connections to a Hub 65

Hub-to-Hub Connection Between
Wiring Closets

The two procedures in this section describe how to connect Hubs in

wiring closets using twisted-pair wire and optical fiber,
respectively.

Each procedure assumes that a twisted-pair wire

or

optical fiber
path already exists between the two target wiring closets. You can
take advantage

of

this existing path to connect a Hub in one closet

to a Hub in a second closet.

Closet-to-Closet Hub Connection Using

Twisted-Pair Wire

To

connect a Hub in wiring closet Atoa Hub in wiring closet B

using existing twisted-pair wire, follow these steps:
1 Connect one

of

the Hub's INjacks in wiring closet Atothe

appropriate cross connects for your wiring environment.

•

If

this closet contains IIG-type wiring, use a DW8A-DE

modular cord

to connect the IN jack

of

the Hub to a 356A

Adapter that, in tum, is connected to the appropriate pairs

of

wires

on

the wiring block in the purple field.

66

Making Connectionstoa Hub

)

•

Thenconnect the same wire pairs on the purple field to the

wire pairs on the gray/white field leading to wiring closet B
with either a 2-pair

or

3-pair patch cord (see Figure 26).

FIGURE

26

Hubto11D-type

Cross

Connect

IN

Jack

,

•

DWBA-DE

•

•

25-pair

•

•

Station

•

Cable

•

•

~

•

•

a

~

To

Wiring

Block

B

GraylWhile

Field

Purple

Field

Making

Connections to a Hub

67

•

If

this closet contains 66-type wiring, use a DW8A-SE

modular cord to connect the

IN

jackofthe Hub to the

appropriate wire pairs

on

the cross connect that

are

connected to wiring closet B (see Figure 27).

To

connect the

DW8A-SE

modular cord to the wire pairs

on

the cross connect, you punch down the appropriate lcads

of

the

DW8A-SE

cord to the selected pairs

on

the cross-

connect block.

To

determine which unused pairs are

appropriate for

useinyour wiring environment, see

Table

3

or

Table 4.

FIGURE

27

Hub to 66-type

Cross

Connect

To

Wiring

Closet

8

I

25-pair~

Station

Cable

68 Making Connections to a Hub

DWBA-SE

r;;;""./

IN

Jack

\

~i

)

2 Set the IN/OUT switch on the Hub in wiring closet B to the

OUT

position, as shown in Figure 17.

3 Make sure that the Link Integrity settings for the modularjacks

on

both Hubs agree.

4 Connect the IN/OUT

jackofthe Hub in wiring closet B to

the

wire pairs on the cross connect that lead to the Hub in wiring
closet

A,

as shown in Figure 28 (for aIIOotype

wiring closet) or

Figure 29 (for a 66-type wiring closet).

FIGURE

28

110-type Cross Connect to Hub

OUT

Jack

~II

~

~

~

~
~

~

~

~

~
~

o

~

DW8A·DE

2S-pair

Station

Cable

--------~-

From

Wiring

Closet

A

GraylWhile

Fieid

Purple

Field

Making Connections to a Hub

69

FIGURE

29

66-type

Cross

ConnecttoHub

From

Wiring

Closet

A

I

25-pair/

Station

Cable

70 Making Connections to a Hub

DWBA-SE

\

)

•

D

~

_

...

0..."

(

)

o..I\9"Wh"

_.C:

..

n

1O,.

...WlIlIll

Closet-to-Closet Hub Connection Using
Optical Fiber

To

connect a Hub in

one

wiring closet to a Hub in anotherwiring

closet using optical fiber, you must use two StarLAN 10

Networlc

Fiber Adapters.

The

Fiber Adapter accepts a modularcord from

the

Hub

and two optical fiber connections (transmit and receive).

Both ends

of

the optical fiber have this same typeofconnection.

For

additional information about the Fiber Adapter, see the

StarLAN 10 Network Fiber Adapter Installation Guide.

To connect a Hubinwiring closet A to a Hub in wiring closet B
using optical fiber, follow these steps:

1

Set

the IN/OUT switch

on

the FiberAdapter in wiring closet A

to the

OUT

position.

2

Make

sure that the Link Integrity settingofthe Hubinwiring

closet A matches that

of

the Fiber Adapter.

Making Connections to a Hub

71

3 Connect an IN

jackofthe Hub in wiring closet A to the

IN/OUT jack

on

the Fiber Adapter using a modular cord with a

maximum length

of

15

meters,asshown in Figure 30.

FIGURE

30

COnnecting a

Hub

to a Fiber Adapter (Closet A)

Wiring

Closet

8

~~

~

..

..

..

..

..

..

tor

rt

?

..

..

..

/1e-

..

0

r

~

Fiber
XlLink

LEO

TX

onnecto

RX

Connec

Wiring

Closet

A

~

I R

..

OUT

FY1

..

..

JacZ

..

..

i'

..

..

\

~

..

..

~I

..

0

~

""'-

"""IN

C

8

Jack

4 Select two optical fibers that run from wiring closet A to wiring

closet B.

5 Connect one optical fiber

in

wiring closet A to the

Rx

(receive)

connectoron the Fiber Adapter in wiring closet A.

Then

connect the other optical fiber in wiring closet A to the

Tx

(transmit) connector

on

the Fiber Adapter in wiring closet

A.

(See Figure 31.)

6 Go to wiring closet B.

)

72 Making Connections to a Hub

7 Connect the optical fiber from the

Tx

(transmit) connector in

wiring closet A

to

the Rx (receive) connector

on

the

Fiber

Adapter in wiring closet B.

The

FiberRx/Link

LED

(green) on

the Fiber Adapter will

tum

ON

when the correct optical fiber is

connected.

If

the

Fiber

Rx/Link

LED

on

the Fiber Adapter does not light,
disconnect that fiber and connect the other optical fiber to the
Rx

(receive) connector.

If

the Fiber Rx/Link

LED

on

the Fiber Adapter still does not
light, refer to the

StarlAN

10 Network Fiber Adapter

1nslallatlon Guide

for troubleshooting procedures.

8

If

the Fiber Rx/Link

LED

lights, connect the remaining fiber to

the

Tx

(transmit) connector

on

the FiberAdapter.

9

Set

the IN/OUT switch

on

the Fiber Adapter in wiring closet B

to the IN position.

10

Set

the IN/OUT switch

on

the Hub in wiring closet B to the

OUT

position, as showninFigure

17.

11

Make

sure that the Link Integrity settingofthe Hubinwiring

closet B matches that

of

the Fiber Adapter.

Making Connections to a Hub 73

12 Connect the IN/OUT jackofthe Hub in wiring closet B to the

IN/OUT

jack

on

the Fiber Adapter in wiring closet B using a

modular cord.

13Ifdesired, enable the Link Integrity Pass Thru switch on both

FiberAdapters

in

rooms A and B. The Pass Thru function

sends link failure indications received at a Fiber Adapter
through to a Hub. Thus, the Link/Jab LED on the Hub

in

closet

B can indicate link failures on the modular cord connection

in
closet B, the optical fiber connection between closets,orthe
modular cord connection in closet

A.

The Pass Thru function

is
only supported on Fiber Adapters that have Wire Link Integrity
enabled.

For

more information, see the Fiber Adapter

Installation Guide.

When you have properly connected the Hubs and Fiber
Adapters, the Hub-to-Hub connection using modular cord and
optical fiber will look like Figure 31.

FIGURE

31

Closet-to-Closet

Connection

Using Optical Fiber

Wiring

Closet

A

Wiring

Closet

B

OUT

~

Jack_

~

..

F=

.-

..

\

..

..

..

.. ..

..

..

..

..

..

\

I"--IN

..

..

~

..

..

Jack

..

..

..

..

0

'-

'-

0

~

~

74 Making Connections to a Hub

)

Hub-to-Hub Connection Between Buildings

The StarLAN 10 Network allows you to share infonnation between
buildings.

To

do this, you connect a Hub in a wiring closet

(typically the closet in the basement, called the

"equipment

room

")

in one building to a Hub located in a wiring closetofanother

building using Fiber Adapters and optical fiber as the medium.

The optical fibers used

to connect Fiber Adapters can be up to 6560

feet (2 kilometers) long. The use

of

optical fiber as a connection

medium between Hubs allows you to create a single StarLAN

10

Network that services users in multiple buildings. When designing

a multiple-building StarLAN 10 Network, you must adhere to delay
and distance guidelines.

Each connection to optical fiber requires a StarLAN 10 Network
Fiber Adapter.

The

Fiber Adapter accepts a

modul¥

cord from the

Hub and two optical fiber connections (transmit and receive)

from

the optical fiber cross connect Both closets must have this type

of

connection.
For

additional infonnation on the Fiber Adapter, see the StarLAN

10 Network Fiber Adapter1nstallation Guide.

To connect a

Hub

in building A to a Hub in building B, follow the

procedure "Closet-to-Closet Hub Connection Using Optical Fiber"

earlier in this guide.

Making Connections to a Hub

75

Verifying Connections
to the Hub

After you have completed making properconnections to the Hub's
A

U1

port and the modular jacks, you should verify that these

connections are good by performing the procedure in this section:

~

Note

Before performing this procedure, make the proper connections to
the Hub's AUI port and its modularjacks. Verify that the
connected devices are powered on and that

Link Integrity is

configured properly

on

the Hub and the connected twisted-pair

devices

....

Procedure

To

verify connections to the Hub, follow these steps:
1 Plug in the Hub and turn on the devices connected to it.
2 Load the network software on

aU

of

the computers connected

to

the Hub.

3 After the network software has been loaded, verify connectivity

through the Hub by attempting to establish communications
between any two computers connected to it:

•

If

you are using AT&T

StarGROlJPTM

software, you can run

the NETSTAT Program to test connectivity.

For

information

on

running the NETSTAT Program, see the

guides packaged with the StarGROUP software.

•

lfyou

are not using AT&T StarGROUP software, see the

documentation supplied with your software for a method

of

checking network connectivity.

Ver~ying

Connections to the Hub 77

4 Ifthe connectivity test perfonned in Step 3 is not successful,

verify the relationship between the Hub's AU! port/modular

jacks and the connected devices. Verify that the OUT to

IN
connection rule is obeyed (for more infonnation, see the section
entitled''General Connection Rules" earlier in this guide).

If

the relationship is correct, the Hubisprobably not the source

of

the problem. Contact your system administrator for further

assistance.

78 Making Connections to a Hub

)

)

Interpreting Hub LEOs

Your Hub has LEOs which verify connections to twisted-pair wire
devices (linkIjab LEOs) and indicate the presenceofthe following:

• network traffic (traffic LEO).

• network collisions (collision LEO).

• collision stonns (link/jab LEOs).

• continuous

transmissions-also

knownasjabber (link/jab

LEOs).

You can use these LEOs to isolate defective building wiring.
modular cords. cord connections. power transfonners. and nodes.

Of

the

14

LEOs shown in Figure 32. two LEOs (traffic and

collision) indicate activity related

to the Hub (not specific to any

one connection). Included in the remaining

12

LEOs are the AUI

jab

LEO and the link/jab LEOs. The AU!

jab

LEO is associated

with the AUI port. and the

II

link/jab LEOs are associated with

eachofthe

II

modularjacks (one LEO perjack/port).

Interpreting Hub

LEOs

79

FIGURE

32

Hub

LEOs

~

_1

II

'11'1

..

f--

I!!-

..

f-

•

..

f- •

..

f-

•

..

f- •

..

f-.

I--

..

f--

..

f- •

..

f- •

..

H

..

f-'

J,~

f-

0

"

-.

•

<

~

~

Traffic

LED

Collision

LED

Link/Jab

LEOs

AUI

Jab

LED

)

80 Interpreting Hub

LEOs

To

better understand how traffic and collision LEDs reflect
network activity, it is important for you to know how network
signals travel through Hubs. A network signal enters the Hub
through any port and is transmitted out through

all other Hub ports

(see Figure 33).

FIGURE

33

Traffic Traveling Through Hubs

To

a

connected

device

......

>---~

• I D

.. I D

..

I

[)

.. I

[)

..

I

()

.. I D

..

I

[}

..

I D

• I

Co

--.

-----i-O

~

•

Network

signals

initiated

from

this

node

The following sections describe the functions

of

the

Hub's

LEDs

and explain how to interpret their various states.

Interpreting Hub

LEOs

81

Traffic LED

The green

LED

located

on

the top rightofthe Hub (see Figure 34)

indicates network traffic.
Under normal operating conditions. the traffic LED

is

ON when

there is no traffic (and power is being supplied to the Hub) and )

blinks

OFF to indicate the presence

of

traffic from a connected

node

or

another Hub.

The traffic

LED

is useful as a troubleshooting aid, as indicated in

the next section, •'Traffic LED Indications

.••

FIGURE

34

Traffic

LED

Traffic

LED

~y

~

~

..

..

82

Interpreting Hub LEDs

)

)

Traffic LED Indications

Table 5 lists the possible statesofthe traffic LED. Match the

activity

of

the traffic LED on the Hub with one

of

the states

indicated in the table.

TABLE

5 Traffic LED

State

Indication Interpretation

Blink

Normal Traffic received from any

device connected to

the

Hub

On Normal

No traffic, power on

Off

Problem No power. (See

"Note")

~

Note

If

the traffic

LED

is off, return the Hub to the original place

of

purchase.

if

you purchased the Hub from AT&T in the United

States

or

Puerto Rico, call the toll-free AT&T National System

Support Center hotline at I-800-922-0354.

In

Canada, call the

toll-free AT&T Canada. Inc. hotline at 1-800-387-0913.

In

all

othercountries, call your authorized AT&T dealer.

...

Interpreting

Hub

LEOs

83

Collision LED

The

amber

LED

located

on

the top rightofthe Hub (see Figure 35)

indicates collisions. This

LED

normally is OFF and blinks

ON

to

indicate the presence

of

collisions.

A collision occurs when two nodes anempt to transmit

on

the

network at the same time. When a collision occurs, both nodes

recognize the collision, stop transmitting, wait a random amount

of

time, and attempt to

retransmit

Collisions are normal occurrences

on

CSMA/CD networks; the more heavily used a StarLAN 10

Network is, the more often collisions will occur.

FIGURE

35

Collision

LED

g

..

..

Collision

LED

~

(

)

84 Interpreting Hub LEOs

)

)

As the frequency

of

collisions on a networlc increases. the activity

(on-time)

of

the LED also increases.

If

the collision LED becomes

very active. you may want to make use

of

other networlc

troubleshooting tools. such

as

the

AT&T StaR3ROup™ Software
Networlc Managerorthe NETSTAT command, to determine
whether the

networlc has reached capacity and may need to be

separated into two

networlcs connected by a bridge.

While the collision LED blinks to indicate normal

networlc
collisions. it also may be useful in troubleshooting certain problems
related to

networlc wiring.

If

the collision LED blinks when only
one node connected to the Hub is active. there may be a wiring
problem associated with that jack

or

port.

Typical wiring problems indicated by excessive activity

of

the

collision LED include the following:

• a defective twisted-pair wire connected to a Hubjack

or

cross

connect

• a defective connector

• a poor grade

or

wrong typeofcable

• a twisted-pair wire that exceeds recommended length

• a twisted-pair wire that passes through

or

is bundled with an

excessive source

of

high intensity noise

• a bridged tap

• a Medium Attachment Unit (MAU) connected to the AUI port
without the SQE test function disabled

If

noneofthese problems exist, the problem may be related to that

jackorport

on

the Hub.

Interpreting Hub LEDs

85

AUI Jab LED

The

red

LED

located

near

the AU! port

on

the Hub (see Figure 36)

indicates a

jab

condition.

The

AU! Jab

LEDisOFF

under normal

operating conditions and

ON

to indicate that

ajab

condition exists

at

the AU! port.

FIGURE

36

AUI Jab LED

-

T

B

..

--

..

-0

..

_0

..

--

..

-0

..

-0

..

-"

..

_0

..

0

..

•

..

"

~

,

n

..

~

J

'-

~

AUI

ab

LED

86 Interpreting Hub

LEOs

)

)

)

A

jab

condition exists when eitherofthe following events is

detected at the AUI port:

•

The

transmissionofnetwork signals exceeds the maximum

allowable transmission time.

• Successive collisions are detected on a given connector (A

UI

port) without an intervening successful transmission

or

reception.

A

jab

condition may be caused by a faulty nodeorwiring

connection. A typical faulty wiring condition would

be a missing

terminator

on

the coax segment attached to the AUI port.

When a jab condition is detected at the AUI port, the Hub
automatically deactivates the AUI port's ability to receive

incoming data. The

jab

condition is indicated at the AUI port by

the

ON

stateofthe AUI

jab

LED. The hardware device (and

consequently all devices connected to that hardware device)

associated with the AUI port is temporarily disconnected from the

network. The modular jacks and their associated devices are

undisturbed and continue functioning nOlmally.

When the cause

of

the

jab

condition has been corrected and a

normal data packet

is

transmitted to

or

received from that AUI port
without a collision, the AUI port is automatically reactivated and
the LED is turned OFF.

Interpreting Hub

LEOs

87

Link/Jab LEOs

Link/Jab LEDs are multicolored (red, green, amber). A Link/Jab
LED is located near each modular jack on the Hub (see Figure

37).

The Link/Jab LED indicates the presenceofjab at the Hub's

modularjacks (this function overrides the Link/Jab LED's Link
Integrity indications). In the absence

of

jab, the Link/Jab LED

indicates whether the Link Integrity is enabled. When Link

Integrity is enabled, the Link/Jab LED verifies the integrity

of

the

receive portion

of

the twisted-pair wire connection.

FIGURE 37 Link/Jab LEOs

11-

T

..

--

--

..

--

..

--

..

--

..

--

..

--

..

--

f---

Link/Jab

LEOs

..

--

..

-

..

-,

..

-,

...,---

88

Interpreting

Hub

LEOs

)

)

Undernonnal operating conditions, the Link/Jab LED will remain

either

ON

GREEN (ifLink Integrity is enabled and the link is

good)

or

ON

AMBER

(if

Link Integrityisdisabled). The Link/Jab

LED is

OFF

when its corresponding

jack:isnot in use.

Use Table 6 to interpret the status

of

a Link/Jab LED that is

connected

to a device. Complete descriptions

of

jab

and Link

) Integrity states appear following the table.

TABLE 6 States

of

the

link/Jab

LED

at Connected Jacks

LED

State Description

ON

RED A jab condition exists at the modularjack:. This

function overrides the Link/Jab LEOs Link
Integrity Indications.

ON

GREEN

Link:

Integrity is enabled and the receive portion

of

the link is good.

OFF Link Integrity is enabled and one

of

the

following conditions exist:

• a problem exists with the connection to the
twisted-pair wire device

•

if

the connected device is a Fiber Adapter
with Link Integrity Pass Thru enabled, a
problem may also exist in the connections
between the fiber side

of

the adapter and the

end device in the path.

• the connected device is powered OFF

• the Hub is not receiving power

• the LED is malfunctioning
To test the LED, disconnect the twisted-pair

wire

jacks and perfonn the procedure in the

the section entitled "Power-Up LED

Test"

earlierinthis guide.

)

ON

AMBER

Link Integrity is disabled.

Interpreting

Hub

LEOs

89

Jab Indications

The Link/Jab LED will remain ON RED when

ajab

condition

exists at a modular jack. A

jab

condition exists when eitherofthe

following events

is

detected at a modularjack:

• The number

of

successive collisions exceeds the maximum

allowable number

of

successive collisions.

• The duration

of

a collision exceeds the maximum allowable

duration for a collision.

A

jab

condition may be caused by a faulty nodeorwiring condition

(forexample, an electrical short in a piece

of

twisted-pair wire).

When

jab

is detected at oneofthe ports, the Hub automatically

deactivates this port. The twisted-pair wire device connected to the

port is disconnected temporarily from network. The remaining

devices connected to other ports

on

the Hub are undisturbed and

continue to function normally.
When the cause

of

the

jab

has been corrected and a normal data
packet is transmitted to the port, the port is automatically
reactivated and the Link/Jab LED returns to its previous state.
Communication is automatically re-established between the
twisted-pair wire device connected to the port and the rest

of

the

network.

90 Interpreting Hub LEOs

)

)

)

Link Integrity Indications

In the absenceofjab

and with Link Integrity enabled, the Link/Jab

LED can provide the following indications:

•

If

the LED remains ON GREEN, the receive portionofthe

twisted-pair wire connection is good. Check the LED

on

the

connected device

to verify the integrity

of

the transmit portion.

•

If

the LED remains OFF, either a problem with the twisted-pair

wire connection is indicated, or,

if

the Hub is connected to a

FiberAdapter with Link Integrity Pass

Thru enabled, a problem

may also exist in the connections between the fiber side

of

the

adapter and the end device in the path.
Verify that both the Hub and the connected device are powered

on and that the Link Integrity option switch has been set
correctly

on

both devices.

If

the connected device is a Fiber

Adapter, disable Pass

Thru on the Adapter and check the Hub

LED again.

If

the LED is now ON GREEN, the problem is on

the fiber side

of

the adapter.

If

the problem needs to be isolated further, check for an incomplete

or

incorrect twisted-pair wire connection between the devices (such

as a loose modular cord

or

an OUT-OUT connection).

If

necessary, use a continuity testerora time domain reflectometer
(TOR) to test the twisted-pair wire for breaks

or

shorts.

If

a valid

twisted-pair wire connection exists, one

of

the two devices may be

defective.
In the absence

of

jab and with Link Integrity disabled. the Link/Jab

LED should remain ON AMBER. This indicates that the Hub is

receiving power. Note that this does not necessarily indicate a

valid twisted-pair wire connection.

Interpreting Hub

LEOs

91

Hub Pin Assignments

The following illustrations indicate the pin assignments for

modularjacks and the AU!

port on the Hub. You may find this

information helpful in troubleshooting networks comprised

of
equipment that has pin assignments different from those used in
AT&T equipment.

FIGURE

38

RJ45

Connector

Pin

OUT Jack Assignments IN Jack Assignments

1 OUTGOING DATA 1 (+) INCOMING DATA 1 (+)

2 OUTGOING DATA 2 (-)

INCOMING DATA 2

(-)

3

INCOMING DATA 1 (+) OUTGOING DATA 1 (+)

4 (No Connection) (No Connection)

5

(No Connection) (No Connection)

6

INCOMING DATA 2 (-) OUTGOING DATA 2 (-)

)

7

(No Connection) (No Connection)

8 (No Connection) (No Connection)

Hub

Pin

Assignments

93

FIGURE

39

OTE O·type Connector

)

\0

0 0 0 0 0 0

~}

O

876543210

o 0 0 0 0 0 0

15 14 13 12

11

10

9

Pin

3

10

11

5

12

4

7

15

8

2

9

I

6

13

14

Shell

Circuit

DO-A
DO-B
DO-S
DI-A
DI-B
DI-S
CO-A
CO-B
CO-S
CI-A
CI-B
CI-S

V

c

VP
VS

PG

Use

Data Out Circuit A

Data Out Circuit

B

Data Out Circuit Shield

Data

In

Circuit A

DataInCircuit B

DataInCircuit Shield

Control Out Circuit

A

Control Out Circuit B
Control Out Circuit Shield

Control

In

Circuit A

ControlInCircuit B
ControlInCircuit Shield

Voltage Common"
Voltage Plus"

Voltage Shield
Protective Ground (Conductive Shell)

• Voltage

Common

and

Voltage

Plus

use a single

twisted-pairinthe

AUl cable. )

94

Interpreting Hub LEDs

Glossary

This section explains technical tenns for readers unfamiliar with
communications wiring environments and local area networks.

)

)

lA-Key

system

IOBASE2

IOBASES

IOBASE-T

66-type

wiring

environment

nO-type

wiring

environment

The AT&T wiring system for the 6-button

telephones called

"lA-Key

sets."

An

IEEE Standard 802.3 for local area
networks. Complying networks must be
capable

of

carrying infonnation at a rate

of

10
Mbitslsecond over distances up to 606 feet
(185 meters)

of

thin coaxial cable.

An

IEEE Standard 802.3 for local area
networks. Complying networks must be
capable

of

carrying infonnation at a rate

of

10

Mbitslsecond over distances up to 1640 feet

(500 meters)

of

thick coaxial cable.

A draft standard

of

the ANSI/lEEE Standard

802.3 for LANs compatible with Ethernet

networks on unshielded twisted-pair wire.
An

older AT&T wiring system. now
being replaced by the 110-type. in which a

special tool must be used

to attach to the

cross connect the twisted-pairs from
telephones. nodes. and othercommunications
devices.

Also called "Premises Distribution
System"

(PDS).The AT&T wiring system in
which the telephones. nodes, and other
communications devices can be easily added
and rearranged with modular wiring
components and patch cords.

Glossary

95

802.3

An

IEEE standard for local area networks
based on bus configuration and Carrier Sense
Multiple Access with Collision Detection

(CSMNCD)

(includes !BASE5. IOBASE2.

and IOBASE5).

adapter

A device that supports the interconnection

of

)

different sizesortypesofplugs.

Attachment

Unit

The interface between the Medium

Interface

(A

VI)

Attachment Unit and a node within a local
area network.

bridged

tap

A cable (or cord) connected to another cable
(orcord) at a point other than its end. Such a
tap causes impairment

of

network signal

transmissions.

coaxial

cable

A cable with at least one transmission line
consisting

oftwo

conductors. an inner
conductor and an outer conductor. insulated
from one another by a dielectric. Coaxial
cable carries higher frequencies than
twisted-pair cable and offers a broader
bandwidth.

It

is

commonly used to transmit

)

video signals. but can also be used for certain
high speed data applications.

collision A condition that occurs when two nodes

attempt to transmit on the network at the
same time. When a collision occurs. both
nodes recognize the collision. stop
transmission. wait for a random time interval.
and then attempt to retransmit.

collision

storm

An

excessive amountofconsecutive
collisions on a port indicating a potential
problem with the wiring connection

or

a

faulty node.

conductor

A medium suchascopper wire that can carry
electrical current.

)

configuration

The

layoutofnodes and components in the

network.

96 Glossary

cross

connect

A panel on which the leadsofstation cable

are mounted so that an AT&T technician,

other wiring craftsperson,

or

the system

administratorcan make electrical connections

between the communications devices wired
to the cables.

DCE

Data communication equipment.

DTE

Data terminal equipment.

equipment

room

An

enclosed space where voice and data
common equipment circuit administration is
performed.

Ethernet

A 10 Mbits/second Carrier Sense Multiple

Access with Collision Detection

(CSMNCD)

local area network on coaxial cable.

Ethernet

A device usedinan Ethernet local area

transceiver

network to couple data terminal equipment to
the transmission medium.

Fiber

Adapter

A hardware device used to convert StarLAN

10 Network signals between electrical signals

transmitted on twisted-pair wire medium and
light pulses transmitted on optical fiber
medium.

Hub

A device used to provide connectivity
between data terminal equipment

in

a

StarLAN

10

Network. Each Hub provides

connections for up to

12

hardware devices:

11

modularjacks (10 dedicated IN jacks and

1 switchable IN/OUT jack) and an

AUt

port.

jab

A condition where a port is disconnected
from the network

as

a resultofthe detection

of

jabberora collision storm on that port.

jabber

A condition where the transmission

of

network signals exceeds the maximum

)

allowable transmission time. Jabbermay be

caused by a faulty node

or

wiring connection.

LED

Light emitting diode.

Glossary

97

Link

Integrity

A generated signal that verifies

function

continuity between twisted-pair wire devices.

local

area

A data communications network consisting

network

(LAN)

of

host computersorother equipment

interconnected to terminal devices, such

as
personal computers, often via twisted-pair
wire

or

coaxial cable. Typically, the network

is limited

to a single premise.

Medium

A device used in a data station to couple

Attachment

the data terminal equipment to the

Unit

(MAU) transmission medium.

megabit

(Mbit)

One million

bilS.

modular

cord

A cord containing four twisted pairsofwires,
with a modular plug on one

or

both ends.

Network

Access A plug-in expansion board that enables

Unit

(NAU)

StarLAN 10 Network nodes to send and

receive data through the network.

node

A Network Access Unitoran AT&T
Information Systems

Network (ISN) StarLAN

Interface Module (SLIM).

)

optical fiber

A transmission medium consisting

of

a core

of

glass surrounded by strengthening material
and a protective jacket. Signals are
transmitted

as

light pulses and introduced

into the optical fiber by a laser

or

light

emitting diode.

plenum

cord

Communications cord with fire-retardant
insulation, generally used in suspended
ceilings and other places where air circulates
back to the building's air-conditioning system.

port

On a network device, an outlet where other

devices may be connected.

For

example, the

AU! port and modularjacks

on

the StarLAN

10

Network Hub.

primary

Hub

The

Hub to which all other Hubs in a room

or

)

wiring closet are connected.

If

a room

or

a

wiring closet has only one Hub, it also is

considered a primary Hub.

98

Glossary

wiring
environment

)

secondary

Hub

Any Hub whose OUTjack is connectedtoan
INjackofa primary Hub in the same room or
wiring closet.

tip/ring system The AT&T wiring environment that

designates

tip and ring as the functions

of

two

conductors within each wire group

of

a 25-

pairstation cable.

transceiver cable A cable used

to

connect two hardware
devices: one having aD-type DCE connector
and the other having aD-type DTE
connector. Also

called"

AU! cable."

twisted-pair wire Two insulated copper wires twisted together.

The twists are varied in length to reduce the

potential for signal interference between
pairs.

In

cables greater than 25 pairs, the

twisted-pairs are grouped and bound together

in

a common cable sheath. Twisted-pair
cable is the most common of transmission
media.

wall

jack

Also called "connecting block,"

"modular

wall outlet," or "information outlet.

"A

receptacle used with a modular plug to make
electrical contact between circuits and
communications devices. such

as

telephones

and nodes.

wiring block The part

of

the I!O-type cross connect that
terminates twisted pair wiring and can be
used with eitherjumper wires orpatch cords
to

establish circuit connections.

wiring closet A room, closet, or cabinet where station cable

is

terminated on cross connect blocks and
where the building communications system
can be administered.

Any building communications wiring
system. See also

nO-type

wiring
environment and 66-type wiring
environment.

Glossary

99