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
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Order: Document No. 999-100-722
UPDATES
AT&T can automatically provide you wijh updates to any StarLAN 10
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"you
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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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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-"
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-"
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f-"
r--
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f-"
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'-f-"
r-'
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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
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Room
•
...
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•
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I
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I
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26 Hub Configurations
FIGURE
8 Multiple Wiring Closet Configuration Using Optical
Fiber
Fiber
Adapter
•
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h
I
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~
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f-'
~
X
X
IX
Room
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Wiring
Closet
Room
Fiber
Adapter
•
h
I
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I I
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IX IX
Room
rl=t
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Wiring
Closet
Room
Networl<
Configurations 27
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