SMC Networks TigerStack 3312TA,TigerStack 3326TA,TigerStack 3314T,TigerStack 3328T,TigerStack 3306BC ,TigerStack 3306FC,TigerStack 3328TELCO User Manual

User Guide

Unmatched Bandwidth
Scalability for
Ethernet
Workgroups

TigerStack

SwitchReady

™

Multi-Segment Stackable Ethernet Hubs

USER GUIDE

FOR

SMC’S

TIGERSTACK

FAMILY OF ETHERNET HUBS

March 1997

Pub. # 900.166 Rev. A

Standard Microsystems Corporation

80 Arkay Drive

Hauppauge, New York 11788

Information furnished by Standard Microsystems Corporation
(SMC) is believed to be accurate and reliable. However, no
responsibility is assumed by SMC for its use, nor for any
infringements of patents or other rights of third parties which
may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of SMC. SMC
reserves the right to change specifications at any time without
notice.

Copyright © 1997 by

Standard Microsystems Corporation

Hauppauge, New York.

All rights reserved. Printed in U.S.A.

Trademarks:

SMC and Standard Microsystems are registered trademarks; and TigerStack, TigerHub and
EliteView are trademarks of Standard Microsystems Corporation. Other product and com­pany names are trademarks or registered trademarks of their respective holders.

Limited Warranty

HARDWARE: Standard Microsystems Corporation (“SMC”) warrants its hub

products to be free from defects in workmanship and materials, under normal
use and service, for the following length of time from the date of purchase
from SMC or its Authorized Reseller:

TigerStack Hubs (excluding Power Supply and Fan) . . .. . . .. . .Limited Lifetime

TigerStack Power Supply and Fan . . . . . . . . . . . . . . . . . . . . . . . . . .Five Years

If the product does not operate as warranted during the applicable warranty
period, SMC shall, at its option and expense, repair the defective product or
part, deliver to Customer an equivalent product or part to replace the defective
item, or refund to customer the purchase price paid for the defective product.
All products that are replaced will become the property of SMC. Replacement
products may be new or reconditioned. Any replaced or repaired product or
part has a ninety (90) day warranty or the remainder of the initial warranty
period, whichever is longer.

SMC shall not be responsible for any custom software or firmware, configura­tion information, or memory data of Customer contained in, stored on, or inte­grated with any products returned to SMC pursuant to any warranty.

LIMITED LIFETIME: TigerStack hubs have a standard three-year warranty. If
you wish to extend your three-year warranty on this unit to a lifetime warranty,
please complete and return the enclosed product registration card within 90
days of purchase from SMC or its Authorized Reseller. Failure to complete and
return this card does not affect the standard, three-year warranty. After registra­tion, any defective TigerStack hub will be repaired or replaced at SMC’s option.

SOFTWARE: SMC warrants that the software programs licensed from it will per­form in substantial conformance to the program specifications for a period of
ninety (90) days from the date of purchase from SMC or its Authorized Reseller.
SMC warrants the magnetic media containing software against failure during the
warranty period. No updates are provided. SMC’s sole obligation hereunder
shall be (at SMC’s discretion) to refund the purchase price paid by Customer for
any defective software products or to replace any defective media with soft­ware which substantially conforms to SMC’s applicable published specifications.
Customer assumes responsibility for the selection of the appropriate applica­tions program and associated reference materials. SMC makes no warranty that
its software products will work in combination with any hardware or applica­tions software products provided by third parties, that the operation of the
software products will be uninterrupted or error free, or that all defects in the
software products will be corrected. For any third party products listed in the
SMC software product documentation or specifications as being compatible,
SMC will make reasonable efforts to prove compatibility, except where the
non-compatibility is caused by a “bug” or defect in the third party’s product.

STANDARD WARRANTY SERVICE: Standard warranty service for hardware
products may be obtained by delivering the defective product, accompanied by
a copy of the dated proof of purchase, to SMC’s Service Center or to an
Authorized SMC Service Center during the applicable warranty period. Standard
warranty service for software products may be obtained by telephoning SMC’s
Service Center or an Authorized SMC Service Center, within the warranty
period. Products returned to SMC’s Service Center must be pre-authorized by
SMC with a Return Material Authorization (RMA) number marked on the out­side of the package, and sent prepaid, insured, and packaged appropriately for
safe shipment. The repaired or replaced item will be shipped to Customer, at
SMC’s expense, not later than thirty (30) days after receipt by SMC.

WARRANTIES EXCLUSIVE: IF AN SMC PRODUCT DOES NOT OPERATE AS
WARRANTED ABOVE, CUSTOMER’S SOLE REMEDY SHALL BE REPAIR,
REPLACEMENT OR REFUND OF THE PURCHASE PRICE PAID, AT SMC’S
OPTION. THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE
AND ARE IN LIEU OF ALL OTHER WARRANTIES OR CONDITIONS, EXPRESS
OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR
OTHERWISE, INCLUDING WARRANTIES OR CONDITIONS OF MERCHANT­ABILITY AND FITNESS FOR A PARTICULAR PURPOSE. SMC NEITHER
ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ANY
OTHER LIABILITY IN CONNECTION WITH THE SALE, INSTALLATION, MAIN­TENANCE OR USE OF ITS PRODUCTS.

SMC SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND
EXAMINATION DISCLOSE THE ALLEGED DEFECT IN THE PRODUCT DOES
NOT EXIST OR WAS CAUSED BY CUSTOMER’S OR ANY THIRD PERSON’S
MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING, UNAUTHORIZED
ATTEMPTS TO REPAIR, OR ANY OTHER CAUSE BEYOND THE RANGE OF
THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, OR OTHER
HAZARD.

LIMITATION OF LIABILITY: IN NO EVENT, WHETHER BASED IN CONTRACT
OR TORT (INCLUDING NEGLIGENCE) SHALL SMC BE LIABLE FOR INCIDEN­TAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF
ANY KIND, OR FOR LOSS OF REVENUE, LOSS OF BUSINESS, OR OTHER
FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION WITH THE SALE,
INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE, OR INTER­RUPTION OF ITS PRODUCTS, EVEN IF SMC OR ITS AUTHORIZED RESELLER
HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. NOTHING
HEREIN SHALL HAVE THE EFFECT OF LIMITING OR EXCLUDING SMC’S
LIABILITY FOR DEATH OR PERSONAL INJURY CAUSED BY NEGLIGENCE.

Some states do not allow the exclusion of implied warranties or the limitation
of incidental or consequential damages for consumer products, so the above
limitations and exclusions may not apply to you. This warranty gives you spe­cific legal rights which may vary from state to state. Nothing in this warranty
shall be taken to affect your statutory rights.

Standard Microsystems Corporation

80 Arkay Drive

Hauppauge, NY 11788

516-273-3100

Compliances............................................................ v

1 About the Hubs................................................ 1

Benefits.................................................................................. 2

Features.................................................................................. 5

2 Installing.......................................................... 7

Locating the Hub................................................................... 8

Equipment Checklist............................................................. 8

Slide-in Modules.................................................................... 9

Rack Mounting ...................................................................... 10

Desktop or Shelf Mounting .................................................. 12

Stacking.................................................................................. 13

Connecting Power................................................................. 15

3 Connecting...................................................... 17

Making Network Connections.............................................. 18

Connecting to Twisted-Pair Cabling..................................... 21

Connecting to Thin Coax Cabling........................................ 26

Connecting to Thick Coax Cabling ...................................... 27

Connecting to Fiber Cabling................................................. 28

4 Segmenting...................................................... 29

The Segmentation Concept................................................... 30

Segmenting the Hub ............................................................. 34

5 Troubleshooting.............................................. 37

Status/Diagnostic LEDs ......................................................... 38

Testing the Installation.......................................................... 41

i

TABLE OF CONTENTS

A Specifications.................................................. 43

TigerStack 3312TA................................................................. 44

TigerStack 3326TA................................................................. 44

TigerStack 3314T................................................................... 45

TigerStack 3328T................................................................... 45

TigerStack 3338TELCO.......................................................... 46

TigerStack 3306BC ................................................................ 46

TigerStack 3306FC................................................................. 47

All TigerStack Hubs............................................................... 47

Stacking Cable....................................................................... 48

B Cables............................................................... 49

Types/Connectors ................................................................. 50

Cable Specifications .............................................................. 51

Extended Distance ................................................................ 53

10BASE-T Pin Assignments................................................... 54

AUI Pin Assignments............................................................. 63

Index........................................................................ 65

ii

TABLE OF CONTENTS

List of Figures

TigerStack 3312TA................................................................. 4

TigerStack 3326TA................................................................. 4

Removing the Screws............................................................ 10

Attaching the Brackets.......................................................... 11

Installing the Hub in a Rack................................................. 11

Attaching the Adhesive Feet................................................. 12

Stacking the Hubs ................................................................. 14

Power Connector on Rear of Hub ....................................... 15

Attaching a Transceiver to the AUI Port.............................. 19

Crossover Buttons ................................................................. 21

10BASE-T Connections ......................................................... 23

Wiring Closet Connections via RJ-45 Connectors................ 24

Wiring Closet Connections via Telco Connectors............... 25

Thin Coax Connection via BNC Port ................................... 26

Thick Coax Connection via AUI Port................................... 27

Duplex Fiber Connections via Dual ST Port........................ 28

3326TA Segments A, B, C, and D......................................... 30

3328T Segments A, B, C, and D........................................... 30

3328TELCO Segments A, B, C, and D.................................. 30

3306BC Segments A and B................................................... 30

3306FC Segments A and B.................................................... 30

Segmenting the Stack............................................................ 31

3326TA Segment Switches A, B, C, and D........................... 32

3328T Segment Buttons A, B, C, and D............................... 32

3328TELCO Segment Buttons A, B, C, and D ..................... 32

3306BC Segment Buttons A and B....................................... 32

3306FC Segment Buttons A and B ....................................... 33

Linking 10BASE-T Segments Through a Switch .................. 33

Segmenting the Hubs............................................................ 35

3312TA Front Panel LEDs ..................................................... 38

iii

TABLE OF CONTENTS

3326TA Front Panel LEDs ..................................................... 38

3328T Front Panel LEDs........................................................ 39

3328TELCO Front Panel LEDs.............................................. 39

3306BC Front Panel LEDs..................................................... 39

3306FC Front Panel LEDs ..................................................... 39

RJ-45 Connector Pin Numbers.............................................. 54

25-Pair Telco Connector Pin Numbers................................. 55

List of Tables

Crossover/Straight-Through Wiring Requirements.............. 22

RJ-45 Fixed Crossover and Uplink Ports.............................. 22

Segment Button/Switch Functions ....................................... 35

Front Panel LEDs................................................................... 40

Cable Types and Connectors................................................ 50

Twisted-Pair Link Segment Specifications............................ 51

AUI Cable Specifications....................................................... 51

Thick Coax Cable Specifications .......................................... 51

Thin Coax Cable Specifications............................................ 52

Duplex Fiber Cable Specifications ....................................... 52

Extended Distance Specifications......................................... 53

RJ-45 Pin Assignments .......................................................... 54

50-Pin Telco Pin Assignments .............................................. 56

Straight-Through RJ-45 Pin Assignments.............................. 57

Straight-Through 50-Pin Telco Pin Assignments.................. 58

Crossover RJ-45 Pin Assignments......................................... 60

Crossover 50-Pin Telco Pin Assignments............................. 61

AUI Pin Assignments............................................................. 63

iv

CONTENTS

FCC A

This equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may cause
interference to radio communications. It has been tested and found to comply
with the limits for a Class A computing device pursuant to Subpart B 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, in which case the
user, at his own expense, will be required to take whatever measures may be
required to correct the interference.

Canada Department of Communications - Class A

This digital apparatus does not exceed the Class A limits for radio noise emis­sions from digital apparatus as set out in the interference-causing equipment
standard entitled "Digital Apparatus", ICES-003 of the Department of
Communications.

Cet appareil numérique respecte les limites de bruits radioélectriques applica­bles aux appareils numériques de Classe A prescrites dans la norme sur le
matériel brouilleur : "Appareils Numériques", NMB-003 édictée par le ministère
des Communications.

European Community

This information technology product was found to comply with EC General
Directives 89/336/EEC and 73/23/EEC. An EC Declaration of Conformity was
issued for this product by:

Standard Microsystems (Europe) Limited
2nd Floor, Building B, Berkshire Court, Western Road
Bracknell, Berkshire RG12 1RE, United Kingdom

Japan VCCI Class 1

Australia AS/NZS 3548 (1995)

SMC contact for products in Australia is:
SMC Australia Pty. Ltd., ACN 069 351 613

LVL 66 MLC Center
Martin Place
Sydney NSW 2000
Phone: [phone]
Fax: [phone]

v

COMPLIANCES

DO NOT PLUG A PHONE JACK CONNECTOR INTO ANY OF THE
RJ-45 PORTS. THIS MAY DAMAGE THE DEVICE.

KUN FOR DATA. MÅ IKKE KOPLES TIL TELEFONNETTVERKET.

SÓLO PARA TRANSFERIR DATOS. NO ENCHUFAR EN LA LÍNEA
TELEFÓNICA.

LES RACCORDEURS NE SONT PAS UTILISÉ POUR LE SYSTÈME
TÉLÉFONIQUE.

VAIN TIEDONSIIRTOON. ÄLÄ KYTKE PUHELINLINJAAN.

SOLO PER DATI. NON COLLEGARE ALLE LINEE TELEFONICHE.

NUR FÜR DATENKOMMUNIKATION. NICHT AN TELEFONLEITUNG
ANSCHLIESSEN.

vi

☎

1

Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Stackable . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Segmentable . . . . . . . . . . . . . . . . . . . . . . . . 2

Scalable . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SNMP Manageable . . . . . . . . . . . . . . . . . . . 3

Easy to Install . . . . . . . . . . . . . . . . . . . . . . . 3

Available in a Wide Range of Models . . . . . . 3

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

All Models . . . . . . . . . . . . . . . . . . . . . . . . . 5

Models 3312TA and 3326TA . . . . . . . . . . . . . 6

CHAPTER 1

ABOUT THE HUBS

Benefits

SMC’s TigerStack™hubs provide a powerful combination of
scalable bandwidth, network management, and configuration
options for building high-performance Ethernet networks.
These multi-segment, stackable, workgroup hubs feature unsur­passed flexibility, allowing users to grow or modify their net­works as their needs change.

Several models are available, with a variety of port densities
and a wide range of cabling options, to meet the needs of your
particular installation.

Stackable

A single TigerStack hub supporting a small workgroup can be
expanded to a stack of eight units with up to 224 ports. Since
the entire stack is still counted as one logical repeater (one of
the four repeater hops permitted between any pair of PCs),
TigerStack hubs make it easier to configure the network.

For additional flexibility, all models can be mixed in the same
stack, in any order or combination.

Segmentable

Each hub contains two or four repeater groups. These groups
can be isolated from the stack to form independent 10 Mbps
networks or collision domains. A fully configured stack of
eight hubs can be segmented into up to 32 collision domains.
Reducing the number of nodes on a LAN minimizes contention
for the network and boosts the available bandwidth.

Scalable

Repeater groups, once isolated, can be interconnected via LAN
switches. This TigerStack/switch combination allows band­width to be scaled to workgroups that need it.

2

ABOUT THE HUBS

SNMP Manageable

The optional Network Management Module (NMM) adds moni­toring, control, and fault isolation functions to the LAN. For
economy, only a single NMM is needed to manage an entire
stack, whether it‘s one segment or as many as 32. For flexi­bility, the NMM is field-installable and can be placed in any
hub, not just the top- or bottom-most units. With the NMM, the
stack can be managed in-band and out-of-band (both locally
and remotely) using SMC’s EliteView™or any other SNMP-based
manager.

Easy to Install

TigerStack hubs can be easily installed in a 19-inch equipment
rack or on a desktop or shelf.

Available in a Wide Range of Models

TigerStack hubs are available with 10BASE-T ports for twisted­pair cabling, AUI ports for backbone or mixed media connec­tivity, BNC ports for thin coax cabling, and dual ST ports for
fiber cabling. Their ports are segmentable into as many as four
groups, depending upon the model.

The TigerStack family includes the following models:

• TigerStack 3312TA — a two-segment hub with twelve

10BASE-T ports and two expansion slots for optional AUI,
BNC, dual ST and 10BASE-T ports

• TigerStack 3326TA — a four-segment hub with 26

10BASE-T ports and two expansion slots for optional AUI,
BNC, dual ST and 10BASE-T ports

• TigerStack 3314T — a two-segment hub with 14 10BASE-T

ports

• TigerStack 3328T — a four-segment hub with 28 10BASE-T

ports

• TigerStack 3306BC — a two-segment hub with six BNC

ports, one AUI port, and one 10BASE-T port

3

ABOUT THE HUBS

• TigerStack 3306FC — a two-segment hub with six dual ST

ports, one AUI port, and one BNC port

• TigerStack 3328TELCO — a four-segment hub with 28

10BASE-T ports: 24 ports on two Telco connectors and four
ports on RJ-45 connectors

Since all the TigerStack hubs have the same footprint, only two
— the TigerStack 3312TA and 3326TA — are shown below.

ABOUT THE HUBS

4

TigerStack 3312TA

TigerStack 3326TA

Features

All Models

• Push-buttons or switches to segment each hub into inde­pendent networks

• Front panel LEDs for “status-at-a-glance” troubleshooting:

• Power — one per hub

• NMM — one per hub

• Collision — one per segment

• Segment —one per segment

• Port Status (Link/Partition/Source) — one per port

• Automatic port/segment partitioning and reconnection for
physical level network management and fault tolerance

• Internal transmit/receive crossover on all twisted-pair ports
for connection to adapters with straight-through wiring

• Crossover enable/disable function on one twisted-pair port
in each segment to uplink to a LAN switch or cascade to
another hub with straight-through wiring

• Automatic polarity detection and correction on 10BASE-T
receive pairs to correct miswiring and make connections
simple and quick

• Link integrity checking on all twisted-pair connections

• Smart squelch digital noise filter on all 10BASE-T ports

• Extended distance support for both 10BASE-T and thin coax
cable

• Jabber lock-up protection to prevent overly long
transmissions

• Rack-, table-, or wall-mount chassis design for installation
flexibility

• Internal, auto-ranging power supply

• Reliable point-to-point connections

5

ABOUT THE HUBS

Models 3312TA and 3326TA

The following additional features are provided by Models
3312TA and 3326TA:

• Optional Redundant Power Unit to minimize downtime in
the event of an internal power supply failure

• Two expansion slots for optional slide-in 10BASE-T, BNC,
fiber and AUI modules

• Larger segments — depending on the model, 14-, 21-, or 28­port segments may be formed by combining repeater
groups

ABOUT THE HUBS

6

CHAPTER 2

INSTALLING

7

Locating the Hub . . . . . . . . . . . . . . . . . . . . . . 8

Equipment Checklist . . . . . . . . . . . . . . . . . . . . 8

Package Contents . . . . . . . . . . . . . . . . . . . . 8

Optional Equipment . . . . . . . . . . . . . . . . . . 9

Required Rack-Mounting Tools . . . . . . . . . . 9

Slide-in Modules . . . . . . . . . . . . . . . . . . . . . . . 9

Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . 10

Desktop or Shelf Mounting . . . . . . . . . . . . . . . 12

Stacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Connecting Power . . . . . . . . . . . . . . . . . . . . . . 15

Locating the Hub

The hub can be installed in a standard 19-inch equipment rack,
or on a desktop or shelf. Be sure to follow the guidelines
below when choosing a location:

• Select a suitable location for the hub:

• It should be accessible for installing, cabling, and main­taining the hub.

• The temperature and humidity should be within the
ranges listed in Appendix A.

• The status LEDs should be clearly visible.

• There should be adequate space (approximately two
inches) on all sides for proper air flow.

• Make sure twisted-pair cable is always routed away from
power lines, fluorescent lighting fixtures, and other sources
of electrical interference such as radios, transmitters, etc.

• Make sure that a separate grounded power outlet is within 8
feet (2.44 m) of the hub and is powered from an indepen­dent circuit breaker. As with any equipment, using a filter
or surge suppressor is recommended.

Equipment Checklist

Package Contents

Check that the following equipment is included in your
package:

• The TigerStack hub

• Bracket Mounting Kit, containing two brackets and four
screws for attaching the brackets to the hub

• Four adhesive feet

• This User Guide

• One SMC Warranty Registration Card — be sure to complete
and return this card within 90 days to extend the three-year
warranty to a lifetime warranty

• The appropriate power cord for your country — either US,
Continental or UK

8

INSTALLING

Optional Equipment

The following equipment is not provided:

• Stacking cable, order number SMC3300-CABLE — one is
required for each hub you want to stack

• Rack-mounting screws — four are required for each hub
you want to mount in a rack

Required Rack-Mounting Tools

Be sure to have the following tools available when rack mount­ing your hub:

• Screws for mounting the hub in a rack (not included)

• A screwdriver (Phillips-head or flathead, depending on type
of screws used)

Slide-in Modules

(Models 3312TA and 3326TA Only)

SMC’s TigerStack 3312TA and 3326TA hubs are equipped with
two expansion slots (port 7, port 14) for slide-in modules. AUI,
10BASE2, 10BASE-T and 10BASE-F modules are available.

Port 7 is accessible from the front panel and port 14 is located
on the rear of the hubs.

If you have purchased a slide-in module for port 7 and/or 14,
install the module(s) now. Follow the installation instructions
provided in the slide-in module package.

9

INSTALLING

Rack Mounting

Before rack mounting the hub, pay particular attention to the
following factors:

• Temperature: Since the temperature within a rack assem-

bly may be higher than the ambient room temperature,
check that the rack-environment temperature is within the
operating temperature range specified in Appendix A.

• Mechanical Loading: Do not place any equipment on top

of a rack-mounted unit.

• Circuit Overloading: Be sure that the supply circuit to the

rack assembly is not overloaded.

• Grounding: Rack-mounted equipment should be properly

grounded. Particular attention should be given to supply
connections other than direct connections to the mains.

To rack mount the hub:

1. Remove the two screws from the sides of the unit.

Removing the Screws

2. Attach the brackets using the screws provided in the Bracket
Mounting Kit.

10

INSTALLING

Attaching the Brackets

3. Install the hub in the rack, using four rack-mounting screws
(not provided).

Installing the Hub in a Rack

4. If stacking hubs, install the remaining hubs in the rack, one
atop the other. Then go to “Stacking” later in this chapter.

5. If installing a single hub, go to “Connecting Power” at the
end of this chapter.

11

INSTALLING

Desktop or Shelf Mounting

1. Attach the four adhesive feet to the bottom of the hub.

Attaching the Adhesive Feet

2. Set the hub on a flat surface near an AC power source,
making sure there are at least two inches of space on all
sides for proper air flow.

3. If stacking hubs, install four adhesive feet on each unit and
place each hub squarely on top of the hub below. Then go
to “Stacking” on the next page of this chapter.

4. If installing a single hub, go to “Connecting Power” later in
this chapter.

INSTALLING

12

Stacking

The hubs can be stacked as many as eight high, and all models
can be mixed in the same stack, in any order or combination.

Note: Although hubs can be stacked after being connected to

a power source, it is not recommended as a safe net­working practice.

Before stacking the hubs, pay attention to the following guide­lines:

• Be sure to have one stacking cable for each hub you want
to stack. This cable (order number SMC3300-CABLE) is not
provided with the hub, and must be ordered separately.

• If an NMM is installed in one of the hubs, be sure to set
the Unit ID switch on each hub in the stack to a unique
number. See your NMM User Guide for instructions about
setting the Unit ID switch.

To stack the hubs:

1. Locate the SCSI connectors labeled “A” and “B” on the rear
of each hub (refer to the the illustration on the next page).

2. Attach one end of the stacking cable to the SCSI connector
labeled “B” on the right hand side of the lower hub. Attach
the other end of the cable to the left connector labeled “A”
on the upper hub.

3. Repeat Step 2 until all the hubs (maximum eight) have been
stacked.

4. Go to “Connecting Power” at the end of this chapter.

13

INSTALLING