3Com Switch II Hub 10 User Manual

SuperStack™ II Hub 10  
Telco (3C16672A)  
User Guide  
TECHNICAL INFORMATION  
Related Standards  
The Hub 10 Telco has been designed to conform to the following  
standards:  
Electrical  
Hub 10 Telco only  
Power Inlet  
IEC 320  
2 Amps  
22 VA  
Functional  
Safety  
ISO 8802/3, IEEE 802.3  
Fuse Protection  
Power Consumption  
Power Dissipation  
UL 1950, EN 60950, CSA 22.2 #950  
EMC  
EN 55022 Class B, EN 50082-1, FCC Part 15 Class A,  
CSA C108.8 Class A  
73 BTU/hr  
(screened cables must be used to ensure  
compliance with these standards)  
Hub 10 Telco & Management Module  
Power Inlet  
IEC 320  
2 Amps  
30 VA  
Environmental EN 60068 (IEC 68)  
Fuse Protection  
Power Consumption  
Power Dissipation  
Physical  
Width  
440mm (17.3 ins)  
224mm (8.8 ins)  
44mm (1.7 ins) or 1U  
2.6kg (5.7lb)  
100 BTU/hr  
Depth  
Environmental  
Operating Temperature  
Humidity  
Height  
Weight  
Mounting  
0-50°C (32-122°F)  
0-90% (non-condensing)  
free standing,  
or 19" rack or wall mounted using kit supplied  
DUA1667-2AAA03  
 
INTRODUCTION  
The SuperStack™ II Hub 10 Telco (3C16672A) has two 12 port Telco  
connectors on the front panel providing Ethernet TP port connections,  
and an AUI port on the rear panel. The rear panel also has a slot for a  
3Com Transceiver Module or Bridge MicroModule: if fitted the module  
will operate in addition to the AUI port. A range of different media  
Transceiver Modules is available from 3Com (see “Products and Bulletin  
unit will be disabled during power-up until they are correctly configured  
and enabled by management software. This is only necessary on units  
which have ports assigned as standby. Standby ports in resilient link  
pairs can only be configured on SuperStack II Hub 10 or LinkBuilder  
FMS II units.  
Security features are described in the manual which comes with your  
Hub 10 Management Module.  
The Hub 10 Telco can be stand-alone or linked with other Hub 10,  
LinkBuilder FMS II, FMS, 10BT or 10BTi units to form a stack of units of  
different media. Stacking units gives you the benefit of a higher port  
count while the stack is still seen by the network as a single 802.3  
repeater.  
By disabling ports on boot up and enabling them with management  
software, you provide extra security for your unit.  
During the power up sequence, the main ports (on the front  
panel) will be disabled, BUT the AUI and Transceiver Module  
i
ports will be enabled for periods up to 1 second. During this  
brief moment, the AUI and Transceiver Module ports will NOT  
be secure.  
The Hub 10 Telco is suited for use in the office where it can be  
wall-mounted, rack-mounted, or free standing. Alternatively, the unit can  
be rack-mounted in a wiring closet or equipment room. A mounting kit  
is supplied.  
Network Connections  
The Hub 10 Telco has been designed for use with the majority of known  
Telco connectors.  
The Hub 10 Telco can be powered either from the AC mains supply, or  
through an optional 3Com Redundant Power System (3C565047) to  
provide a more reliable supply. Contact your local supplier for details.  
Cable fixings have been supplied for holding the Telco cables to the  
unit. There are locations for these fixings to the left of the Telco  
connectors.  
Repeater Functions  
The Hub 10 Telco has been designed to conform to the IEEE 802.3  
standard for Local Area Networks. The unit provides all the standard  
functions of an 802.3 repeater, including:  
In the unlikely event that your Telco connector will not connect fully to  
the Hub 10 Telco, we recommend that you:  
Signal retiming  
Use a connector extension  
Preamble regeneration  
Fragment extension  
Use a Telco connector with a different cable approach  
You can connect any 802.3 transceiver to the unit using an AUI cable  
connected to the AUI port on the rear panel. Alternatively, you can fit  
one of the 3Com Transceiver Modules or a Bridge MicroModule into the  
slot on the rear panel (see “Products and Bulletin Boards”).  
Automatic partition/reconnection  
Management  
A SuperStack II Hub 10 Management Module (3C16630A) or Advanced  
RMON Module (3C16632) can be fitted to the Hub 10 Telco to provide  
full SNMP management, including statistics, resilient links and security  
features. Only one Management Module or Advanced RMON Module is  
required for each stack. Refer to the guides accompanying the module  
for details on how to manage an Hub 10 unit or stack.  
You can connect the Hub 10 Telco to any other 10Base-T unit using port  
24, to form an inter-repeater link. You must switch port 24 to MDI to  
bypass the internal cross-over normally implemented by 10Base-T unit  
ports. See “MDI Switch”.  
Resilience and Security  
Hub 10 Management Module (3C16630A) and Hub 10 Advanced RMON  
Important  
To manage this hub, you may need a new version of the agent  
software installed on your Management Module. See “Stack  
Management” for details.  
Module (3C16632) offer resilience and security features.  
Up to 16 resilient link pairs can be configured via management software.  
To avoid the creation of loops during power-up, Hub 10 units provide a  
Disable On Boot switch. If this switch is set to disable, all TP ports on the  
HOW TO USE THE HUB 10  
Numbered elements in this diagram refer to numbered sections in the text.  
The numbers, in bold, are used as references in the text.  
 
 
The Transceiver Module port may partition if the SQE test pulse is  
enabled on its transceiver. SQE test should be disabled on transceivers  
used to connect 802.3 repeaters to the network.  
Front Panel  
1
24 Telco Ports  
5
AUI LED  
A range of Telco connectors can be used with the Hub 10 Telco. Refer to  
“Introduction” for more information.  
The AUI LED lights red if the AUI port has partitioned. Refer to “STATUS  
LEDs”, 3, for information on what to do if a segment is partitioned.  
CAUTION: Do not over-tighten the screws on the Telco  
connectors.  
An AUI port connected to coaxial cable segment may partition  
i
if the segment is incorrectly terminated.  
2
MDI Switch  
The AUI port may partition if the SQE test pulse is enabled on its  
transceiver. SQE test should be disabled on transceivers used to connect  
802.3 repeaters to the network.  
The Media Dependent Interface (MDI) switch controls the operation of  
port 24. The switch is recessed and can be operated using a ball-point  
pen or similar instrument.  
6
UNIT LEDs  
Out In this position you can connect port 24 to a  
workstation or any other DTE.  
The UNIT LEDs indicate the position of this unit in the stack, providing a  
Management Module or Advanced RMON Module has been fitted to a  
unit in the stack. The appropriate UNIT LED will light green; if this unit  
has a Management Module (or Advanced RMON Module) fitted, it will  
show as unit number 1. If the unit is in a stack which does not contain a  
Management Module or Advanced RMON Module, the UNIT LEDs will  
not light.  
MDIX  
In  
In this position you can connect port 24 to any  
internal cross-over (X) port on another 10Base-T  
repeater using normal twisted pair cable to form an  
inter-repeater link.  
MDI  
To form an inter-repeater link using two Hub 10 Telcos, connect port 24  
on unit 1 to any port on unit 2. Ensure that the MDI switch on unit 1 is  
IN (MDI) and that if port 24 is used on unit 2, the MDI switch is OUT  
(MDIX).  
7
Power LED  
The Power LED lights green to indicate the power supply to the unit is  
correct. If it is not lit, and:  
3
STATUS LEDs  
None of the ports work  
Check the fuse in the IEC socket and the  
fuse within the power cable's plug (if  
fitted).  
The STATUS LEDs show the partition state of a port and whether or not  
the Link Pulse signal is present on the segment connected to a port  
Green The Link Pulse signal is being received and the segment  
attached to the port is functional. If the port does not  
transmit/receive, check the Disable On Boot switch, 15, is  
Enabled.  
The AUI and Transceiver  
Module ports do not work, supply to the AUI and Transceiver  
but the twisted pair ports  
work  
The internal fixed fuse for the power  
Module ports has blown. Contact your  
supplier.  
Red  
The Link Pulse signal is being received and the port is  
partitioned from the network.  
All ports function normally The LED has failed. Contact your supplier.  
8
MGMT LED  
Check the connections and the cable for any breaks in the  
segment.  
The MGMT LED indicates the status of the Management Module or  
Advanced RMON Module if fitted.  
Make sure the transceiver attached to the DTE is correctly  
connected and powered up.  
.
Off  
There is no Management Module or Advanced RMON  
Module fitted to the Hub 10 Telco or the internal  
connection to it has been broken.  
Check for illegal 802.3 configurations, in particular, loops.  
Check that the Disable On Boot switch, 15, is set for units  
with standby ports in resilient links.  
Green/(Yellow) The Management Module (or Advanced RMON  
Module) is fitted and functioning normally.  
If the cause of the partition is found and corrected, the segment  
is reconnected automatically, after the first valid packet is  
transmitted to, or received from the segment.  
Green flashing Management agent software is being downloaded.  
Red  
There is a fault on the Management Module (or  
Advanced RMON Module) or one of the units in the  
stack. Check all connections and refer to the  
Management Module guide for more information.  
Off  
The Link Pulse signal is not being received.  
Check that the attached DTE is switched on.  
Check that the Link Pulse signal has not been disabled by  
management software.  
9
Packet LED  
Check that the attached transceiver is not faulty.  
The Packet LED flashes yellow whenever a packet is received on one of  
the 12 twisted pair ports, the AUI port, or the Transceiver Module port.  
If it is an inter-repeater link, check the setting of the MDI  
switch.  
If this LED does not flash, there are no packets being received by the  
unit.  
Carry out the checks recommended for when a STATUS LED  
is red.  
10 Collision LED  
Check for no more than 4 repeater stacks in series, and that  
cable lengths do not exceed the maximum specified in the  
standard for that medium.  
The Collision LED flashes yellow when a packet collision has been  
detected on a segment connected to one of the 24 Telco ports, the AUI  
port, or the Transceiver Module port.  
If these checks do not identify the cause of a problem, it may be that the  
Hub 10 Telco or the device connected to the port is faulty. Contact your  
supplier for further advice.  
Under normal 802.3 operation, collisions occur and cause the Collision  
LED to flash. The probability of collisions increases during heavy activity  
on the network. The Auto Partition/Reconnection function partitions a  
segment from the rest of the network if more than 64 consecutive  
collisions are detected on that segment.  
4
TCVR LED  
The TCVR LED lights red if the Transceiver Module port has partitioned.  
Refer to “STATUS LEDs”, 3, for information on what to do if a segment is  
partitioned.  
A transceiver module port connected to coaxial cable segment  
may partition if the segment is incorrectly terminated.  
i
 
     
14 Hub Expansion Connectors  
Rear Panel Connection  
You can connect units together in a stack to form a single logical  
repeater. You need one Hub Expansion Cable (3C625) for each additional  
unit in the stack. The diagram below shows how you connect units  
together. Do not use two cables to connect any two units to each other  
- they will not work if you do this.  
11 Power Supply and Fuse  
Correct fuse location  
L’emplacement du fusible correct  
Richtige Stellung der Sicherung  
Spare fuse location - DO NOT USE  
L’emplacement du fusible incorrect - NE PAS UTILISER  
Falsche Stellung der Sicherung - NICHT VERWENDEN  
Disconnect power from all units that will form part of the new  
stack. Connect the male hub expansion connector of one unit to the  
female hub expansion connector of the next unit. Repeat this process  
until all the units are connected together. Refer to “Stacking Units” for  
the number of units allowed in a stack.  
WARNING: Ensure that the power supply is disconnected before  
opening the fuse holder cover.  
The Hub 10 Telco automatically adjusts to the supply voltage.  
The fuse is suitable for both 110V A.C. and 220-240V A.C.  
operation.  
CAUTION: If you intend to rack or wall mount the units,  
connect the units after they have been mounted.  
15 Disable On Boot Switch  
To change the fuse, release the fuse holder by gently levering a  
small screwdriver under the fuse holder catch. Only 2A  
anti-surge type fuses of the same type and manufacture as the  
original should be used with the Hub 10 Telco. Close the fuse  
holder.  
This switch is located behind the blanking plate covering the  
Management Module slot, 13. The unit is shipped with this switch set to  
Enable.  
CAUTION: Do not disable ports unless you have a  
management module installed in the stack.  
Enable  
AVERTISSEMENT: Assurer que l'alimentation soit débranchée  
avant d'ouvrir le couvercle du contenant du fusible.  
TP ports on front panel are enabled on power up. They  
may be subsequently disabled via management software.  
L'unité s'ajuste automatiquement à la tension d'alimentation.  
Le fusible est convenable aux deux opérations 110 V C.A. et  
220-240 V C.A.  
Disable  
TP ports on front panel are disabled on power up until  
management software enables them. This is required for  
standby ports in resilient links.  
Pour changer le fusible, dégager le contenant du fusible en  
mettant doucement un petit tournevis sous l'arrêt de  
contenant du fusible. Seulement les fusibles de types 2A  
anti-transitoires du même type et fabricant que l'original  
doivent être utilisés.  
16 Management / Advanced RMON Module Power Cable  
Connector  
This plug, located behind the blanking plate, provides power to an Hub  
10 Management Module or Advanced RMON Module, if fitted and  
connected. See the guide accompanying the module for installation  
instructions.  
WARNUNG: Vor dem Öffnen der Sicherungshalterung das Gerät  
vom Netzstrom trennen.  
Das Gerät stellt sich automatisch auf die  
Versorgungsspannung ein. Die Sicherung ist sowohl für 110V  
A.C. wie für 220-240V A.C. geeignet.  
17 AUI Port  
You can connect the unit to any 802.3 transceiver using an AUI cable  
(sometimes known as a transceiver cable or drop cable). Connect one  
end of the AUI cable to the AUI port on the rear panel of the unit and  
the other end to the AUI port on the transceiver. Engage the slide locks  
at both ends of the AUI cable.  
Zum Auswechseln der Sicherung durch leichtes Heben mit  
einem kleinen Schraubenzieher die Abdeckungsklappe der  
Sicherungshalterung lösen. Sicherungen nur durch gleichen  
Typ und Wert wie die Originalsicherung ersetzen. Sicherung  
auswechseln und die Klappe der Sicherungshalterung wieder  
schließen.  
Ensure that SQE test is disabled.  
18 Transceiver Module Slot  
12 Socket for Redundant Power System  
A variety of 3Com plug-in Transceiver Modules or the Bridge  
MicroModule can be installed in the Hub 10 Telco (see overleaf for a list).  
Transceivers provide direct network connections to different media.  
Only connect a 3Com Redundant Power System, option 3C565047, to  
this socket. For details, follow the installation instructions in the guide  
accompanying the Redundant Power System.  
CAUTION: Do not remove the Transceiver Module blanking  
plate with the power still connected.  
13 Management Module or Advanced RMON Module Slot  
Ensure that SQE test is disabled.  
The Hub 10 Telco can be fitted with an optional SuperStack II Hub 10  
Management Module or Advanced RMON Module. When the module  
has an IP/IPX address, you can then use SNMP management to manage  
the stack containing the unit.  
To install a Transceiver Module, refer to the guide that accompanies it. If  
you subsequently remove the Transceiver Module, you must replace the  
blanking plate to aid the circulation of cooling air and prevent the entry  
of dust and debris.  
CAUTION: Do not remove the Management Module blanking  
19 Self-adhesive Pads  
plate with the power still connected.  
The Hub 10 Telco is supplied with 4 self-adhesive rubber pads. If the unit  
is to be part of a free standing stack, apply the pads to the underside of  
the unit; stick a pad in the marked area at each corner of the unit. Place  
the units on top of each other, ensuring that the pads of the upper unit  
locate with the recesses of the lower unit.  
For instructions on installing either module in an Hub 10 unit, refer to  
the guide that accompanies the module. You will need to remove the  
blanking plate to reveal the slot for the module.  
If you subsequently remove the Management or Advanced RMON  
Module from the Hub 10 unit, you must replace the blanking plate to aid  
the circulation of cooling air and prevent the entry of dust and debris.  
Do not apply the pads if you intend to rack or wall mount the unit.  
 
Managing with an FMS Management Module  
Siting the Hub 10 Telco  
rack mounted stacks: the module must be fitted to an FMS unit at  
the top or bottom of the stack.  
CAUTION: When installing the Hub 10 Telco in a stack with  
FMS units, the Hub 10 Telco must be installed beneath any FMS  
units.  
free standing stacks:  
the module must be fitted to an FMS unit at  
the top of the stack.  
When deciding where to site the Hub 10 Telco ensure:  
Managing with a Hub 10 (FMS II) Management  
Module (3C16630A) or Advanced RMON Module  
(3C16632)  
It is accessible and cables can be connected easily.  
Cabling is away from:  
sources of electrical noise such as radios, transmitters and  
broadband amplifiers.  
rack mounted stacks: the module must be fitted to a Hub 10 (FMS II)  
unit at the top or bottom of the stack.  
power lines and fluorescent lighting fixtures.  
free standing stacks:  
the module must be fitted to a Hub 10 (FMS II)  
unit at the bottom of the stack.  
Water or moisture cannot enter the case of the unit.  
Air flow around the unit and through the vents in the side of the  
case is not restricted (3Com recommend that you provide a  
minimum of 25mm (1 inch) clearance).  
If you have a Hub 10, LinkBuilder FMS or FMS II unit fitted with a  
Management Module, and a LinkBuilder 10BTi in your stack, the Hub 10,  
FMS or FMSII Management Module will manage the stack.  
The LinkBuilder 10BTi can only manage LinkBuilder 10BT units  
To prolong the operational life of your units:  
and the FMS Telco Hub (3C16271). 10BTi cannot manage other  
FMS units or any Hub 10 (FMS II) units.  
i
Never stack units more than eight high if free standing.  
Do not place objects on top of any unit or stack.  
Do not obstruct any vents at the sides of the case.  
Power Up  
Use the following sequence to power up the Hub 10 Telco:  
Rack or Wall Mounting  
Check the Disable On Boot switch at the rear and select position  
as appropriate: see 15.  
The Hub 10 Telco can be mounted in a 19 inch equipment rack or else  
wall-mounted using the LinkBuilder Rack Mounting Kit. See “Rack  
Check the network connections and cables.  
Check the hub expansion cables if in a stack.  
Stacking Units  
The Hub 10 Telco can be linked to other Hub 10 units to form a stack, or  
can be part of a mixed stack consisting of Hub 10, FMS, FMS II, 10BT or  
10BTi units.  
Connect the power supply cable to the appropriate power socket  
on the rear panel of the unit, see 11 or 12.  
Connect the plug to the power supply outlet socket and switch  
on the power supply at the socket. If you are using a 3Com  
Redundant Power Supply make sure it is switched on.  
Different rules apply on stacking units if the stack only consists of Hub  
10 and/or FMS II units compared to a stack with other mixed units.  
When the Hub 10 Telco is powered up, the Power LED should be lit. If it  
is not, refer to “Power LED”, 9.  
Hub 10/FMS II only stacks  
Up to 8 Hub 10 (FMS II) units can be linked together to form a free  
standing stack or be mounted in a 19 inch rack, in a managed or  
unmanaged configuration.  
Spot Checks  
At frequent intervals you should visually check the Hub10 Telco. Regular  
checks can give you an early warning of a possible failure; any problems  
can then be attended to when there will be least effect on users. Check  
the following:  
Only fit a Hub 10 or LinkBuilder FMS II Management Module or  
Advanced RMON Module, to either the unit at the top or bottom of the  
stack.  
Cabling  
Check that all external cabling connections are  
secure and that no cables are pulled taut.  
Mixed stacks of Hub 10/FMS II/FMS/10BT/10BTi  
Link up to 8 units in a free standing stack or mounted in a rack. But any  
FMS, 10BT or 10BTi units must be units 1-4 in a managed stack.  
Cooling fans  
Check that the cooling fans are operating and are  
not obstructed. The fans are fitted to the right  
hand side of the unit when viewed from the front.  
If mixing Hub 10 (FMS II) and FMS units in a free standing stack, the  
narrower FMS units must be positioned at the top of the stack. This  
restriction does not apply if rack mounting the units.  
Transceiver Module Check that the Transceiver Module is connected  
securely. Refer to the guide provided with the  
Transceiver Module.  
Stack Management  
To manage any stack containing a Hub 10 unit, the Management  
Module must have the correct version of the agent installed. The table  
below details the minimum agent version numbers for each  
management module.  
What To Do Next?  
If the Hub 10 Telco fails to operate successfully, contact your supplier  
with the following information before returning the unit:  
product number  
3C16030  
3C16630  
3C16630A  
3C16632  
LinkBuilder FMS Management Module  
LinkBuilder FMS II Management Module  
SuperStack II (FMS II) Management Module  
3.04  
3.04  
3.14  
serial number  
a brief description of the fault  
When returning any equipment to your supplier make sure the  
equipment is packed suitably for transit.  
SuperStack II (FMS II) Advanced RMON Module 1.01  
Check which version you have installed before adding a Hub 10 unit to  
your stack.  
If you need to upgrade your agent, and a disk containing the new  
versions is not included in the packaging, a free upgrade is available  
from the 3Com bulletin boards (see “Products and Bulletin Boards”). The  
upgrade includes instructions on how to load the agent.  
 
     
PRODUCTS AND BULLETIN BOARDS  
Products  
Bulletin Boards  
Management agent software upgrades are available from these 3Com  
bulletin boards:  
SuperStack II Hub 10 is part of the SuperStack II range of 3Com  
products. Contact your supplier for the latest product information.  
Australia  
France  
(61) (2) 9955 2073  
(33) (1) 69 86 69 54  
Japan  
(81) (3) 3345 7266  
Hub 10 hubs  
3C16670A SuperStack II Hub 10 12Port TP  
3C16671A SuperStack II Hub 10 24Port TP  
3C16672A SuperStack II Hub 10 24Port Telco  
3C16665A SuperStack II Hub 10 6Port ST Fiber Optic  
Singapore (65) 534 5693  
Germany  
(49) (89) 627 32 188  
or 627 32 189  
Taiwan  
(886) (2) 377 5838  
Hong Kong (852) 2537 5608  
U.K.  
U.S.  
(44) (1442) 438278  
(1) (408) 980 8204  
Hub 10 management  
3C16630A SuperStack II Hub10 Management Module  
3C16632 SuperStack II Hub10 Advanced RMON Module  
Italy  
(39) (2) 273 00680  
(fee required)  
3Com Corporation  
P.O. Box 58145  
5400 Bayfront Plaza  
Santa Clara  
CA 95052-8145  
USA  
c/o 3Com Centre  
Transceiver Modules  
3C12060 Female AUI  
Boundary Way  
Maylands Park South  
Hemel Hempstead  
Herts HP2 7YU  
UK  
3C12065 Fiber Optic (ST)  
3C12066 Coaxial  
3C12067 FB  
3C12063 TP  
3C12064 Fan Out (male AUI)  
3C16060 Bridge MicroModule  
RACK MOUNTING KIT INSTRUCTIONS  
To wall mount the Hub 10 unit(s):  
Introduction  
The Hub 10 Telco is supplied with two mounting brackets and four  
screws. These are used for rack mounting and wall mounting the unit.  
When mounting the unit, you should take note of the guidelines given  
in the section “Siting the Hub 10 Telco” overleaf.  
Ensure that the wall you are going to use is smooth, flat, dry and sturdy.  
Attach a piece of plywood (12" x 20" x 0.5") securely to the wall if  
necessary, and mount the Hub 10 unit(s) as follows:  
Position the unit(s) against the wall (or plywood) ensuring that  
the ventilation holes face sideways. Mark on the wall the position  
of the screws holes for both wall brackets. Drill the four holes.  
Wall Mounting Hub 10 Units  
CAUTION: Disconnect all cables from the Hub 10 unit(s) before  
continuing. Remove the self-adhesive pads from underside of  
the unit(s), if already fitted.  
Using suitable fixings and screws (not provided), attach the unit(s)  
securely to the wall (or plywood).  
Fitting the brackets to wall mount one unit  
Reconnect all cables.  
Place the Hub 10 unit the right way up on a hard, flat surface with  
the front facing towards you.  
Rack Mounting Hub 10 Units  
The Hub 10 Telco is 1U high and will fit a standard 19inch rack.  
Locate a mounting bracket over the mounting holes on one side  
of the unit, as shown in figure 1 below.  
CAUTION: Disconnect all cables from the Hub 10 unit before  
continuing. Remove the self-adhesive pads from underside of  
unit, if already fitted.  
Insert the two screws and fully tighten with a screwdriver.  
Repeat the last two steps for the other side of the Hub 10 unit.  
Place the unit the right way up on a hard, flat surface with the  
front facing towards you.  
Fitting the brackets to wall mount two units  
Locate a mounting bracket over the mounting holes on one side  
of the unit, as shown in figure 3 below.  
Stack the Hub 10 units the right way up on a hard, flat surface  
with the front facing towards you.  
Insert the two screws and fully tighten with a suitable screwdriver.  
Repeat the two previous steps for the other side of the unit.  
Locate two mounting brackets over the mounting holes on one  
side of the units, as shown in figure 2 below.  
Insert the three screws and fully tighten with a screwdriver.  
Insert the unit into the 19" rack and secure with suitable screws  
(not provided).  
Repeat the last two steps for the other side of the units.  
Reconnect all cables.  
 
   
LIMITED WARRANTY  
For first five years - +5 Lifetime Limited Warranty  
Center during the applicable warranty period. Standard warranty service for software  
products may be obtained by telephoning 3Com's Corporate Service Center or an  
Authorized 3Com Service Center, within the warranty period. Products returned to  
3Com's Corporate Service Center must be pre-authorized by 3Com 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 3Com's expense, not later than thirty (30) days after  
receipt of the defective product by 3Com.  
The SuperStack II Hub 10 Fiber benefits from 3Com’s enhanced +5 Lifetime Limited  
Warranty. This provides a full 5 years of advanced hardware exchange from your date of  
purchase in accordance with 3Com’s standard terms and conditions. To qualify, you must  
submit your warranty registration card to 3Com. After the initial 5 year period, the  
warranty reverts to 3Com’s standard lifetime limited warranty. The +5 Lifetime Limited  
Warranty is not offered or is void where restricted or prohibited by law.  
After first five years - Lifetime Limited Warranty  
The duration of the 3Com standard lifetime limited warranty is lifetime, excluding the  
power supply and fans. See below for terms and conditions of this warranty.  
Warranties Exclusive: IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED  
ABOVE, CUSTOMER'S SOLE REMEDY FOR BREACH OF THAT WARRANTY SHALL BE REPAIR,  
REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM'S OPTION. TO THE  
FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES AND REMEDIES ARE  
EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CONDITIONS,  
EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR  
OTHERWISE, INCLUDING WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY,  
FITNESS FOR A PARTICULAR PURPOSE, AND SATISFACTORY QUALITY. 3COM 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.  
Hardware: 3Com warrants its hardware products to be free from defects in workmanship  
and materials, under normal use and service, for the following lengths of time from the  
date of purchase from 3Com or its Authorized Reseller:  
Network adapters  
Lifetime  
Other Hardware products  
Spare parts and spare kits  
One year (unless otherwise specified above)  
90 days  
If a product does not operate as warranted above during the applicable warranty period,  
3Com 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 3Com. 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.  
3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION  
DISCLOSE THAT 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 MODIFY, OR ANY  
OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE,  
LIGHTNING, OR OTHER HAZARD.  
3Com shall not be responsible for any software, firmware, information, or memory data  
of Customer contained in, stored on, or integrated with any products returned to 3Com  
for repair, whether under warranty or not.  
Limitation of Liability: TO THE FULL EXTENT ALLOWED BY LAW 3COM ALSO EXCLUDES  
FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRACT OR TORT  
(INCLUDING NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR  
PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR PROFITS, LOSS OF  
BUSINESS, LOSS OF INFORMATION OR DATA, 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 3COM OR ITS AUTHORIZED  
RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, AND LIMITS ITS  
LIABILITY TO REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT  
3COM'S OPTION. THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE AFFECTED  
IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.  
Software: 3Com warrants that the software programs licensed from it will perform in  
substantial conformance to the program specifications therefor for a period of ninety  
(90) days from the date of purchase from 3Com or its Authorized Reseller. 3Com warrants  
the media containing software against failure during the warranty period. No updates  
are provided. 3Com's sole obligation with respect to this express warranty shall be (at  
3Com'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 3Com's applicable published specifications. Customer assumes responsibility  
for the selection of the appropriate applications program and associated reference  
materials. 3Com makes no warranty or representation 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 3Com software product documentation or specifications as being  
compatible, 3Com will make reasonable efforts to provide compatibility, except where  
the non-compatibility is caused by a "bug" or defect in the third party's product.  
Some countries, states, or provinces do not allow the exclusion or limitation of implied  
warranties or the limitation of incidental or consequential damages for certain products  
supplied to consumers or the limitation of liability for personal injury, so the above  
limitations and exclusions may be limited in their application to you. This warranty gives  
you specific legal rights which may vary depending on local law.  
Governing Law: This Limited Warranty shall be governed by the laws of the state of  
California.  
3Com Corporation, 5400 Bayfront Plaza, Santa Clara, CA, 95052-8145, U.S.A.  
Tel: (408) 764-5000  
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 3Com's Corporate Service Center or to an Authorized 3Com Service  
9/1/96  
ELECTRO MAGNETIC OMPATABILITY  
-
C
FCC Statement  
CSA Statement  
This equipment has been tested and found to comply with the limits for a class A digital  
device, pursuant to part 15 of FCC Rules. These limits are designed to provide reasonable  
protection against interference when the equipment is operated in a commercial  
environment. This equipment generates, uses and can radiate radio frequency energy  
and, if not installed and used in accordance with the instruction manual, may cause  
harmful interference with radio communications. Operation of this equipment in a  
residential area is likely to cause harmful interference in which case the user will be  
required to correct the interference at his own expense.  
This Class A digital apparatus meets all requirements of the Canadian  
interference-Causing Equipment Regulations.  
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le  
matériel brouilleur du Canada.  
LEGAL NOTICES  
3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145  
For civilian agencies:  
Restricted Rights Legend: Use, reproduction or disclosure is subject to restrictions as set  
forth in subparagraph (a) through (d) of the Commercial Computer Software - Restricted  
Rights Clause at 48 C.F.R. 52.227-19 and the limitations set forth in 3Com Corporation's  
standard commercial agreement for the software. Unpublished rights reserved under the  
copyright laws of the United States.  
© 3Com Ireland, May 1996. All rights reserved. No part of this documentation may be  
reproduced in any form or by any means or used to make any derivative work (such as  
translation, transformation, or adaptation) without permission from 3Com Ireland.  
3Com Ireland reserves the right to revise this documentation and to make changes in  
content from time to time without obligation on the part of 3Com Ireland to provide  
notification of such revision or change.  
Unless otherwise indicated, registered trademarks are registered in the United States and  
may or may not be registered in other countries.  
3Com Ireland provides this documentation without warranty of any kind, either implied  
or expressed, including, but not limited to, the implied warranties of merchantability and  
fitness for a particular purpose. 3Com may make improvements or changes in the  
product(s) and/or the program(s) described in this documentation at any time.  
3Com and LinkBuilder are registered trademarks of 3Com Corporation. SuperStack II and  
FMS are trademarks of 3Com Corporation. Other brand and product names may be  
registered trademarks or trademarks of their respective holders.  
The technology behind 3Com's LAN Security Architecture is protected by U.S. patents  
5,161,192 and 5,386,470 (foreign patents applied for).  
UNITED STATES GOVERNMENT LEGENDS:  
If you are a United States government agency, then this documentation and the  
software described herein are provided to you subject to the following restricted rights:  
For units of the Department of Defense:  
Restricted Rights Legend: Use, duplication or disclosure by the Government is subject to  
restrictions as set forth in subparagraph (c) (1) (ii) for restricted Rights in Technical Data  
and Computer Software clause at 48 C.F.R. 52.227-7013. 3Com Ireland, c/o 3Com Centre,  
Boundary Way, Maylands Park South, Hemel Hempstead, Hertfordshire, HP2 7YU, UK.  
Part Number: DUA1667-2AAA03  
Revision: 01  
Published: December 1996  
 

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