3Com SuperStack II Dual Speed Hub 500 Podręcznik użytkownika - Strona 4

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If your transceiver module is capable of generating SQE test signals,

ensure that the SQE test function is disabled.

To install a module or transceiver module, refer to the documentation

that accompanies it. If you remove the module or transceiver module in

the future, you must replace the blanking plate to aid the circulation of

cooling air and prevent the entry of dust and debris.

Console Port

Used to connect your management station to the unit for local

management; refer to the user guide that accompanies the

Management Module.

Cascade Ports

Used for connecting the unit to other Dual Speed Hub 500 units or

PS Hubs, to form a stack. You can stack up to eight Dual Speed Hub 500

units.

You can have a maximum of 6m (19.6ft) of cascade cabling

between the top and bottom units in the stack.

The Cascade Cables and Hot Swap Cascade Units that are used

with the Dual Speed Hub 500 are not the same as those used by

the PS Hub.

Connecting Dual Speed Hub 500 Units with Cascade Cables

(Stacking)

To connect Dual Speed Hub 500 units together, using Cascade cables:

1 Position the units as required; rack mounting or wall mounting them

if necessary.

2 Starting with the bottom unit, using a cascade cable:

Connect the cable to the UP port on the unit.

Connect the cable to the DOWN port on the unit directly above

it.

3 Continue up the stack, repeating step 2 for each unit, as shown

below.

Using Hot Swap Cascade Units

To increase the resilience of the stack, you can use Hot Swap Cascade

Units with your Cascade Cables (one Hot Swap Cascade Unit for each

Dual Speed Hub 500). For information on using Hot Swap Cascade Units,

refer to the documentation that accompanies it.

Connecting to a PS Hub

You can connect your Dual Speed Hub 500 stack to the PS Hub using a

Dual Speed Hub – PS Hub Cascade Converter Kit. For information on

using the Cascade Converter Kit, refer to the documentation that

accompanies it.

Self-adhesive Pads

The Dual Speed Hub 500 is supplied with four self-adhesive rubber pads.

Do not apply the pads if you intend to rack or wall mount the

unit.

If the unit is to be part of a free standing stack, apply the pads to each

marked corner area on the underside of the unit. Place the unit on top

of the lower unit, ensuring that the pads locate with the recesses of the

lower unit.

U P

D O W

U P

D O W

U P

D O W

Positioning the Dual Speed Hub 500

CAUTION: When installing the Dual Speed Hub 500 in a stack

of different size units, the Dual Speed Hub 500 must be installed

above the larger units. Do not have a free standing stack of

more than six units.

When deciding where to position the Dual Speed Hub 500 ensure:

It is accessible and cables can be connected easily.

Cabling is away from:

sources of electrical noise such as radios, transmitters and

broadband amplifiers.

power lines and fluorescent lighting fixtures.

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 (1in.) clearance).

To prolong the operational life of your units:

Never stack units more than six high if free standing, and ensure

that cables are supported so that they do not cause the stack to

fall over.

Do not place objects on top of any unit or stack.

Do not obstruct any vents at the sides of the case.

Rack or Wall Mounting

The Dual Speed Hub 500 can be mounted in a 19in. equipment rack, or

wall-mounted using the Mounting Kit. Refer to the " Mounting Kit

Instructions " section in this guide.

Power Up

Use the following sequence to power up the Dual Speed Hub 500:

Check the network connections and cables.

Connect the power supply cable to the appropriate power socket

on the rear panel of the unit, refer to 7 or 8 .

Connect the plug to the power supply outlet socket and switch

on the power supply at the socket. If you are using the Advanced

Redundant Power System, ensure that it is powered on.

When the Dual Speed Hub 500 is powered on, the Power LED should be

lit. If it is not, refer to " Power/Self test LED ", 6 .

Spot Checks

At frequent intervals you should visually check the Dual Speed Hub 500.

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:

Cabling

Check that all external cabling connections are

secure and that no cables are pulled taut.

Cooling fans

Check that the cooling fan is operating by

listening to the unit. The fan is fitted near to the

front right hand side of the unit (when viewed

from the front).

What To Do Next?

If the Dual Speed Hub 500 fails to operate successfully, contact your

supplier with the following information before returning the unit:

product number and serial number

(printed on a label on the bottom of the unit)

a brief description of the fault

When returning any equipment to your supplier ensure that the

equipment is packed suitably for transit.