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Hot Swap Cascade Units are for use with SuperStack II Port Switch Hubs. They

connect your cascade cables together, forming a resilient cascade, to which you

connect your Port Switch Hubs. You can add and remove hubs without affecting

stack performance, and if a hub fails, the cascade information continues to flow

between the other hubs.

The Hot Swap Cascade Unit is refered to as

‘cascade unit’

in this User Guide.

Assembling the Cascade Unit

The cascade unit is packaged with two long lockscrews. Push them through the

holes in the cascade unit (as shown below) until they lock in place.

Dimensions

Hot Swap Cascade Unit

UP

DOWN

Using Cascade Units

Cascade units are quick and easy to use. You need:

■

One cascade unit for each hub in the stack.

■

A maximum of 6 meters (19.6 feet) of cascade cabling (between the top and bottom

hub). SuperStack II Port Switch Hub cascade cables are available in a variety of

lengths from your supplier.

To use your cascade units:

1

Connect the cascade units with the cascade cables (as shown in diagram

A

below):

■

Connect the cables’ UP connectors to the UP ports of the cascade units.

■

Connect the cables’ DOWN connectors to the DOWN ports of the cascade units.

Secure the cables by tightening the cables’ captive screws, finger tight.

2

Connect the cascade units to the back of the hubs (as shown in diagram

B

below).

Tighten the cascade units’ long screws to hold them firmly in place.

Never disconnect any of the cascade cables from the cascade units, when the stack is

in use, because doing so will break the cascade. If you want to remove a hub,

unscrew the cascade unit’s long screws and separate the cascade unit from the hub.

Hot Swap Cascade Unit

UP DOWN

Hot Swap Cascade Unit

UP DOWN

Hot Swap Cascade Unit

UP DOWN

DOWN

DOWN

UP

UP

Hot Swap Cascade Unit

UP DOWN

Hot Swap Cascade Unit

UP DOWN

Hot Swap Cascade Unit

UP DOWN

DOWN

DOWN

UP

UP

B

A

Part No. DUA1643-0AAA01 / Published July 1996

© 3Com Ireland, 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 is a registered trademark of 3Com Corporation. SuperStack is a trademark of 3Com

Corporation. Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or

may not be registered in other countries.