Bay BayStack 400-ST1 Manuel d'instructions télécharger pdf (Page 18)

Redundant Cascade Stacking Feature

BayStack 400-ST1 Cascade Modules allow you to connect

up to 8 units into a redundant cascade stack. If any single

unit fails or if a cable is accidently disconnected, other

units in the stack remain operational, without interruption.

Figure 7 shows an example of how a stack configuration

reacts to a failed or powered-down unit in the stack

configuration:

a. As shown in Figure 7, unit 3 becomes

nonoperational.

This can be the result of a failed unit, or simply

because the unit was powered down.

b. Unit 2 and unit 4, directly upstream and

downstream from unit 3, sense the loss of link

signals from unit 3.

c. Unit 2 and unit 4 automatically loop their

internal stack signals (A and B).

The Cas Up LED for unit 2 and the Cas Dwn

LED for unit 4 turn on (yellow) to indicate that

the stack signals are looped.

d. The remaining stack units remain connected.

Although the example shown in Figure 7 shows a failed

unit causing the stack to loop signals at the points of

failure (A and B), the system reacts the same way if a

cable is removed (either deliberately or accidentally).

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Bay BayStack 400-ST1 Manuel d'instructions Page 18