External Alarm Connections; Master/Slave Operation; Alarms In And Alarms Out Connectors - Cisco Prisma II HD-LRMW Installation And Operation Manual

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External Alarm Connections

All Prisma II modules ship from the factory configured as a master. The LCI,

or the ICIM can be used to reconfigure a module as a slave or as redundant.

The Prisma II Chassis allows for local hard-wired redundancy by using the

ALARM IN and ALARM OUT connectors located on the connector interface

panel. A pair of modules can be configured so that if the master fails, the

slave takes over by using the ALARM IN and ALARM OUT connectors.

Every Prisma II standard and Prisma II XD chassis provides connectors for

external alarms to and from each module slot. These alarm connectors are

located on the chassis connector panel and are labeled ALARMS IN and

ALARMS OUT.

For detailed information on ALARM IN and ALARM OUT connectors, see

the Prisma II Chassis Installation and Operation Guide, part number 713375 or

the Prisma II™ XD Platform System Guide, part number 4021339.

When a critical alarm occurs in a Master module, the Master turns off and the

Slave (redundant module) is enabled. To make this happen, the pin

representing the Master module slot in the ALARM OUT connector must be

externally wired to the pin representing the Slave module slot in the ALARM

IN connector. After wiring these contacts, take care to ensure that the Master

and Slave modules are not moved to other slots. Otherwise, the ALARM IN

and ALARM OUT connectors will need to be rewired to the appropriate

pins.

Note:

Any device configured as Single or Master ignores its ALARM IN contacts.

To verify proper wiring and redundant configuration, simply unplug the Master

module and observe that the Slave module turns on.

External Alarm Connections

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