External Alarms Connections; Master/Slave Operation; Alarms In And Alarms Out Connectors - Cisco Prisma II 1550 nm Installation And Operation Manual

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External Alarms Connections

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

software, 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.

78-4019959-01 Rev D

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