Cisco Prisma II HD-LRMW, Installation And Operation Manual

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External Alarm Connections
33
External Alarm Connections
Master/Slave Operation
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.
ALARMS IN and ALARMS 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:
¾
Any device configured as Single or Master ignores its ALARM IN contacts.
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To verify proper wiring and redundant configuration, simply unplug the Master
module and observe that the Slave module turns on.