Alarms In And Alarms Out Connectors - Cisco Prisma II Installation Manual

Chapter 2 Module Installation

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:
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.
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