Cisco Cisco Prisma II EDR Receiver 安装指南
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Installation
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Alarm I/O Connections,
Continued
Wiring Alarm Contacts for External Redundancy
When a critical alarm occurs in the master optical receiver, the master is disabled
and the redundant optical receiver is enabled. If the redundant optical receiver is
external (not in the same processor module as the master), the contacts from the
master optical receiver’s pin on the ALARMS OUT connector must be wired to the
contacts at the redundant optical receiver’s pin on the ALARMS IN connector of the
chassis containing the redundant optical receiver. See the previous pages for pin
locations.
Important: For external redundancy to function, the connection described above
Important: For external redundancy to function, the connection described above
must be made when the redundant optical receiver is:
•
•
In the same chassis (but a different processor) as the master.
•
In a different chassis from the master.
Once the contacts are wired, care must be taken to ensure that the master and
redundant optical receivers do not change slots. Otherwise, the ALARMS IN and
ALARMS OUT connectors will need to be rewired.
Notes:
•
Notes:
•
Any device configured as a master ignores its ALARMS IN contacts.
•
To verify proper wiring and configuration, simply unplug the master device and
make sure the redundant optical receiver turns on.