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Common Control Module
CCM Redundancy
Two CCMs of the same model type may be configured as a redundant pair in the same node. One
is in-service and the other is in standby. If a fault occurs in the in-service CCM, the OCM
automatically switches over to the standby CCM, bringing it into service and causing the in-service
CCM to go into standby.
The front panel disable (Disable) switch can be used to perform a redundant switchover manually.
This is a momentary push-button switch. When you push it on the in-service CCM, the standby
LED will light to confirm that the switch was pressed. You must press the switch for at least one
second. Then the in-service CCM goes into standby and the standby CCM goes in-service. The
procedure for removing a CCM (as part of a redundant pair) is provided below:
1. To minimize disruption to the OCM, remove a CCM only when it is in sleep mode:
•
If the CCM is in-service, press front panel disable (Disable) switch for at least one
second. The standby LED lights, and the CCM goes into standby.
•
If the CCM is in standby, press the front panel switch for at least one second. All LEDs
go out. The CCM is now in sleep mode.
2. Extract the CCM within five seconds. If you don't remove the CCM within five seconds, the
CCM automatically restores itself to the standby mode.
CCM Options
The on board options are typically set at the factory to match your network operation. Check these
settings when you first install the unit. You need not repeat the procedure unless you change your
network. The figures listed below show option switches and headers in their normal or default
(factory shipped) positions.
•
Figure 3-1
of the CCM: CCM-6 (OCM-2000 only) and CCM-7 (OCM-1000 only).
•
Figure 3-2
(OCM-1000 or OCM-2000).
1. Examine the module by checking the option switches and/or headers on the modules.
2. For the OCM-7, you must set an address, as listed in
3. When you are satisfied that the option settings are correct, install the CCM modules in the
shelf following the directions below.
3-2
shows the location and function of switches and headers on earlier versions
shows the location and function of switches and headers on the CCM-10
Office Connunications Manager OCM-1000/OCM-2000
Installation & Operation
Table
3-1.
036R340-000
Issue 16
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