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Circuit Pack Descriptions
7-4
Issue 1
December 1997
Control
7
The control system controls and reports the status of the transmission signal
through the DDM-2000 OC-12 Multiplexer. All system features are implemented or
supported through the control system. However, transmission is unaffected by
control system failure. If a controller does fail, protection switches are not done.
Therefore, if there is another circuit pack failure requiring a protection switch along
with the controller failure, service may be affected depending on the function of
the failed pack. The control system continuously monitors the equipment to
determine if a protection switch is necessary and to provide equipment
performance information.
The control system in each shelf in a subnetwork can communicate with the
control system of other shelves in that subnetwork via the synchronous optical
network (SONET) section data communications channel (DCC). This allows a
user at one point in the subnetwork to control the shelves throughout the network.
All system features are implemented or supported through the control system.
Control Circuit Packs
7
There are two control circuit packs, the BBG8/BBG8B SYSCTL and the BCP4
OHCTL. Both the SYSCTL and OHCTL are required for all applications.
