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- Communicates control channel messages between the processor circuit pack and the distributed network of port circuit packs on the TDM bus
- Controls 4 data channels that process and route information directly from the processor circuit pack to customer connected equipment
- Has time of day clock with battery back for power failure or low voltage conditions
- Monitors the status of the system clocks and alerts the processor circuit pack in the event of a failure of any clock
- Also supports ISDN
