The Avaya Definity TN777 Network Controller (TN777) is
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 up 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
Supports ISDN
Fully refurbished
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