Avaya TN 777

• 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

Definity TN-777

Definity TN777 Network Controller (TN777) - 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.