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Request a Quote TN771DP Avaya TN771DP - Maintenance / Test Circuit Pack The TN771DP performs maintenance functions for Definity. Functions include Packet Bus reconfiguration that allows diagnosis and correction of recoverable Packet Bus failures before Link Access Procedure on the D-Channel (LAPD) links fail - ISDN - PRI testing that originates and terminates loopback tests on ISDN facilities. The TN771DP is required in all standard reliability Primary Port Networks (PPNs) and critical reliability Expansion Port Networks (EPNs). All standard reliability PPNs when packet endpoints (BRI and/or ASAI) are supported. The TN771DP circuit pack can be updated using the firmware download feature, which requires use of the TN799 C-LAN circuit pack interface. Avaya TN771DP - Maintenance / Test Circuit Pack