Avaya Definity TN771D Maintenance Test Card (Refurbished)Key Features: 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 TN 771D is required in all standard reliability Primary Port Networks (PPNs) and critical reliability Expansion Port Networks (EPNs).
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Avaya Definity TN771D Maintenance Test Card (Refurbished)