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Avaya Definity TN556D ISDN Line Card

Avaya Definity TN556D ISDN Line Card

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  • Model: TN556D
  • 2 Units in Stock
  • Manufactured by: Avaya


Refurbished Avaya Definity TN556D ISDN Line Card.

Avaya Definity TN556D ISDN2 BRI 4-Wire Interface card (12 ports)

Provides 12-Ports connecting to ISDN-BRI terminals

Each port has TXT, TXR, PXT, and PXR signal leads

Up to 8 ports can be used for adjunct switch application interface (ASAI)

Each port operates at 192 kbps per second and has 2 B-channels and 1

Requires a packet control circuit pack (TN778) when used in R6si systems or
packet bus-equipped R6vs systems

Can connect 24 terminals where each terminal uses 1 B-channel and shares the D-channel

Compatible with Definity R7 or later


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