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Avaya Definity TN556D ISDN-BRI 4-Wire S/T-NT Interface (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) links
- Each port operates at 192 kbps per second and has 2 B-channels and 1 D-channel
- Requires a packet control circuit pack (TN778) when used in R6si systems or packet bus-equipped R6vs systems
- Range of up to 3300 ft. maximum from the system to the voice terminal
- 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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