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Request a Quote TN556 Avaya TN556 ISDN BRI Interface The Avaya TN556 ISDN BRI Interface has 12 Ports connecting to ISDN-BRI terminals. Up to 8 ports can be used for adjunct switch application interface (ASAI) links. Each port operates at 192 kbps and has two B-channels and one D-channel. Has multipoint support - 24 terminals can be connected where each terminal uses one B-channel and shares the D-channel. Avaya TN556 ISDN BRI Interface