Avaya Definity TN556D ISDN BRI 4-Wire Circuit Pack

TN556D ISDN BRI 4-WIre Interface Provides 12-ports connecting to ISDN-BRI terminals. Each port uses TXT, TXR, PXT, PXR signal leads and ranges up to 3300 feet maximum from the system to the voice terminal. Features Ports connection to ISDN-BRI terminals: 12 Signal leads: TXT, TXR, PXT, and PXR Up to 8 ports can be used for ASAI links 2 B-channels 1 D-channel Range up to 3300 ft. Compatible with Definity R7 or late Requires a packet control circuit pack (TN778) if using R6si systems Includes Atlas 1-Year Warranty with Extended Warranty options available! Package Includes TN556D ISDN BRI 4-WIre Interface