| TN556B ISDN-BRI 4-Wire Interface |
 TN556B ISDN BRI 4-Wire Interface Like New: Quantity This product is eligible for 2 Year Platinum Protection! TN556B Features 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 Price: 29.99 |