TN722B
The TN722 and TN722B provide interface capability to a DS1 facility. Three types of digital tie trunk interface can be provided: Voice Grade DS1, Alternate Voice/Data (AVD) DS1 tie trunks, and Digital Multiplexed Interface (DMI). The interface provides 2-pair (send and receive) full-duplex circuitry operating at 1.544 Mbps in each direction. Twenty-four independent trunks are available for Voice Grade Service. For AVD or DMI service, the circuit pack provides twenty-three trunks with one truck being provided for signaling. Each trunk can provide 64 Kbps data transmission. The TN722 does not support DMI. The data transmission formats are specified by the DMI. The circuit can also provide bit-oriented signaling on a per-trunk basis for automatic, immediate-start, delay-dial, or release-link trunks. The following lead appearances are provided for the circuit pack: LBACK2, LBACK1, LO, LO (high), LI, LI (high).
