Single V.35 DTE interface Nx56 or Nx64 operation for data rates to 1.536 Mbps Auto and Manual D4(SF) or ESF framing support B8ZS or AMI line coding Easy-to-use front-panel keypad for unit configuration and monitoring Remote TSU configuration via FDL or 8k in-band Local and remote loopback capability Extensive built-in test capabilities Support for T-Watch PRO software for optional PC-based configuration Standard 5-year warranty