The ADTRAN Total Access U-BR1TE is a line card that plugs into a single channel slot of a Total Access 750, 850 or 1500 platforms. It provides an ISDN U-interface and allows the transport of Basic Rate 2B+D information over T1carriers and twisted pair wiring. Clear channel capability (B8ZS) is not required of the T1 facility if zero byte substitution is enabled. Block error rate performance over the T1 facility is monitored and is available over the network.

The ADTRAN U-BR1TE provides ISDN range extension 18,000 feet nominal range on mixed gauge wire. An internal test pattern allows for testing of individual B Channels with out the need of external test equipment. A distinctive metallic DC test signature identifies either line unit LT or line unit NT mode of operation. Loopback capability for full 2B+D as well as individual B channels in both loop and carrier directions is provided. Individual B channel loopbacks can be initiated via the DB-9 VT 100 craft interface on the Total Access 750/850 BCU or the Total Access 1500 SCU, or from a remote location through the maintenance channel. B1 and B2 loopback addressability is available at the faceplate for the NT1 and up to six devices in the Network-to-Customer direction. A built in Cyclic Redundancy Check clock error detector provides for local performance.

• 18,000 feet nominal range on mixed gauge wire
• ISDN 2B1Q interface Ð meets all Layer 1 requirements as specified in ANSI T1.601-1991
• Internal test pattern allows for testing of individual B Channels without external test equipment
• Performance monitoring
• Distinctive metallic DC test signature to identify either line unit LT or NT mode of operation
• Provides loopback capability for full 2B+D as well as individual B channels in both loop and carrier directions
• Built in Cyclic Redundancy Check (crc) clock error detector
• DS0-logic level transmit and receive data access through faceplate bantam jacks
• Addressing and error status with front panel LED indicators