The Lucent Technologies Microelectronics Group T7264 U-Interface 2B1Q Transceiver integrated circuit provides full-duplex, basic-rate (2B+D) integrated services digital network (ISDN) communications on a 2-wire digital subscriber loop at either the LT or NT and conforms to the ANSI North American Standard T1.601-1992. The single +5 V CMOS device is packaged in a 44-pin plastic leaded chip carrier (PLCC).