The XR-T6166 is a CMOS device which contains the digital circuitry necessary to interface both directions of a 64kbps data stream to 2.048Mbps transmit and receive PCM time-slots. The XR-T6166 and the companion XR-T6164 line interface chip together form a CCITT G.703 compliant 64kbps codirectional interface. The XR-T6166 contains separate transmit and receive sections. The transmitter transforms 8 bit serial data from a 2.048Mbps time-slot into an encoded 64kbps data ORDERING INFORMATION