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August 4, 1987

AT&T HAS TWO NEW ISDN CHIPS

By CBR Staff Writer

AT&T Co this week added two more parts to its growing list of Unite Integrated Services Digital Network chips. AT&T claims that the T7112 Asynchronous Receiver/Transmitter Interface is the only asynchronous communications interface that automatically performs speedmatching on-chip. Speedmatching detects the speed of incoming data and sends that information to the microprocessor, and the ARTI adjusts to the appropriate speed and notifies the microprocessor that the change has been made. Running at 8MHz, the ARTI can transmit and receive data at rates of 250 to 250,000bps, and is compatible with the bus protocol and timing specs of the 16MHz 8051microcontroller and 8MHz 8088 chip. It costs $10 for 1,000-up and is sampling now, volume this quarter. The LC1046 Pulse Code Modulation Transceiver is a fully integrated digital signalling interface for terminal makers, PABX, T1 modem and multiplexer and local net makers. It is $26 for 1,000 up, volume now.

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