MJ1446 Datasheet | Plessey

MJ1446 2 MBIT PCM SIGNALLING CIRCUIT MJ1446 TIME SLOT 16 RECEIVER AND TRANSMITTER The 2.048 Mbit PCM signalling circuits prise a group of circuits which will perform the mon signalling and error detection functions for a 2.048 Mbit 30 channel PCM transmission link operating to the appropriate CCITI remendations. The circuits are fabricated in N-channel metal gate MOS and operate from a single 5volt supply. Relevant inputs and outputs are TIL patible. The MJ1446 has two modes of operation dependent on the state of the mode control input. With the mode control high the device is in the transmit mode and with the mode control low the device is in the receive mode. In the transmit mode the device accepts 64k bits/sec signalling information in either binary or AMI format and outputs it at 2Mbits/sec on to the digital highway during time slot 16. In the receive mode the device accepts 2Mbit/sec information from the digital highway, during time slot 16 and output is at 64kbitslsec in both binary and AMI format. In both receive and transmit mode there is an AMI coded clock output, AMI output and AMI output which conforms to CCITI remendation no G372 for a 64kbits/sec contradirectional interface. The alarm inhibit input causes the 8kHz timing signal to be removed from the AMI clock output. The device is reset in both modes by a time slot 16 channel pulse and the alarm output provides an indication that the internal counter is operating correctly. Also provided are 64kHz, 16kHz and 8kHz clock outputs. Fig.1 Pin connections DG16 Features - SV ±S% Supply-20mA Typical - Conforms to CCITI Remendations - Provides Both AMI and Binary Format Data Outputs - Single Chip Receive or Transmit - All Inputs and Outputs are TIL...