MT8979

® ISO-CMOS ST-BUS™ FAMILY MT8979 CEPT PCM 30/CRC-4 Framer & Interface Features Single chip primary rate 2048 kbit/s CEPT transceiver with CRC-4 option Meets CCITT Recommendation G.704 Selectable HDB3 or AMI line code Tx and Rx frame and multiframe synchronization signals Two frame elastic buffer with 32 µ sec jitter buffer Frame alignment and CRC error counters Insertion and detection of A, B, C, D signalling bits with optional debounce On-chip attenuation ROM with option for ADI codecs Per channel, overall and remote loop around ST-BUS compatible ISSUE 7 May 1995 Ordering Information MT8979AC 28 Pin Ceramic DIP MT8979AE 28 Pin Plastic DIP MT8979AP 44 Pin PLCC -40° to 85°C Description The MT8979 is a single chip CEPT digital trunk transceiver that meets the requirements of CCITT Recommendation G.704 for digital multiplex equipment. The MT8979 is fabricated in Mitel’s low power ISO-CMOS technology. Applications Primary rate ISDN network nodes Multiplexing equipment Private network: PBX to PBX links High speed computer to computer links TxMF C2i F0i RxMF DSTi DSTo ADI CSTi0 CSTi1 CSTo VDD ST-BUS Timing Circuitry Digital Attenuator ROM 2 Frame Elastic Buffer with Slip Control CEPT Link Interface RxD RxA RxB TxA TxB PCM/Data Interface Remote & Digital Loopbacks Serial Control Interface ABCD Bit RAM Phase Detector XCtl XSt Control Logic CEPT Counter E2i E8Ko VSS Figure 1 - Functional Block Diagram 4-161 MT8979 ISO-CMOS 28 PIN CERDIP/...