MT8972B

® ISO2-CMOS ST-BUS™ FAMILY MT8971B/72B Digital Subscriber Interface Circuit Digital Network Interface Circuit Features Full duplex transmission over a single twisted pair Selectable 80 or 160 kbit/s line rate Adaptive echo cancellation Up to 3km (8971B) and 4 km (8972B) ISDN compatible (2B+D) data format Transparent modem capability Frame synchronization and clock extraction MITEL ST-BUS compatible Low power (typically 50 mW), single 5V supply ISSUE 7 May 1995 Ordering Information MT8971BE 22 Pin Plastic DIP MT8972BE 22 Pin Plastic DIP MT8972BC 22 Pin Ceramic DIP MT8971BP 28 Pin PLCC MT8972BP 28 Pin PLCC -40°C to + 85°C Description The MT8971B (DSIC) and MT8972B (DNIC) are multi-function devices capable of providing high speed, full duplex digital transmission up to 160 kbit/s over a twisted wire pair. They use adaptive echo-cancelling techniques and transfer data in (2B+D) format compatible to the ISDN basic rate. Several modes of operation allow an easy interface to digital telecommunication networks including use as a high speed limited distance modem with data rates up to 160 kbit/s. Both devices function identically but with the DSIC having a shorter maximum loop reach specification. The generic "DNIC" will be used to reference both devices unless otherwise noted. The MT8971B/72B is fabricated in Mitel’s ISO 2CMOS process. Applications Digital subscriber lines High speed data transmission over twisted wires Digital PABX line cards and tel...