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.

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

Applications
• Digital subscriber lines
• High speed data transmission over twisted wires
• Digital PABX line cards and telephone sets
• 80 or 160 kbit/s single chip modem