Description
The MT8930B Subscriber Network Interface Circuit (SNIC) implements the CCITT I.430 and ANSI T1.605 Recommendations for the ISDN S and T reference points. Providing point-to-point and pointto-multipoint digital transmission, the SNIC may be used at either end of the subscriber line (NT or TE).

Features
• CCITT I.430 and ANSI T1.605 S/T interface
• Full-duplex 2B+D, 192 kbit/s transmission
• Link activation/deactivation
• D-channel access contention resolution
• Point-to-point, point-to-multipoint and star configurations
• Master (NT)/Slave (TE) modes of operation
• Exceeds loop length requirements
• Complete loopback testing capabilities
• On chip HDLC D-channel protocoller
• 8 bit Motorola/Intel microprocessor interface
• Controllerless or microprocessor-controlled operation
• Mitel ST-BUS interface
• Low power CMOS technology
• Single 5 volt power supply

Applications
• ISDN NT1
• ISDN S or T interface
• ISDN Terminal Adaptor (TA)
• Digital sets (TE1) - 4 wire ISDN interface
• Digital PABXs, Digital Line Cards (NT2)