Description
The MT9075B is a single chip device which integrates an advanced PCM 30 framer with a Line Interface Unit (LIU). The framer interfaces to a 2.048 Mbit/s backplane and provides selectable rate data link access with
optional HDLC controllers for Sa bits and channel 16. The LIU interfaces the framer functions to the PCM
30 transformer-isolated four wire line.

FEATUREs
• Combined PCM 30 framer, Line Interface Unit (LIU) and link controllers in a 68 pin PLCC or 100 pin MQFP package
• Selectable bit rate data link access with optional Sa bits HDLC controller (HDLC0) and channel 16 HDLC controller (HDLC1)
• LIU dynamic range of 20 dB
• Enhanced performance monitoring and programmable error insertion functions
• Low jitter DPLL for clock generation
• Operating under synchronized or free run mode
• Two-frame receive elastic buffer with controlled slip direction indication
• Selectable transmit or receive jitter attenuator
• Intel or Motorola non-multiplexed parallel microprocessor interface
• CRC-4 updating algorithm for intermediate path points of a message-based data link application
• ST-BUS/GCI 2.048 Mbit/s backplane bus for both data and signalling

APPLICATIONs
• E1 add/drop multiplexers and channel banks
• CO and PBX equipment interfaces
• Primary Rate ISDN nodes
• Digital Cross-connect Systems (DCS)