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)