Fully Integrated T1/E1 Framer and Line Interface

The Bt8370/8375/8376 is a family of single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces, operating at 1.544 Mbps or 2.048 Mbps. These devices combine a sophisticated framer, transmit and receive slip buffers, and an on-chip physical line interface to provide a complete T1/E1 transceiver.

The fully featured Bt8370 and short-haul Bt8375 and Bt8376 devices provide a programmable clock rate adapter for simplifying system bus interfacing. The adapter synthesizes standard clock signals from the receive or transmit line rate clocks or from an external reference

Distinguishing Features

• Single-chip T1/E1 framer with short/long-haul physical line interface

• Frames to popular T1/E1 standards:

– T1: SF, ESF, SLC 96, T1DM

– E1: PCM-30, G.704, G.706, G.732 ISDN primary rate

• On-chip physical line interface compatible with:

– DSX-1/E1 short-haul signals

– DS-1 (T1.403) and ETSI long-haul signals

• Two-frame transmit and receive PCM slip buffers

• Clock rate adapter synthesizes jitter

attenuated system clocks from an internal or external reference

• Parallel 8-bit microprocessor port supports Intel or Motorola buses

• Automated Facility Data Link (FDL) management

• BERT generation and counting

• Two full-duplex HDLC controllers for data link and LAPD/SS7 signaling

• B8ZS/HDB3/Bit 7 zero suppression

• 80-pin MQFP surface-mount package

• Operates from a single +5 Vdc ±5 power supply

• Low-power CMOS technology

Applications

• T1/E1 Channel Service Unit/Data Service Unit (CSU/DSU)

• Digital Access Cross-Connect Systems (DACS)

• T1/E1 Multiplexer (MUX)

• PBXs and PCM channel bank

• T1/E1 HDSL terminal unit

• ISDN Primary Rate Access (PRA)