Fully Integrated T1/E1 Framer and Line Interface

The Bt8370/75/76 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.

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)