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)