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)
|