MH89790B

® ST-BUS™ FAMILY MH89790B CEPT PCM 30/CRC-4 Framer & Interface Preliminary Information Features Complete primary rate 2048 kbit/s CEPT transceiver with CRC-4 option Selectable HDB3 or AMI line code Two frame elastic buffer with 32µ s jitter buffer Tx and Rx frame and multiframe synchroniza-tion signals Frame alignment and CRC error counters Insertion and detection of A, B, C, D signalling bits with optional debounce Line driver and receiver Per channel, overall, and remote loop around Digital phase detector between E1 line and ST-BUS ST-BUS compatible Pin compatible with the MH89790 Inductorless clock recovery Loss of Signal (LOS) indication Available in standard, narrow and surface mount formats Supports single supply rail operation MH89790B MH89790BN MH89790BS ISSUE 5 May 1995 Ordering Information 40 Pin DIL Hybrid 1.3” row pitch 40 Pin DIL Hybrid 0.8“ row pitch 40 Pin Surface Mount Hybrid 0°C to 70°C Description The MH89790B is Mitel’s CEPT PCM 30 interface solution, designed to meet the latest CCITT standards PCM 30 format with CRC-4. The MH89790B provides a complete interface between a 2.048 Mbit/sec digital trunk and Mitel’s Serial Telecom Bus, the ST-BUS. The MH89790B is a pin-compatible enhancement of the MH89790, permitting the removal of the tuneable inductor and inclusion of the external NAND gate used for generating RxD. Applications Primary rate ISDN network nodes Multiplexing equipment Private network: PBX to PBX links...