PM4344 Datasheet | PMC

FEATURES - Monolithic single-chip device that integrates four full-featured T1 framers and transmitters for terminating duplex DS1 signals. - Supports SF, ESF, T1DM (DDS), and SLC®96 format DS1 signals. - Supports unframed mode. Supports B8ZS or AMI line codes. - Supports transfer of PCM and signalling data to/from 1.544 Mbit/s, 2.048 Mbit/s, 12.352 Mbit/s, or 16.384 Mbit/s backplane buses. - Supports n x DS0 backplane interface for fractional T1. - Provides robbed-bit signalling extraction/insertion, programmable idle and digital milliwatt code substitution, and two superframes of signalling debounce on a per-channel basis. - Provides trunk conditioning which forces programmable trouble code substitution and signalling conditioning on all/selected channels. - Provides ESF bit-oriented code detection/generation, and an HDLC interface for terminating/generating the ESF data link. - Software and functionally patible with the PM4341A T1XC Single T1 Transceiver. Pin-patible with the PM6344 EQUAD Quad E1 Framer. - Provides an 8-bit microprocessor bus interface for configuration, control, and status monitoring. - Low power 5 V CMOS technology. - Available in a rectangular 128-pin PQFP (14 by 20 mm) package. TRANSMIT SECTION - Optionally accepts/provides dual-rail digital PCM inputs/outputs. - Provides per-channel minimum ones density through Bell (bit 7), GTE, DDS, or “jammed bit 8" (56 Kbit/s) zero code suppression. - Detects violations of the ANSI T1.403 12.5% pulse density rule over a moving 192-bit window. - Allows insertion of framed or unframed in-band loopback code sequences. - Allows insertion of a data link in ESF, T1DM (DDS) or SLC®96 modes. APPLICATIONS - T1/T3 Multiplexers and Digital Private Branch Exchanges (PBXs) - T1 Frame Relay Interfaces - T1 ATM Interfaces - Fractional T1 Interfaces - Digital Access and Cross-Connect Systems (DACS) and Electronic DSX Cross-Connect Systems (EDSXs) - Digital Loop Carriers (DLCs) - T1 Channel Service Units (CSUs) and...