DESCRIPTION The PM7345 S/UNI-PDH is an ATM physical layer processor with integrated DS3 and E3 framing. PLCP sublayer DS1, DS3, E1, and E3 processing is supported as is ATM cell delineation. FEATURES • Implements the ATM Direct Cell Mapping into DS1, DS3, E1, E3 transmission systems according to ITU-T Draft Recommendation G.804. • Implements the Physical Layer Convergence Protocol (PLCP) for DS1 and DS3 transmission systems according to the ATM Forum User Network Interface Specification and ANSI TA-TSY-000773, TA-TSY-000772, and E1 and E3 transmission systems according to the ETSI Draft Standards T/NA(91)17, and T/NA(91)18. • Implements the ATM physical layer for Broadband ISDN according to ITU-T Recommendation I.432. • Provides on-chip DS3 and E3 (G.751 and G.832) framers. • Directly interfaces to available E3/DS3 line interface units. • Uses the PMC-Sierra PM4341 T1XC, PM6341 E1XC, and PM4351 COMET framer/line interface chips for DS1 and E1 applications. • Provides support for an arbitrary rate external transmission system interface up to a maximum rate of 52 Mbit/s. • Support is provided for SMDS and ATM mappings into various rate transmission systems as defined below, as well as supporting the evolving mappings defined in G.804: • Provides an 8-bit microprocessor interface for configuration, control and status monitoring. • Low power CMOS technology. • Available in a high density 100-pin PQFP package, or in an 84-pin PLCC package which is pin-compatible with the PMC-Sierra PM7321 PLPP standard product. APPLICATIONS • ATM or SMDS Routers, Bridges, Switches, and Adapter Cards • DQDB Access Units • ATM and SMDS test equipment
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