DESCRIPTION
The PM5351 S/UNI-TETRA SATURN User Network Interface is a monolithic integrated circuit that implements four channel SONET/SDH processing, ATM mapping and Packet over SONET/SDH mapping functions at the STS-3c (STM-1) 155.52 Mbit/s rate.

FEATURES
General
• Single chip QUAD ATM User-Network Interface operating at 155.52 Mbit/s.
• Implements the ATM Forum User Network Interface Specification and the ATM physical layer for Broadband ISDN according to CCITT Recommendation I.432.
• Implements the Point-to-Point Protocol (PPP) over SONET/SDH specification according to RFC 1619/1662 of the PPP Working Group of the Internet Engineering Task Force (IETF).
• Processes duplex 155.52 Mbit/s STS-3c (STM-1) data streams with on-chip clock and data recovery and clock synthesis.
• Exceeds Bellcore GR-253-CORE jitter tolerance and intrinsic jitter criteria.
• Exceeds Bellcore GR-253-CORE (1995 Issue) jitter transfer and phase variation criteria.
• Provides control circuitry required to exceed Bellcore GR-253-CORE WAN clocking requirements related to wander transfer, holdover and long term stability when using an external VCXO.
• Fully implements the ATM Forum’s Utopia Level 2 Specification with MultiPHY addressing and parity support.
• Implements the POS-PHY 16-bit System Interface for Packet over SONET/SDH (POS) applications. This system interface is similar to Utopia Level 2, but adapted to packet transfer. Both byte-level and packet-level transfer modes are supported.
• Provides a standard 5 signal IEEE 1149.1 JTAG test port for boundary scan board test purposes.
• Provides a generic 8-bit microprocessor bus interface for configuration, control, and status monitoring.
• Low power 3.3V CMOS with PECL and TTL compatible inputs and CMOS/TTL outputs, with 5V tolerance inputs (system side interface is 3.3V only).
• Industrial temperature range (-40°C to +85°C).
• 304 pin Super BGA package.

APPLICATIONS
• WAN and edge ATM switches.
• LAN switches and hubs.
• Packet switches and hubs.
• Layer 3 switches.
• Multiservice switches (FR, ATM, IP, etc..).
• Gigabit and Terabit routers.