FEATURES
• A configurable, multi-channel, payload processor for alignment of SONET Virtual Tributaries (VTs) or SDH Tributary Units (TUs). Configurable to process any legal mix of tributaries.
• Provides independently-configurable AU3/AU4 frame format on incoming and outgoing directions.
• Compensates for pleisiochronous relationships between incoming and outgoing higher level (STS-1, AU4, AU3) synchronous payload envelope frame rates through processing of the lower level (VT6, VT3, VT2, VT1.5, TU3, TU2, TU12, or TU11) tributary pointers.
• Provides for multiframe synchronization or ring closure at the head-end node in a SONET/SDH ring.
• Optionally frames to the H4 byte in the Path overhead to determine tributary multiframe boundaries.
• Inserts valid pointers, and all-zeros transport overhead bytes on the outgoing stream with valid “Telecombus” control signals when configured to operate in locked mode.
• Independently-configurable incoming and outgoing interfaces that operate in byte-interface mode using a 19.44 MHz clock or in nibble-interface mode using a 38.88 MHz clock.
• Provides a generic 8-bit microprocessor bus interface and a standard 5-signal IEEE P1149.1 JTAG test port.
• Low power, +5 V, CMOS technology, TTL-compatible inputs and outputs.
• Available in a 160-pin Plastic Quad Flat Pack (PQFP) package (28 by 28 mm).

APPLICATIONS
• SONET/SDH Add/Drop and Terminal Multiplexers
• SONET/SDH Broadband CrossConnects
• SONET/SDH and ATM Test Equipment