FEATURES
• Monolithic SONET/SDH Transport Overhead Terminating Transceiver for use
   in STS-1, STS-3 or STM-1 interface applications, operating at serial interface
   speeds of up to 155.52 Mbit/s.
• Provides termination for SONET Section and Line, and SDH Regenerator
   Section and Multiplexer Section transport overhead.
• Companion to the PM5344 SPTX SONET/SDH Path Terminating Transceiver.
• Operates in STS-1 and STS-3 bit-serial (PECL/TTL I/O) and byte-serial (TTL
   I/O) modes. Provides independent control of the transmit and receive
   operating modes for asymmetrical bandwidth applications.
• Frames to the STS-1 or STS-3 (STM-1) receive stream and inserts the
   framing bytes (A1, A2) and the STS identification bytes (J0) into the transmit
   stream; Descrambles the receive stream and scrambles the transmit stream.
• Calculates and compares the bit interleaved parity error detection codes (B1,
   B2) for the receive stream and calculates and inserts B1 and B2 in the
   transmit stream.
• Accumulates near end errors (B1, B2) and far end errors (M1) and inserts
   line remote error indications (REI) into the Z2 growth byte based on received
   B2 errors.
• Detects signal degrade (SD) and signal fail (SF) threshold crossing alarms
   based on received B2 errors.
• Optionally inserts the line BIP-8 error detection code into each of the
   constituent STS-1s (B2 bytes) of the transmit STS-1/3 stream.
• Extracts and serializes the order wire channels (E1, E2), the data
   communication channels (D1-D3, D4-D12) and the section user channel (F1)
   from the receive stream, and inserts the corresponding signals into the
   transmit stream.
• Extracts and serializes the automatic protection switch (APS) channel (K1,
   K2) bytes, filtering and extracting them into internal registers. Inserts the APS
   channel into the transmit stream.
• Detects loss of signal (LOS), out of frame (OOF), loss of frame (LOF), line
   remote defect indication (RDI), line alarm indication signal (AIS), and
   protection switching byte failure alarms.
• Inserts and extracts a 64 byte or 16 byte section trace (J0) message using an
   internal register bank. Detects an unstable section trace message or
   mismatch with an expected message, and inserts Line AIS upon either of
   these conditions.
• Inserts RDI and AIS in the transmit stream.
• Provides loss of signal insertion, framing pattern error insertion, and coding
   violation insertion (B1 and B2) for diagnostic purposes. B1 and B2 errors can
   also be generated "on-the-fly" using an error insertion mask.
• Provides a transmit and receive ring control port, allowing alarm and
   maintenance signal control and status to be passed between mate STXCs for
   ring-based add drop multiplexer applications.
• Low power +5 Volt 0.8 micron CMOS. Device has PECL and TTL compatible
   inputs and outputs.
• 160 pin copper leadframe MQFP package. Supports Industrial Temperature
   Range (-40°C to 85°C) operation.

APPLICATIONS
• OC-N Regenerators
• OC-N to OC-M multiplexers
• SONET/SDH add drop multiplexers
• SONET/SDH terminal multiplexers
• Broadband ISDN user network interfaces
• SONET/SDH test equipment