PM5343

· 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.

The PM5343 SONET/SDH 155 Mbit/s Transport Overhead Terminating Transceiver (STXC) processes the transport overhead (section overhead) of STS-1, and STS-3 (STM-1) streams at 51.84 Mbit/s and 155.52 Mbit/s. The STXC implements significant functions for a SONET/SDH compliant line interface.

The STXC receives SONET/SDH frames via a bit serial or byte serial interface and processes section (regenerator section) and line (multiplexer section) overhead. PM5343 performs framing (A1, A2), descrambling, detects alarm conditions, and monitors section and line path bit interleaved parity (B1, B2), accumulating error counts at each level for performance monitoring purposes. B2 errors are  also monitored to detect signal fail and signal degrade threshold crossing alarms. Line remote error indications (M1) are also accumulated. A 16 or 64 byte section trace (J0) message may be buffered and compared against an expected message.

The STXC also provides convenient access to all transport overhead bytes, which are extracted and serialized on lower rate interfaces, allowing additional external processing of overhead.

The STXC transmits SONET/SDH frames, via a bit serial or a byte serial interface, and formats section and line overhead appropriately. PM5343 performs framing pattern insertion (A1, A2), scrambling, alarm signal insertion, and creates section and line bit interleaved parity (B1, B2) as required to allow performance monitoring at the far end. Line remote error indications (M1) are optionally inserted. A 16 or 64 byte section trace (J0) message may be inserted.

The STXC also provides convenient access to all transport overhead bytes, which are optionally inserted from lower rate serial interfaces, allowing external sourcing of overhead. The STXC also supports the insertion of a large variety of errors into the transmit stream, such as framing pattern errors and bit interleaved parity errors, which are useful for system diagnostics and tester applications. Ring control ports provide the ability to pass control and status information between mate transceivers.

The transmitter and receiver of PM5343 are independently configurable to allow for asymmetric interfaces. The STXC is configured, controlled and monitored via a generic 8-bit microprocessor bus interface.

The STXC is implemented in low power, +5 Volt, CMOS technology. It has TTL and pseudo ECL (PECL) compatible inputs and outputs and is packaged in a 160 pin MQFP package.