PM5312

· Monolithic SONET/SDH Transport Overhead Terminating Transceiver for use in STS-1, STS-3 (STM-1), or STS-12 (STM-4) line interface applications.
· Operates in one of four modes: STS-1 bit serial mode, STS-1 byte serial mode, STS-3/STM-1 byte serial mode, or STS-12/STM-4 byte serial mode.
· Provides independent control of the transmit and receive operating modes.
· Performs byte interleaved multiplexing of lower rate drop side SONET/SDH data streams. STS-3 to STS-1, STM-4 to STM-1 and STS-12 to STS-3 multiplexing modes are supported.
· Processes byte serial data at 6.48 Mbyte/s, 19.44 Mbyte/s or 77.76 Mbyte/s depending on the mode selected.
· Frames to the receive stream by monitoring the status of the upstream pattern detector provided by available Serial to Parallel / Parallel to Serial front end devices.
· Optionally inserts the framing bytes (A1, A2) and the STS identification bytes (C1) into the transmit stream.
· Optionally descrambles the receive STS-1, STS-3/STM-1 or STS-12/STM-4 stream. Optionally scrambles the transmit STS-1, STS-3/STM-1 or STS-12/STM-4 stream.
· Calculates and compares the bit interleaved parity error detection codes (B1, B2) for the receive stream. Calculates and inserts B1 and B2 in the transmit stream.
· Optionally inserts line far end block errors (FEBE) into the Z2 growth byte based on received B2 errors.
· Accumulates near end errors (B1, B2) and far end errors (Z2) for performance monitoring purposes.
· Extracts the order wire channels (E1, E2) of the receive stream and serializes them at 64 kbit/s. Optionally inserts the order wire channels into the transmit stream.
· Extracts the data communication channels (D1-D3, D4-D12) and serializes them at 192 kbit/s (D1-D3) and 576 kbit/s (D4-D12). Optionally inserts the data communication channels into the transmit stream.
· Extracts the section user channel (F1) and serializes it at 64 kbit/s. Optionally inserts the section user channel into the transmit stream.
· Extracts the automatic protection switch (APS) channel (K1, K2) and serializes it at 128 kbit/s. Detects loss of signal (LOS), out of frame (OOF), loss of frame (LOF), far end receive failure (FERF), line alarm indication signal (AIS), and protection switching byte failure alarms.
· Inserts FERF 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. Provides a transmit and receive ring control port, allowing alarm and maintenance signal control and status to be passed between mate STTXs for applications in ring-based add drop multiplexers.
· Low power +5 Volt 0.8 micron CMOS with TTL/CMOS compatible inputs and outputs.
· 208 pin copper slugged PQFP package.

The PM5312 STTX SONET/SDH Transport Overhead Terminating Transceiver processes the transport overhead (regenerator and multiplexer section overhead) of STS-1, STS-3/STM-1, and STS-12/STM-4 streams and optionally provides byte interleaved multiplexing of lower rate streams.

The PM5312 STTX may be used on the line side of four PM5344 SPTX SONET/SDH Path Terminating Transceiver devices to implement a full SONET/SDH path transmission system capable of terminating 12 STS-1 or four STS-3/STM-1 channels.

In a similar fashion, the PM5312 STTX may be used on the line side of four PM5345 SUNI Saturn User Network Interface devices to implement an Asynchronous Transfer Mode (ATM) Multiplexer which takes four logical ATM streams operating at 155 Mbit/s and synchronously multiplexes them into a single 622 Mbit/s stream.