FEATURES • 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. APPLICATIONS • OC-N to OC-M multiplexers • SONET/SDH add drop multiplexers • SONET/SDH terminal multiplexers • Broadband ISDN user network interfaces • ATM Transmission systems • SONET/SDH test equipment
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