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