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XRT94L43A Datasheet(PDF) 6 Page - Exar Corporation |
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XRT94L43A Datasheet(HTML) 6 Page - Exar Corporation |
6 / 328 page XRT94L43 6 REV. 1.0.2 SONET/SDH OC-12 TO 12XDS3/E3 MAPPER • Provides 15-bit PRBS lock DS3 TRANSMIT FRAMER • Offers following frame generation mechanism: Asynchronous operation, using receive side clock, external framing • Supports either C-bit operation or M13 operation: optional all C bits set to "1" or C-bit parity ID bit (C11) toggled in each frame for M13 operation • Provides start of frame control with external pin • Inserts frame overhead bits via External serial port or Internal generation • Generates and checks parity • Automatically transmits the DS3 FERF/REI indicator whenever the DS3 Receiver declares either the DS3 LOS, DS3 AIS or DS3 OOF defect conditions. • Permits the user to control the DS3 FEBE/REI bit-fields via Software Control, or to automatically transmit the FEBE/REI indicator whenever the DS3 Receiver detects CP-Bit or Framing (F or M) bit errors • Provides FEAC channel processing including generation of valid FEAC patterns and transmissions of all 1’s upon programming of idle code • Inserts path maintenance data link through HDLC transmitter which contains the following features: AM for storage of entire LAPD message Selection of message length to 82 or 76 bytes Optional frame header generation Generation of flag sequences Computation and insertion of CRC Zero stuffing Register bits for communication with microprocessor Interrupt generation upon transmission of message • LOS Insertion enabled by register bit • AIS Insertion enabled by register bit or pin • Idle signal insertion enabled by register bit • Supports B3ZS encoding • Generates AIS, Idle and Yellow force alarms • Inserts errors optionally in the P, F, FEBE and M bits • Provides 15-bit PRBS generator E3 RECEIVE FRAMER • Offers off-line framing algorithm • Complies with standards as: ITU-T G.751 and G.832 • Provides line code violation detection and excess zero count • LAPD controller complies with ITU Q.921 LAPD protocol • Provides local loop-back • Supports G.751 and G.832 framing formats • Supports HDB3 line decoding which can be user enabled. Replaces valid B00V or 000V with 4 zero’s |
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