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XRT86SH221 Datasheet(PDF) 3 Page - Exar Corporation |
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XRT86SH221 Datasheet(HTML) 3 Page - Exar Corporation |
3 / 353 page PRELIMINARY XRT86SH221 3 REV. P1.0.5 SDH-TO-PDH FRAMER/MAPPER WITH INTEGRATED 21-CHANNEL E1 SH LIU SDH Transmitter • Performs standard STM-0/STM-1 transmit processing. • Conforms to ITU-T I.432, ANSI T1.105, and Bellcore-253 • Provides a 51.84MHz STM-0 serial interface or 6MHz / 19MHz 8-bit STM-0 / STM-1 parallel interface. • Performs SDH frame insertion and accepts external frame synchronization. • Performs optional transmit data scrambling. • Performs POH, SDH OH generation/insertion. • Generates transmit payload pointer (H1, H2) (fixed at 522) with NDF insertion. • Inserts A1/A2 with optional error mask. • Computes and inserts BIP-8 (B1, B2) with optional error mask. • Generates AIS-L, REI-L and RDI-L according to receiver state with option of SW or HW insertion. • Inserts LOS, forces SEF by software. • Generates RDI-P and REI-P automatically with optional SW or HW override. • Inserts fixed-stuff columns, calculates and inserts B3 error code. SDH Receiver • Performs standard STM-0/STM-1 receive processing. • Conforms to ITU-T I.432, ANSI T1.105, and Bellcore-253. • Provides fully programmable threshold detection for SD and SF conditions. • Provides a 51.84MHz STM-0 serial interface or 6MHz / 19MHz 8-bit STM-0 / STM-1 parallel interface. • Provides section trace buffer with mismatch detection and invalid message detection. • Performs SDH frame synchronization. • Supports NDF, positive stuff and negative stuff for pointer processor. • Performs receive data de-scrambling. • Performs POH, SDH OH interpretation/extraction. • Interprets payload pointer (H1, H2). • Detects Out Of Frame (OOF), Loss Of Frame (LOF), Loss Of Signal (LOS), APS failure. • Detects Line Alarm Indication(L-AIS), Line remote Defect Indication (L-RDI), Loss Of Pointer. • Detects Path Alarm Indication, Path remote Defect Indication, Path extended RDI. • Provides signal label monitor with PLM detection. • Supports path trace buffer with TIM-P and invalid message detection. • Computes and compares B3, REI-L and REI-P errors. • Computes and compares BIP-8 (B1, B2) and counts the errors. |
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