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MT9072AB Datasheet(PDF) 50 Page - Zarlink Semiconductor Inc |
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MT9072AB Datasheet(HTML) 50 Page - Zarlink Semiconductor Inc |
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50 / 275 page  MT9072 Data Sheet 50 Zarlink Semiconductor Inc. 5.2.2 E1 CRC-4 Multiframing (Timeslot 0) The primary purpose for CRC-4 multiframing is to provide a verification of the current basic frame alignment, although it can also be used for other functions such as bit error rate estimation. The CRC-4 multiframe consists of 16 basic frames numbered 0 to 15, and has a repetition rate of 16 frames X 125 microseconds/frame = 2 msec. CRC-4 multiframe alignment is based on the 001011 bit sequence, which appears in bit position one of the first six NFASs of a CRC-4 multiframe. The CRC-4 multiframe is divided into two submultiframes, numbered 1 and 2, which are each eight basic frames or 2048 bits in length. The CRC-4 frame alignment verification functions as follows. Initially, the CRC-4 operation must be activated and CRC-4 multiframe alignment must be achieved at both ends of the link. At the local end of a link, all the bits of every transmit submultiframe are passed through a CRC-4 polynomial (multiplied by X4 then divided by X4 + X + 1), which generates a four bit remainder. This remainder is inserted in bit position one of the four FASs of the following submultiframe before it is transmitted (see Table 12). CRC-4 CRC-4 Frame/Type PCM30 Channel Zero 1 2 3 45678 0/FAS C1 0 0 11011 1/NFAS 0 1 A Sa4 Sa5 Sa6 Sa7 Sa8 2/FAS C2 0 0 11011 3/NFAS 0 1 A Sa4 Sa5 Sa6 Sa7 Sa8 4/FAS C3 0 0 11011 5/NFAS 1 1 A Sa4 Sa5 Sa6 Sa7 Sa8 6/FAS C4 0 0 11011 7/NFAS 0 1 A Sa4 Sa5 Sa6 Sa7 Sa8 8/FAS C1 0 0 11011 9/NFAS 1 1 A Sa4 Sa5 Sa6 Sa7 Sa8 10/FAS C2 0 0 11011 11/NFAS 1 1 A Sa4 Sa5 Sa6 Sa7 Sa8 12/FAS C3 0 0 11011 13/NFAS E1 1A Sa4 Sa5 Sa6 Sa7 Sa8 14/FAS C4 0 0 11011 15/NFAS E2 1A Sa4 Sa5 Sa6 Sa7 Sa8 Table 12 - CRC-4 FAS and NFAS Structure (E1) indicates position of CRC-4 multiframe alignment signal. |
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