Fujitsu Corporation

Masashi Ohba

Toshiaki Hayashi

Hiroshi Nakaide

Satoshi Takeda

Shinzi Hiyama

At a CRC transmission side of a cross connect equipment, a CRC operation is applied to received channel data of each channel independently and sequentially in every sub frame having the same number of channels, series of which sub frames set up a main frame. The resultant CRC code of each channel obtained in a preceding sub frame is coupled to the received channel data of the corresponding channel to apply the same CRC operation to the thus received channel data, thereby the accumulated result of each channel is added in the last sub frame. At a CRC reception side, a cyclic CRC operation similar to that achieved at the CRC transmission side is applied to an outgoing channel data provided with the resultant CRC codes for each channel to obtain CRC results. During the cyclic CRC operation, a CRC error that once occurs is held during the main frame.

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Kawasaki, Japan

Masashi Ohba