Importance

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Abstract

On terminating processing of an STS-N signal into which first through N-th STS-1 signals identified by first through N-th channel numbers are multiplexed, a channel counter counts up from a first value to an N-th value in response to leading bytes of SPE's of the STS-1 signals in the STS-N signal. Responsive to control bytes following the leading bytes in the STS-N signal, the counter repeats the above-mentioned operation and produces a count signal successively representing the first through the N-th values as the first through the N-th channel numbers. A data processor processes the STS-N signal. First through N-th FIFO's correspond to the first through the N-th channel numbers. Responsive to the count signal, a distributor distributes an output of the processor at every one byte to the FIFO's corresponding to the channel numbers represented by the first through N-th values successively indicated by the count signal.

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First Claim