Compact device for carrying out terminating processing of STS-N signal

A terminating device for carrying out a terminating processing of an STS-N signal which is a multiplexed signal given by synchronously time division multiplexing first through N-th STS-1 signals at every one byte, where N represents a predetermined integer greater than one, said first through said N-th STS-1 signals being identified by first through N-th channel numbers, respectively, each of said first through said N-th STS-1 signals comprising a synchronous payload envelope comprising a leading byte representative of predetermined data and a predetermined plural number J of control bytes following said leading byte and representing control information data used in said device in carrying out said terminating processing, said device comprising:

• a clock pulse generator supplied with said STS-N signal for successively generating clock pulses in byte synchronism with the leading bytes of the synchronous payload envelopes of said first through said N-th STS-1 signals and the control bytes of the synchronous payload envelopes of said first through said N-th STS-1 signals;
• a leading byte indication signal generator supplied with said STS-N signal for generating a leading byte indication signal for collectively indicating said leading bytes of the synchronous payload envelopes or said first through said N-th STS-1 signals by detecting said predetermined data of the leading bytes of the synchronous payload envelopes of said first through said N-th STS-1 signals from said STS-N signal;
• a channel counter connected to said clock pulse generator and said leading byte indication signal generator for carrying out a counting operation of counting up a count from a first counted value to an N-th counted value in response to the clock pulses received while said channel counter receives said leading byte indication signal, said channel counter repeatedly carrying out said counting operation of counting up said count from said first counted value to said N-th counted value in response to the clock pulses received when said channel counter does not receive said leading byte indication signal, said channel counter repeatedly producing a channel count signal successively representing, as said first through said N-th channel numbers, said first through said N-th counted values which are counted in response to the clock pulses received when said channel counter does not receive said leading byte indication signal;
• a data processor supplied with said STS-N signal and connected to said clock pulse counter and said leading byte indication signal generator for successively producing the control bytes of the synchronous payload envelopes of said first through said N-th STS-1 signals in response to the clock pulses received when said data processor does not receive said leading byte indication signal;
• first through N-th first-in first-out memories which are in one-to-one correspondence to said first through said N-th channel numbers;
• and
• a distributor connected to said data processor and said first through said N-th first-in first-out memories for repeatedly carrying out, in response to said channel count signal repeatedly produced by said channel counter, a distributing operation of distributing the control bytes of the synchronous payload envelopes of said first through said N-th STS-1 signals at every one byte to the first through the N-th first-in first-out memories corresponding to said first through said N-th channel numbers successively represented by said channel count signal, said distributor thereby making said first through said N-th first-in first-out memories memorize the control bytes of the synchronous payload envelopes of said first through said N-th STS-1 signals as first through N-th memorized data signals of said first through said N-th STS-1 signals, respectively.