Patent ID: 9438365
Filing Date: 2016-09-06
CPC Classification: H04J,H04Q

Claim Text:
1. A client signal mapping circuit for accommodating a client signal in a transmission frame signal, comprising: an asynchronous buffer unit configured to temporarily store the client signal; a frequency information generation unit configured to generate frequency information from a clock of the client signal and a clock of a transmission frame signal; a random signal superimposing unit configured to superimpose a random signal sequence on the frequency information generated by the frequency information generation unit; a reading control unit configured to control reading of the client signal from the asynchronous buffer unit based on the clock of the client signal and the frequency information; an overhead insertion unit configured to insert an overhead of a transmission frame signal into a data sequence read from the asynchronous buffer unit; and a selector unit configured to select one of frequency information on which the random signal sequence is superimposed and frequency information on which the random sequence is not superimposed.