Destuffing control by modifying detected pointer with differential value

Abstract From the Canadian patent

In a digital communication system where a received stuff-synchronized TDM signal is demultiplexed into data signals each containing a sequence of frames. Each frame contains a pointer to indicate the start timing of the frame and specify positive, negative or zero destuffing. A pointer is detected from each data signal and compared with a previous pointer of the data signal stored in a memory. From this comparison the type of destuffing to be performed on a frame is determined and in response to it, +1, -1 or 0 is added to the previous pointer to produce a current pointer which is then used to rewrite the previous point. A binary clock count value is generated by a single phase counter and …