Distributed bit-by-bit destuffing circuit for byte-stuffed multiframe

Abstract

In a byte destuffing circuit, a received data signal in a byte interleaved multiple frame structure is stored into a buffer memory, and a clock sequence is recovered. The recovered line clock is applied to a write address generator for storing the data on a per byte basis into a buffer memory. In response to a destuffing control signal, the write address generator suspends the generation of a write address if positive byte stuffing is effected at the transmit end, and destuffing is effected on the recovered clock sequence on a bit-by-bit basis during successive eight frames. The destuffed clock sequence is applied to a phase comparator for comparison with a local clock sequence generated by a VCO which is controlled by the phase comparator in a phase-locked loop. The local clock sequence is used to drive a read address generator for reading data from the buffer memory on a per byte basis.