Reframing method for a carrier system having a serial digital data bit stream

Claim 1

In a reframing method for a carrier system having a serial digital data bit stream having frames and multiframes which consist of a predetermined number of frames each frame having an additional frame bit used as a terminal frame code which is an alternating pattern of 1 and 0 bits every other frame and used as a signalling frame code for signalling frame detection which is a pattern of three 0 bits followed by three 1 bits every other frame said frame bit codes repeating themselves every multiframe said carrier system including a frame code generator for generating said frame bit codes said method comprising the following steps: storing a plurality of corresponding bits from each of at least four consecutive frames; searching for a valid terminal frame code in a group of four bits consisting of 1 corresponding bit from each of said four frame, said 4 bits, if valid, representing a unique frame of said multiframe; comparing said group of 4 bits in which a valid terminal frame code was found to 4 consecutive bits generated by said frame code generator; and synchronizing said generator to generate said multiframe code corresponding to said 4 valid bits.