Method of coding digital information organized in frames using a CMI code, a device for implementing this method and application to servitude information for a high capacity digital network

摘要

A method is provided for coding in the CMI code digital information organized in frames, wherein each frame locking word V, chosen equal to 1, is placed in the last position in the frame. The CMI code is violated at the position of said word V and, for keeping the statistics of the coding law, it is arranged for this violation to be alternately 00 and 11, from one frame to another. For this, immediately before the word V is inserted a binary filling word B, chosen by taking into account the number of binary "1"s before filling. If the number of binary "1"s before filling is even, the binary element B is coded like the violation of the frame locking word V and, in the opposite case, B is coded 01.