Time-division multiplex communication system with a synchronizing circuit at the receiving end which responds to the coding of words inserted in the transmitted information

Abstract From the Canadian patent

There are TDM communication systems in which synchronization is accomplished by means of code words which are transmitted at regular time intervals and coded in a particular code. In systems where the signals are transmitted in packets of uniform length, each of the code words contains the information of the so-called header of a packet. The checking device according to the invention successively checks all n-bit bit groups (Xj to Xj+n-1) beginning with any one (Xj) of the successive bits of the received bit sequence as to whether they are coded in a particular code. This is done by calculating the syndrome (S1 to Sn-k) in several networks (N1 to Nn-k) which operate in parallel and each of …