Synchronization for a digital train intended for a correct framing of received information
First Claim
1. A process for a synchronization of a digital transmission system with a TDM multiplexed group of signals divided into equal and recurrent time intervals, said process comprising the steps of:
- (a) transmitting the information divided into data packets, each data packet (A, B or D) having a time span which fills one of said time intervals and including a header (X, Y or Z) which has a fixed length and is followed by the data field.(b) transmitting an interval synchronizing signal within each idle time interval (C), not carrying a data packet, said interval synchronizing signal having the length of a packet header and not being used as a packet header, and(c) entirely filling the remaining part of the idle interval with a sequence of signals.
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Abstract
A digital train is synchronized to correct the framing of received information. To this end, the transmitted digital train is timely structured into recurrent time intervals having a fixed length. The information to be transmitted is divided into blocks called packets, having the length of a time interval and comprising a field of data and a header used for identifying the packets. A digital transmission system with a TDM multiplex is divided into equal and recurrent time intervals, wherein the information is indexed by an associated explicit header, and wherein the absence of information in a time interval is indexed by a specific header which is not used elsewhere as a header. The recognition of a specific address is also used for synchronizing the alignment of the time intervals.
44 Citations
13 Claims
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1. A process for a synchronization of a digital transmission system with a TDM multiplexed group of signals divided into equal and recurrent time intervals, said process comprising the steps of:
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(a) transmitting the information divided into data packets, each data packet (A, B or D) having a time span which fills one of said time intervals and including a header (X, Y or Z) which has a fixed length and is followed by the data field. (b) transmitting an interval synchronizing signal within each idle time interval (C), not carrying a data packet, said interval synchronizing signal having the length of a packet header and not being used as a packet header, and (c) entirely filling the remaining part of the idle interval with a sequence of signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification