Multiplex communications – Wide area network – Packet switching
Patent
1992-12-23
1994-01-18
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370106, 370108, 371 371, 371 42, H04L 522, H03M 1300
Patent
active
052804844
ABSTRACT:
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 (X.sub.j to X.sub.j+n-) beginning with any one (X.sub.j) 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 (S.sub.1 to S.sub.n-k) in several networks (N.sub.1 to N.sub.n-k) which operate in parallel and each of which calculates one syndrome component. The received bit sequence is delayed until the networks have calculated the syndromes for a given n-bit bit group and until a syndrome evaluation circuit (LS) indicates whether the bit group is a code word.
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"Error-Correcting Codes" by W. W. Peterson, MIT and John Wiley & Sons, Inc., New York, London, 1961, pp. 30-36.
ALCATEL N.V.
Hsu Alpus H.
Olms Douglas W.
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