H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/22
H04J 3/02 (2006.01)
Patent
CA 1234644
ASYNCHRONOUS SIGNALING FOR DIGITAL COMMUNICATION CHANNEL BY MICHAEL J. GREEN AND JAMES B. MC KAY ABSTRACT OF THE DISCLOSURE A selected one of a plurality of unique N-bit digital code words that corresponds to an associated signaling message is continuously transmitted until it is desired to transmit a different signaling message. Decoder logic in the receiver looks at a new group of N-signaling bits during each signaling bit interval, without reference to the start of a trans- mitted code word, and makes a decision during each signaling bit interval as to what signaling message was transmitted. In this manner a keep-alive signal is virtually continuously provided in the receiver. Latch cir- cuitry repeats the previous decision from the decoder logic when the cur- rent group of N-signaling bits does not correspond to one of the unique code words or an ordered permutation thereof. In an alternate embodiment a memory circuit requires that the decoder logic repeat the same decision as to what signaling message was transmitted for P consecutive groups of N-signaling bits (i.e., for P consecutive signaling bit intervals) before the latch circuit will indicate that a different signaling message is being transmitted.
487935
Green Michael J.
Mckay James B.
British Columbia Telephone Company
R. William Wray & Associates
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