Pulse or digital communications – Repeaters – Testing
Patent
1985-11-27
1987-06-30
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
370111, 34082562, H04L 522
Patent
active
046776443
ABSTRACT:
The method consists in momentarily replacing the data in a transmitted digital data stream by a remote signalling message which is built up from consecutive sequences, each of which is obtained by repeating a specific binary pattern chosen from a plurality of possible binary patterns which are generated from the second and fourth sub-harmonics of a clock signal at the bit rate of the digital stream, and from logical combinations thereof. FIG. 2 is a circuit diagram of a transmitter circuit for transmitting a remote signalling message. Said transmitter circuit is located in equipments on a very high data rate digital link, which equipments include a circuit (6') for detecting and handling alarms, and a circuit (3) for recovering the bit rate from the digital stream. Divide-by-two circuits (10, 14) and a logic gate (16) serve to generate three kinds of pattern from the recovered clock rate, namely: 0101, 0011, 1000. A sequencer (21) builds up sequences of patterns within a remote signalling message by means of a multiplexer (20) whose inputs are encoded with the message to be transmitted, a pattern generator selector circuit (11, 15, 16), and switching means (18) for inserting the remote signalling message instead of the digital stream.
REFERENCES:
patent: 2997638 (1961-08-01), Brittain
patent: 3518547 (1970-06-01), Filipowsky
patent: 4406919 (1983-09-01), Pospischil
Proceedings of the IEEE, vol. 68, No. 10, Oct. 1980, pp. 1299-1303, NY, US, C. D. Anderson et al, "An Undersea Communication System Using Fiberguide Cables", p. 1302.
Bourret Gerard
Franco Pierre
Lacroix Jean-Claude
Le Gall Stephane
Pochet Jacques
Compagnie Industrielle des Telecommunications Cit-Alcatel
Safourek Benedict V.
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