Method and apparatus for remote signalling on a digital transmission link
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United States of America Patent
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Aug 25, 1987
Grant Date -
N/A
app pub date -
Nov 27, 1985
filing date -
Nov 30, 1984
priority date (Note) -
Expired
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Abstract
The method consists in momentarily replacing the data transmitted by a digital data link with a digital message comprising two non-consecutive sequences, with the first sequence being a prefix sequence and the other sequence being a suffix sequence. The period of time separating the prefix and suffix sequences is variable and encodes remote signalling data. FIG. 2 shows a message transmitter circuit fitted in digital link equipment for operation at a very high data rate, and provided with a circuit (6') for detecting and handing alarms and with a circuit (3) for recovering the bit rate from the digital stream. A pattern generator (10) serves to generate a 1000 pattern and its 0111 complement from the recovered check rate. An oscillator (20) has a period which defines the time interval separating the prefix sequence and the suffix sequence. This oscillator controls a sequencer (25) which in turn controls a prefix sequence building circuit (30) and a suffix sequence building circuit (40) both of which act via logic gates on a circuit for selecting pattern types and on switching means (19) for inserting the selected sequence into the digital stream instead data.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Bourret, Gerard | La Ville Du Bois, FR | 7 | 71 |
Franco, Pierre | Fresnes, FR | 5 | 97 |
Lacroix, Jean-Claude | Bruyeres le Chatel, FR | 8 | 86 |
Le, Gall Stephane | Sceaux, FR | 4 | 43 |
Pochet, Jacques | Le Plessis Pate, FR | 5 | 58 |
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