Multiplex communications – Wide area network – Packet switching
Patent
1985-11-27
1987-08-25
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 84, 370111, H04J 312, H04J 322
Patent
active
046897909
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.
REFERENCES:
patent: 4375098 (1983-02-01), Gerke et al.
patent: 4394759 (1983-07-01), Donne
patent: 4472803 (1984-09-01), Iijima
patent: 4569046 (1986-02-01), Hadziomerovic et al.
patent: 4581746 (1986-04-01), Arnold
Bourret Gerard
Franco Pierre
Lacroix Jean-Claude
Le Gall Stephane
Pochet Jacques
Compagnie Industrielle des Telecommunications Cit-Alcatel
Kuntz Curtis
Olms Douglas W.
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