Multiplex communications – Wide area network – Packet switching
Patent
1985-11-27
1988-02-23
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
34082504, H04J 312
Patent
active
047275405
ABSTRACT:
Apparatus for implementing a remote signalling method which consists in momentarily replacing the transmitted digital data stream by a remote signalling message which is built up from not more than n identical and nonconsecutive sequences of N bits, with the first sequence of each message being present on each occasion that a message is sent, and with the remaining n-1 sequences of each message representing, by their presence or absence, the values 0 or 1 of n-1 digits in a binary number encoding remote signalling data. FIG. 2 shows a circuit for transmitting a remote signalling message from an equipment along a very high data rate digital link, which equipment is provided with a circuit (6') for detecting and handling alarms, and a circuit (3) for recovering the bit rate from the digital stream. An OR gate (12) associated with dividers (10, 11) implemented in a high speed ECL technology generates a repetitive 1000 pattern on which a sequence is based, and switching device (13) also implemented in high speed ECL technology serves to insert sequences of said pattern into the digital stream to constitute a remote signalling message. The switching device is controlled by message-building logic circuits made from slower I.sup.2 L or Schottky technology.
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Bourret Gerard
Franco Pierre
Lacroix Jean-Claude
Le Gall Stephane
Pochet Jacques
Chin Stephen
Compagnie Industrielle Des Telecommications Cit-Alcatel
Griffin Robert L.
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