Multiplex communications – Wide area network – Packet switching
Patent
1980-03-05
1982-11-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370110, 370118, H04J 312
Patent
active
043588450
ABSTRACT:
A process for the compression of signalling data or the like transmitted in a stream of digital PCM information organized in multiplexing frames, the signalling data being inserted in a specific time slot of the PCM frames, the signalling binary digits transmitted in the same PCM frame belonging to independent signalling channels a, b, . . . of rate H.sub.1, comprising the steps of extracting the signalling data from the digital stream and effecting in parallel, for each signalling channel, a processing comprising the steps of coding the transitions by a group of binary digits of which the first indicates the polarity of the transition and the following indicates or indicate in which nth fraction of a clock period corresponding to a rate H.sub.1
the transition is located, and transmitting unchanged at least one of the bits which follow the transition, the signals L.sub.a, L.sub.b . . . thus obtained containing the same quantity of information as the signalling channels, but having a rate divided by n.
REFERENCES:
patent: 3720791 (1973-03-01), Yada et al.
patent: 3723657 (1973-03-01), Muller
patent: 3761621 (1973-09-01), Vollmeyer et al.
patent: 4119795 (1978-10-01), Hoelzl et al.
Olms Douglas W.
Societe Anonyme de Telecommunications Company
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