Patent
1975-04-02
1976-10-26
Cooper, William C.
179 15BY, H04J 114
Patent
active
039885437
ABSTRACT:
Message transmission between subscriber stations served by different central offices takes place via frequency-division channels through the intermediary of couplers recognizing different line signals, specifically pulse sequences modulating the amplitude of a fixed-frequency oscillation on a test wire, to initiate certain switching operations. A processor, responding to these signals either upon initiation of a connection or in the course thereof, summons an available modem which is temporarily connected to the associated coupler and emits a characteristic a-c signal picked up by a remote coupler at another exchange which thereupon causes its processor to connect another modem to it, to the exclusion of any subscriber line to which that coupler may have been previously connected. The two modems then intercommunicate and work into respective logic networks which, under their control, carry out the requisite switching operations whereupon the modems are released upon establishment or re-establishment of the desired connection.
REFERENCES:
patent: 3226484 (1965-12-01), James
patent: 3261922 (1966-07-01), Edson
patent: 3558827 (1971-01-01), Lucas
patent: 3701851 (1972-10-01), Starrett
Dall'Olio Cristiano
Garetti Enzo
Cooper William C.
CSELT - Centro Studi E Laboratori Telecomunicazioni
Dubno Herbert
Popek Joseph A.
Ross Karl F.
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