Multiplex communications – Wide area network – Packet switching
Patent
1979-12-26
1981-10-20
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 63, 17917523, H04J 312
Patent
active
042964920
ABSTRACT:
A time division switching system having distributed control processors is disclosed. The switching system includes time-slot interchange units having associated subscriber sets and a time-shared space division network for interconnecting the time-slot interchange units. Each of the time-slot interchange units and the time-shared space division network are controlled by separate control processors. In response to called subscriber set identifying information from a calling subscriber set, the control processor associated with the time-shared space division network completes the communication path through the time-shared space division network to connect the time-slot interchange units associated with the calling and called subscriber sets. The control processors in the time-slot interchange units then determine if communication path continuity is present between them before the subscriber sets are connected to the communication path through the time-slot interchange units. Additionally, arrangements are included for detecting loss of continuity in the communication path.
REFERENCES:
patent: 3639904 (1972-02-01), Arulpragasam
patent: 3743789 (1973-07-01), Krupp
patent: 3909562 (1975-09-01), Lager
patent: 4022979 (1977-05-01), Smith
patent: 4064369 (1977-12-01), Battocletti
patent: 4101737 (1978-07-01), Philip
patent: 4195206 (1980-03-01), Baichtal
Bell Telephone Laboratories Incorporated
Olms Douglas W.
Samples Kenneth H.
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