Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Patent
1986-01-27
1988-03-15
Ng, Jin F.
Telephonic communications
Centralized switching system
Switching controlled in response to called station...
379 16, H04Q 342
Patent
active
047318252
ABSTRACT:
A nonblocking switching system for communications systems is characterized by two identical blocking networks, each for being connected in series between sources and destinations to be selectively interconnected. One network actively establishes paths between the sources and destinations while the other, although conditioned to be able to provide such paths, remains inactive in a standby mode for establishing the paths should the active network fail. If a blocking state occurs in the active network before its maximum realizable capacity is reached, a nonblocking condition of the system is established by eliminating all of the paths in the inactive network, and then reestablishing the paths in accordance with a relatively simple algorithm that loads the network without a blocking state being reached before the network is completely full. The roles of the active and inactive networks are then reversed, so that the previously inactive network becomes active and establishes the paths between sources and destinations and the previously active network becomes inactive. The paths in the newly active network are then copied into the newly inactive network so that it will be prepared to connect the sources and destinations should the active network fail.
REFERENCES:
patent: 3865999 (1975-02-01), Spitaels
patent: 4345324 (1982-08-01), Smitt
patent: 4455645 (1984-06-01), Mijioka et al.
patent: 4497054 (1985-01-01), Read
Benes, "Blocking States in Connecting Networks Made of Square Switches Arranged in Stages", BSTJ, vol. 60, No. 4 (Apr. '81), pp. 511-521.
Cicero John A.
Wojcinski Robert F.
Ham Mark E.
Ng Jin F.
Tellabs Inc.
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