H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/24
H04Q 3/42 (2006.01) H04Q 3/68 (2006.01)
Patent
CA 1261442
NONBLOCKING SWITCHING SYSTEM AND METHOD Abstract of the Disclosure A NONBLOCKIG 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 established paths between the sources and destination 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.
522591
Cicero John A.
Wojcinski Robert F.
Macrae & Co.
Tellabs Inc.
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