Multiplex communications – Wide area network – Packet switching
Patent
1989-04-14
1991-09-10
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 54, 340826, H04Q 1104
Patent
active
050480111
ABSTRACT:
A fast packet switching system has an interconnection network associated with a distributed control structure composed of a plurality of processing units (UC1-1 . . . UC3-16) managing the routing at the virtual call level. At least some processing units each associated with a group of network inputs/outputs store bandwidth occupancy data relevant to the interstage links which can be reached from the inputs of the group and are included between the inputs and a central network stage where there is a maximum number of alternative paths or, respectively, bandwidth occupancy data relevant to interstage links which lead to the outputs of the group and are included between the stage and the output, the data being updated whenever a new call is routed. When a virtual call is to be routed, the processing units associated with the input or respectively the output involved in the connection, evaluate a cost function of the connection along the portion of each of the possible routing paths included between the input and the stage where there is the maximum number of alternative paths, or for the portion of each routing path included between such stage and the output. The results of the evaluations carried out by these units are combined in one of the units which determined a global cost function for the individual connection paths and forwards the call on the path presenting the minimum cost function.
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CSELT - Centro Studi e Laboratori Telecomunicazioni S.P.A.
Dubno Herbert
Kizou H.
Olms Douglas W.
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