Patent
1975-12-04
1977-05-10
Stewart, David L.
179 18EA, H04Q 1104
Patent
active
040229823
ABSTRACT:
Apparatus establishes a connection between a certain network input or input channel and a certain network output or output channel by rearrangement of a three-stage switching network, where, in a specific network condition, each network input or input channel is assigned to a specific network output or output channel. The desired connection is derived by means of successive permutations of the connections within the switching stages until the desired connection has been attained.
The apparatus includes a special switching memory wherein the actual network condition is recorded. The organization of the memory is such that the various memory cells are addressed according to the numbering of the interstage links on one side of the central switching stage and each of the cells has a record of which network input and network output is interconnected via the link in question. The apparatus further includes means for the identification of the addresses involved in the desired connection and for the subsequent determination and execution of the necessary permutations, based on these addresses.
REFERENCES:
patent: 3462743 (1969-08-01), Milewski
patent: 3511937 (1970-05-01), Bastian
patent: 3638193 (1972-01-01), Opferman
patent: 3916124 (1975-10-01), Joel
Stewart David L.
Telefonaktiebolaget L M Ericsson
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