Communications: electrical – Continuously variable indicating – With meter reading
Patent
1983-05-16
1986-01-21
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082579, 179 18GF, 179 18GE, 179 18EA, H04Q 362, H04M 300
Patent
active
045660077
ABSTRACT:
A two-stage, rearrangeable multiconnection switching network for connecting N.sub.1 input channels to n.sub.2 output channels. The network comprises a number of first stage switches and a second stage switch, e.g., rectangular arrays. The second stage switch has n.sub.2 outlets each connected to one of the n.sub.2 output channels. A connection arrangement connects each of the first stage switch inlets to an associated predetermined input channel such that for any group of n.sub.2 of the input channels, there is a group of n.sub.2 of the first stage switches each having one inlet connected to a different one of that group of n.sub.2 of the input channels. The approach is easily extendible to switching networks serving any larger number, N.sub.2, of output channels by adding second stage switches and connecting each additional second stage switch to each first stage switch. In larger networks, the first and second stage switches are themselves replaceable by two-stage networks in accordance with the invention.
REFERENCES:
patent: 3129407 (1964-04-01), Paull
patent: 4038638 (1977-07-01), Hwang
"A Study of Non-Blocking Switching Networks," C. Clos, Bell System Technical Journal, Mar. 1953, pp. 406-424.
"Three-Stage Multiconnection Networks which are Non-Blocking in the Wide-Sense," F. K. Hwang, Bell System Technical Journal, vol. 58, No. 10, Dec. 1979, pp. 2183-2187.
"On Rearrangeable Three-Stage Connecting Networks," V. E. Benes, Bell System Technical Journal, vol. 41, No. 5, Sep. 1962, pp. 1481-1492.
AT&T Bell Laboratories
Hodgkins Sharon L.
Padden Frederick W.
Watland Ross T.
Yusko Donald J.
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