Electrical transmission or interconnection systems – Switching systems – Plural switches
Patent
1981-05-04
1983-08-23
Brown, Thomas W.
Electrical transmission or interconnection systems
Switching systems
Plural switches
179 18G, 3408258, H04Q 300
Patent
active
044006276
ABSTRACT:
An arrangement and method for interconnecting the stages of a space division switching network which provides simple and continuous growth from a small number of lines to the system's maximum number of lines. The switching network comprises up to M input stage switches, center stage switches and up to M output stage switches. Incoming lines are connected to the input terminals of the input stage switches such that no input stage switch is connected to a number of incoming lines which exceeds the number of incoming lines connected to any other input stage switch by more than one. The number of center stage switches is established from a predetermined interconnection plan and at any given time, the number of center stage switches is a function of the number of lines connected to the input stage switch having the largest number of lines connected thereto. As each line is connected to an input stage switch, the output terminals of that switch are distributed over the available center stage switches. The output stage switches are connected to the center stage switches and to outgoing lines in analogous manner.
REFERENCES:
patent: 3737586 (1973-06-01), Johnson
patent: 4038497 (1977-07-01), Collins et al.
patent: 4254498 (1981-03-01), Tawara et al.
"The System X Digital Switching Subsystem (DSS)," A. S. Philip, System Technology (Great Britain), Sep. 1979, No. 32, pp. 5-19.
Bell System Technical Journal, Sep., 1977, Section 2.3.2, "Time-Multiplexed Switch Frames," pp. 1035-1037.
Bell System Technical Journal, Mar., 1953, "A Study of Non-Blocking Switching Networks," Charles Clos, pp. 406-424.
Bell Telephone Laboratories Incorporated
Brown Thomas W.
Samples K. H.
Watland R. T.
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