Method for expanding N.times.N three-stage switching network to

Details Method for expanding N.times.N three-stage switching network to Method for expanding N.times.N three-stage switching network to

1989-10-03

1991-07-16

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082503, 340826, H04B 100, H04Q 100

Patent

active

050328379

ABSTRACT:
N
first-stage switches of an existing N.times.N three stage network are decomposed into 2N
virtual switches having n inlets and 2n outlets, and N
third-stage switches are likewise decomposed into 2N
virtual switches having 2n inlets and n outlets. The outlets of each first-stage virtual switch are connected respectively to the inlets of different second stage existing switches, the inlets of each third-stage virtual switch being connected respectively to the outlets of different second stage existing switches. When expansion stages are installed, existing connections from the outlets of the N
first-stage virtual switches are removed and new connections are established therefrom to the inlets of different expansion second-stage switches, and existing connections to the inlets of the N
third-stage virtual switches are removed and new connections are established therefrom to the outlets of different expansion second-stage switches. New connections from the outlets of the expansion first-stage switches to the inlets of different second stage existing switches and to the inlets of differnet expansion second-stage switches are established, and new connections from the inlets of the expansion third-stage switches to the outlets of different second stage existing switches and to the outlets of different expansion second-stage switches are established. The first and third stages virtual switches are then composed into the original physical switches.

REFERENCES:
patent: 4394541 (1983-04-01), Seiden
patent: 4400627 (1983-08-01), Zola
patent: 4417245 (1983-11-01), Melas et al.
patent: 4807280 (1989-02-01), Posner et al.

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