Time-division switching network for switching multiformat multip

Details Time-division switching network for switching multiformat multip Time-division switching network for switching multiformat multip

1975-12-29

1976-10-26

Stewart, David L.

179 15AT, H04Q 1104

Patent

active

039885445

ABSTRACT:
A time division digital switching network comprises first multiplexing means in which first-order digital data channels transmitting words which have a format selected amongst two formats and a first rate selected amongst a plurality of rates different from, but multiple of, one another undergo a first multiplexing converting them into a second-order digital data channel having a second predetermined rate. Each given second-order channel may comprise either a plurality of first order channels of one and the same rate or a combination of first-order channels having different rates. Thereafter there are provided second multiplexing means in which the second-order digital channels undergo a second multiplexing converting them into a third-order digital data channel having a third predetermined rate. In a digital switching unit having at least one buffer store, the first-order channel words multiplexed into the third-order channels are grouped at an address whose first part depends upon the second order channel they occupy in the third-order channel and whose second part is derived from the word number in a word multiframe. The bits of consecutive small format words form large-format words. As the small format words may undergo transposition in their sequential order during switching, means are provided for reconstituting the proper sequential order amongst the switched small format words.

REFERENCES:
patent: 3535450 (1970-10-01), Vollmeyer
patent: 3794768 (1974-02-01), Carney
patent: 3890469 (1975-06-01), Kelly
patent: 3894189 (1975-07-01), Edstrom
patent: 3922494 (1975-11-01), Cooper
patent: 3952162 (1976-04-01), Texier

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