Patent
1975-05-27
1976-04-20
Stewart, David L.
179 15BV, 179 15BY, H04Q 1104
Patent
active
039521621
ABSTRACT:
A time division digital switching network comprises first multiplexing means in which first-order digital data channels transmitting words consisting of a given number of bits and having first rates which are different from but multiples of one another undergo a first multiplexing converting them into a second-order digital data channels having a second predetermined rate. Thereafter there are provided second multiplexing means in which the second-order digital channels undergo a second multiplexing converting them into third-order digital data channels 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 depends upon the first-order channel they occupy in the second-order channel. The bits of a given rank of the words of a second-order channel form a pseudorandom sequence having a known period and, therefore, the bits of a given rank of the words of a third-order channel form a number of interleaved pseudorandom sequences. The digital switching unit includes means for separating the interleaved pseudorandom sequences and for deducing from the bits composing them the second part of the address of the words.
REFERENCES:
patent: 3715508 (1973-02-01), Blasbalg
patent: 3794768 (1974-02-01), Carney
patent: 3885105 (1975-05-01), Hildenbrand
patent: 3890469 (1975-06-01), Kelly
Davancens Michel R.
Texier Alain G.
Saffitz Abraham A.
Stewart David L.
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