Digital switching unit for a multirate time-division multiplex d

Details Digital switching unit for a multirate time-division multiplex d Digital switching unit for a multirate time-division multiplex d

1978-03-07

1979-09-18

Stewart, David L.

179 15AQ, 179 15BV, H04Q 1104

Patent

active

041684010

ABSTRACT:
A digital switching unit is used in a multirate time-division multiplex digital switching network, 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 multiple of, one another are given a first multiplexing converting them into the second-order digital data channels having a second predetermined rate. The switching unit comprises at least one buffer store in which the first-order channel words multiplexed into third-order channels are grouped at an address having first and second part, whose first part is the address of the second-order channel containing the first-order channel word in the third-order channel and whose second part is the address of the first-order channel in the second-order channel. The switching unit includes means for supplying from addresses of the words in said second-order channels the first-order channel addresses associated with said word addresses in the second-order channels according to the multiplexing schemes. Supplying means comprises a read-only memory containing for each word group of a second-order channel resulting from a multiplexing of P first order channels according to said multiplexing schemes converting them into a channel analogous to a first-order channel having a rate equal to the highest of said different rates of said first-order channels, a coded word representative of the combination of rates associated with said P first-order channels, and means for decoding each coded word to supply the P first-order channels addresses of each word group associated with a second-order channel to said buffer store.

REFERENCES:
patent: RE29215 (1977-05-01), Carney
patent: 3952162 (1976-04-01), Texier
patent: 3987251 (1976-10-01), Texier

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