Patent
1975-04-07
1976-09-21
Cooper, William C.
179 15BA, 179 15AF, H04J 304
Patent
active
039820777
ABSTRACT:
An asynchronous digital time division multiplexer and demultiplexer combination at one communication terminal is disclosed that will multiplex first N asynchronous source data signals having a first mixture of different bit rates into a transmitted synchronous data stream having a predetermined fixed data format and a given bit rate greater than the total of the bit rates of the source data and to demultiplex second N asynchronous source data signals having a second mixture of different bit rates from a received synchronous data stream having the predetermined fixed data format and the given bit rate. The combination includes an automatic channel assignment circuit to assign channels of the two data streams to the asynchronous source data signals in a manner to minimize temporary data memory regardless of the number of different bit rates by assigning the data signals to channels of the associated one of the two data streams so that the bits of each of the data signals tend to have equal spacing throughout the bits of the associated one of the two data streams. The channel assignment control circuit also includes a means to automatically indicate when the total of the mixture of bit rates has exceeded an allowable maximum.
REFERENCES:
patent: 3742145 (1973-06-01), Clark
patent: 3766322 (1973-10-01), Moffett
patent: 3781818 (1973-12-01), Pardoe
patent: 3809820 (1974-05-01), Sullivan
patent: 3868481 (1975-02-01), Patrusky
patent: 3873773 (1975-03-01), Guy
Clark James Monroe
Cohen Stuart Barry
Magnus Arthur Howard
Cooper William C.
Hill Alfred C.
International Telephone and Telegraph Corporation
O'Halloran John T.
Popek Joseph A.
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