Gail Lynn Haygood

US Patent:

44882947, Dec 11, 1984

Filed:

Mar 30, 1982

Appl. No.:

6/363424

Inventors:

Tore L. Christensen - Boulder CO
Gail L. Haygood - Boulder CO
Douglas A. Spencer - Boulder CO
Steven J. Szymanski - Boulder CO

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H04J 302

US Classification:

370 84

Abstract:

Apparatus for facilitating the transport and switching of synchronous and asynchronous digital data signals presented by data terminal or data communication equipments to a voice switching network such as a PBX advantageously without the use of modems. The clock rate of the PBX user's digital data is multiplied by a variable factor to define a synchronous transmission clock rate on a data link between a pair of interfaces, one locally connecting to the data terminal or data communications equipment and the other appearing as a port of the PBX switching equipment. The higher rate on the data link permits both the digital data as well as a control channel to be provided. Variations in the data terminal or data communications equipment clock rate do not affect the control channel. Variations in the voice sampling rate of switching modules serving different groups of ports through which the digital data is transported are accommodated.