Robert J Dehilster

US Patent:

45049424, Mar 12, 1985

Filed:

Apr 22, 1982

Appl. No.:

6/371053

Inventors:

Enn Aro - Delaware OH
Robert J. DeHilster - Worthington OH
Leonard E. Bogan - Columbus OH

Assignee:

International Telephone and Telegraph Corporation - New York NY

International Classification:

H04Q 1104
H04J 302

US Classification:

370 58

Abstract:

A line switch for a digital telephone switching system utilizes distributed processing. The line switch comprises one or more switch modules. Each switch module is coupled to a central office switching system via one or more PCM lines which utilize common channel signaling. Each switch module comprises groups of line circuits, each line circuit being coupled to a subscriber line. Three separate distributed processor functions are provided in each line switch module. A first processor is utilized to communicate with the central office switching system and to coordinate the operations within the line switch module. A second processor is provided to control clock generation and rate conversion circuits. Each group of line circuits includes a third processor to control the operations of the line circuits and to gather information from the line circuit. A busing arrangement is provided within the line switch such that both control information and PCM voice data are routed throughout the line switch.