The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 1982
Filed:
Jan. 31, 1980
Applicant:
Inventor:
Harry E Mussman, Glen Ellyn, IL (US);
Assignee:
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; H04M / ;
U.S. Cl.
CPC ...
179 / ; 179 / ; 179 / ; 179 / ;
Abstract
A telephone switching system is disclosed which includes a digitally controllable multifunction signaling circuit responsive to commands from a central processor to generate or to receive subscriber line pulse signals of amplitude and duration specified by the processor commands. A bridge switch amplifier arrangement having an essentially constant voltage input signal and pulse width modulated control, is used to provide a substantially constant amplitude output signal. A two-stage access switch allows the signaling circuit to be time-shared among groups of subscriber lines.