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:
Dec. 06, 1977
Filed:
Apr. 23, 1976
James M Kasson, San Mateo, CA (US);
Samuel F Wood, Los Altos Hills, CA (US);
Rolm Corporation, Cupertino, CA (US);
Abstract
A key telephone adapter unit providing interconnection between a key telephone instrument having a line selector unit with a plurality of lines and a corresponding plurality of line status indicators and an electronic telephone switching system in which audio frequency voice information signals and supervisorial serial data signals are interfaced to individual telepone handsets by first and second conductor pairs. The adapter unit responds to a serial data polling command received from the switching system over the data pair by converting signals representative of the status of each line of the associated key telephone instrument to serial data signals for transfer to the switching system over the data pair; and responds to other serial data commands received from the switching system over the data pair by generating command signals for directing operation of the line status indicators, e.g. the status lamps, the bell and the buzzer.