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:
Jan. 10, 1995
Filed:
May. 11, 1992
Isamu Ozawa, Hachiouji, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A telephone exchange accommodates a plurality of lines in a primary group of an Integrated Services Digital Network (ISDN), as well as a plurality of extension terminals, in which a plurality of channels constitute each line. Control is performed in such a manner that the status of a line of an extension terminal when this terminal is using one channel among the plurality thereof is indicated by lighting an Light Emitting Diode (LED) in the color green, the status of a line of an extension terminal when this terminal is not using any of the plurality of channels but all of these channels are being used by other terminals is indicated by lighting the LED in the color red, and the status of a line of an extension terminal when this terminal is not using any of the plurality of channels but some of these channels are being used by other terminals is indicated by flashing the LED in the color red. The flashing period of the flashing red LED is made to differ in dependence upon the total number of channels and the number of channels in use.