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. 16, 2012
Filed:
Nov. 04, 2009
Applicant:
Jia-xuan Huang, Taipei Hsien, TW;
Inventor:
Jia-Xuan Huang, Taipei Hsien, TW;
Assignee:
Hon Hai Precision Industry Co., Ltd., Tu-Cheng, New Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M 3/22 (2006.01); H04L 12/42 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method run in a gateway for detecting a communication link between a called telephone and a telephone switch is provided. The method firstly detects if a ringer equivalency number (REN) is equal to zero. If the REN equals to 0, the method further determines if each discharge curve of a positive wire and a negative wire of the called telephone complies with a corresponding standard discharge curve, so as to determine if the communication link between the called telephone and the telephone switch has been established.