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:
Feb. 06, 2007
Filed:
Nov. 24, 2004
William Lo, Cupertino, CA (US);
Yiqing Guo, Cupertino, CA (US);
Tak Tsui, Sunnyvale, CA (US);
Tsin-ho Leung, San Jose, CA (US);
Runsheng He, Sunnyvale, CA (US);
Eric Janofsky, Sunnyvale, CA (US);
William Lo, Cupertino, CA (US);
Yiqing Guo, Cupertino, CA (US);
Tak Tsui, Sunnyvale, CA (US);
Tsin-Ho Leung, San Jose, CA (US);
Runsheng He, Sunnyvale, CA (US);
Eric Janofsky, Sunnyvale, CA (US);
Marvell International Ltd., Hamilton, BM;
Abstract
A physical layer device communicates over a cable and includes a cable tester that determines a cable status, which includes an open status, a short status and a normal status. The cable tester includes a pretest module that senses activity on the cable and selectively enables testing based on the sensed activity. A test module is enabled by the pretest module, transmits a test pulse on the cable, measures a reflection amplitude, calculates a cable length, and determines the cable status based on the measured amplitude and the calculated cable length. A digital signal processor (DSP) communicates with the cable and that has a digital gain parameter. A cable length estimator communicates with the DSP and estimates cable length based on the digital gain parameter.