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. 21, 2006
Filed:
Mar. 27, 2003
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 with a second physical layer device over a cable. The physical layer device includes a cable tester that identifies when the second physical layer device is disconnected from the cable. The cable tester includes a test initiating circuit that initiates a cable test when a link is lost, a test module that transmits test pulses on the pairs of the cable, measures reflection amplitudes, calculates cable lengths, and determines whether the pairs have said open status based on said measured amplitude and said calculated cable length, and a reporting circuit that generates a disconnect signal when at least one of the pairs has an open status.