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. 13, 2015
Filed:
Feb. 25, 2011
Wei Fu, San Diego, CA (US);
Christopher Thomas, San Diego, CA (US);
Wei Fu, San Diego, CA (US);
Christopher Thomas, San Diego, CA (US);
SMSC Holdings S.a.r.l., Luxembourg, LU;
Abstract
Systems and methods are provided to calibrate and compensate for signal impairments from the use of cables in data communication devices. Signal impairments such as intra-pair skew of differential signals and frequency dependent insertion loss are measured during a calibration phase. One end of the cable is connected to a communication device. The other end of the cable is configured to loop back calibration signals transmitted from the communication device. The calibration signals looped back from the communication device are received and measured by the communication device. The measured impairments are used to determine transmit and receive impairment compensation settings to compensate for impairments caused by the cable. These settings are stored and used to adjust signals transmitted from the communication device to compensate for the transmit impairment. These setting are also used to adjust signals received by the communication device to compensate for the receive impairment.