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:
Mar. 09, 2004
Filed:
Jan. 29, 2001
David Carotti, Brockenhurst, GB;
Paul Wilson, Hertfordshire, GB;
Nortel Networks Limited, St. Laurent, CA;
Abstract
A technique for compensating for skew between parallel digital data bitstreams resulting from transmission over a path, not requiring the sending of a training sequence or excessive down-time, is effected by sending a parallel reference bitstream carrying a sequence of samples taken from the individual data bitstreams. It is found that correlation of the reference bitstream with the data bitstreams is sufficient to identify the skew amount. This can then be signalled or preferably corrected at the receive end or pre-corrected at the transmit end of the path. Signalling can also be superimposed by multiplexing the reference bitstream with signalling information with little or no additional overhead. This can be particularly useful to shut down a laser in an optical transmission path if a broken optical fibre is detected that would otherwise pose a health hazard to personnel.