In all seven samples, the measured intra-pair skew in three of the pairs
was within 50ps. The fourth pair consistently exhibits at least
150ps-200ps of skew. In these samples, it is always the <underline>same
pair</underline> that consistently measures this variation.
I have checked my measurement technique and equipment to eliminate any
systematic errors. I have also cut open a cable to check for physical
length differences, etc. The cable assembly has a molded ferrite choke
on one end; I have even removed this choke and remeasured the skew.
Nothing seems to make a difference.
Any suggestions/ideas/theories will be greatly appreciated.
Silicon Image, Inc.
Tel: (408)873-3111 X132