On 08/09/03 18:52, M_Bruno said...
By the way, noise induced into an UTP is not of
oppostite polarity on each of the two conductors!
On the contrary, it is of the same polarity,
and idealy the same magnitude and in phase (one
reason for the tight twisting)....The differential
receiver (or balun transformer) is sensitive only
to the *difference* in potential between the two
conductors. Because induced noise is induced
equally on both conductors, it is rejected.
Duh. CMRR. Common Mode Rejection Ratio. Common mode means both conductors have the same voltage in common, and the input rejects this signal -- does not amplify it.
Right.
I am obviously visiting this site too late at night. I should have recognized early on that a balun was not being used at each end of his run, so he will indeed have garbage on the line.
