Twisted pair
Twisted pair cabling is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of canceling out electromagnetic interference (EMI) from external sources; for instance, electromagnetic radiation from unshielded twisted pair (UTP) cables, and crosstalk between neighboring pairs. It was invented by Alexander Graham Bell.
Explanation
In balanced pair operation, the two wires carry equal and opposite signals and the destination detects the difference between the two. This is known as differential mode transmission. Noise sources introduce signals into the wires by coupling of electric or magnetic fields and tend to couple to both wires equally. The noise thus produces a common-mode signal which is canceled at the receiver when the difference signal is taken.
This method starts to fail when the noise source is close to the signal wires; the closer wire will couple with the noise more strongly and the common-mode rejection of the receiver will fail to eliminate it. This problem is especially apparent in telecommunication cables where pairs in the same cable lie next to each other for many miles. One pair can induce crosstalk in another and it is additive along the length of the cable. Twisting the pairs counters this effect as on each half twist the wire nearest to the noise-source is exchanged.
Podcasts:
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by Dirty Penny
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by Dr. Sin
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by i5
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by Kate Ryan
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by Fear Factory
Scream Shout
by: Dirty PennyEver since I was just a boy
I've always wanted to make some noise
My daddy told me don't be fool
You're never gonna make it
Get your lazy ass to school
But I don't wanna
That's not for me
Don't care about what happened in the 1970s
I know my future is lookin' bright
And some day everybody's gonna see my name in lights
Don't tell me what to do
I ain't doin' this for you
Can you hear me scream? (scream!)
Can you hear me shout? (shout!)
Everybody can you hear me now?
Can you hear me scream? (scream!)
Can you hear me shout? (shout!)
Everybody can you hear me now?
Check out the papers
Who's number one
Oh my goodness, It's your good for nothing son
Check out my women
Check out my car
How does it feel to be the father of a star?
Look at me now
Daddy are ya proud?
Can you hear me scream? (scream!)
Can you hear me shout? (shout!)
Motherfucker can you hear me now?
Can you hear me scream? (scream!)
Can you hear me shout? (shout!)
Motherfucker can you hear me now?
I always knew that I was gonna make it someday
And now that I have, I'm gonna take over your world
[solo]
Can you hear me scream?
Can you hear me shout?
Motherfucker...
(Scream!) Can you hear me shout? (shout!)
Everybody can ya hear me now?
Can you hear me scream?
Can you hear me shout?
Everybody can ya hear me now?
Can you hear me scream?
Can you hear me shout?
Motherfucker can you hear me now?