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'''Over/under cable coiling''' refers to a method of storing cables that preserves the [[capacitance
▲'''Over/under cable coiling''' refers to a method of storing cables that preserves the capacitance <http://en.wikipedia.org/wiki/Capacitance> and common mode rejection <http://en.wikipedia.org/wiki/Common-mode_rejection_ratio> built in by the manufacturer with a twist in the cable, and the shielding that encases the twisted pairs within. It also keeps knots to a minimum, allows the cable to lie flat when uncoiled, and makes running the cables easier and faster.
The 'over/under' name refers to the practice of twisting the cable in one direction to make the first coil, and un-twisting it to make the next, and repeating this until all the cable is neatly coiled. Connecting the ends on the outside of the loops, or tying them in that position, insures that the ends don't pass through the loops in storage, so there are no knots when the cable is laid out.
Have someone hold a length of cable stretched gently between both of their hands. Grab the center of the cable between your thumb and fore finger and rotate the cable one direction or the other until a loop forms on either side of center. This is a microcosm of what happens as you over/under coil the cable.
The advantages of over/under are many, as discussed above. The cable isn't twisted as its coiled, nor as its laid out, so the twist applied by the manufacturer is maintained, as is the shield. No loops in the cable means no loops on the stage or floor to trip passers-by.
Straight coiling, or the practice of coiling a cable in the same direction, coil after coil, has the same result as coiling cable on a spool. If the cable comes off of the spool the same way it goes on, the 'lay' is preserved, and the cable isn't damaged. If a cable is straight coiled and then pulled from the coil, it has the same effect as coiling cable on a spool and then pulling the cable off the top of the spool, imparting a twist in the cable with every coil that is removed.
The only advantage of straight coiling cable is that it is easily taught and can be accomplished by untrained assistance.
==External links==
*[http://members.cox.net/mactop/ Video of over/under technique]
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