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To help prevent cross-talk between the pairs.

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Q: Why do the wire pairs have different twist rates?
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With the use of unshielded twisted pair copper wire in a network what causes crosstalk with the cable pairs?

the magnetic field around the adjacent pairs of wire


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In twisted-pair wire how does the twist ratio affect transmission?

(1) the higher the twist, the higher the throughput (2) The higher the twist, the the lower the crosstalk


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What are the applications of twisted pair wire?

One application is when signal isolation is required. Twisted pair wire tends to self-shield for differential signals. This is because external interference induces equal currents in both conductors due to the symmetry of the twists. The differential input then cancels out the common-mode (equal on both wires) noise, allowing the desired differential signal to pass. One interesting example of this is UTP (CAT5, CAT6, etc.) cable used for ethernet cabling. If you strip the jacket off of a length of cable, you will notice (obviously) that the pairs are twisted. Look closely though, and you will notice that each pair is twisted with a different twist-per-inch than the other. If each pair had exactly the same twist, then the pairs cold 'line up' with each other, allowing crosstalk between the pairs (very bad). By varying the twist rate, crosstalk is minimized. In fact, the different twists are prime numbers, which means they never match up anywhere in the cable! Is that cool or what!


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First twist together the wires to be joined. For larger wire use lineman's pliers to apply twist. Make the twist clockwise. Then twist on the wirenut clockwise on the wires. Wirenuts are rated as to how many wires of a certain size they can hold but in general twist by hand until you can twist no more and then about 1/2 twist with pliers. If the wirenut does not get tight it is too big or internal metal portion could be clogged in some way.


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CAT5 cable is actually not able to sustain 1Gbps transfer rates, as the two pairs that are used only for grounding in CAT5, and are used for signal in CAT6, are not controlled as tightly as is necessary for full throughput. A gigabit network, finding itself connected with CAT5 cable, will degrade itself to 300Mbps.


How you can install lock wire on the bolt heads?

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What is the meaning of the term crosstalk?

Interference of signals between wire pairs.


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