If your referring to cat5, cat5e, cat6 wire, what you have is two wires that carry voltage, when voltage travels on wire it creates a magnetic field around the wire, you have two wires that carries voltages and both wires are creating a magnetic field... then you have eddy currents... take two magnetic and bring them close together and you disturb there magnetic fields or crossing of eddy currents as you disturb there magnetic field you feel the resistance or how it becomes harder to bring them closer together. The resistance of the magnetic fields is the same on two conductors they resist flow. So if you twist the two pairs together somehow it helps to cancel or reduce the repulsion of the fields and allow the voltage to flow better or more efficiently. the tighter or more twist per length the better.
What Are Two Advantages of Using Twisted Pair Cabling Over Coaxial Cabling on a Network?
By Frank Gates, eHow Contributor | updated December 20, 2011
Twisted pair and coaxial cables are types of network cable. Another type is fiber optic cable. The primary job of network cables is to transport data over a network. A network may consist of a computer to a router, a router to a peripheral device such as a printer, or a router to another router. It is essential that data is not corrupted by outside interferences, such as electromechanical interference (EMI) or radio frequency interference (RFI). Another important component of transmission cables is their ability to transfer data quickly. The faster the network can perform, the more data it can move, and the happier the network users will be.
UTP and STP are twisted cables, the advantage of this is: it cancels out some of the electrical interference.
Shielded twisted pair wires are less susceptible to electrical interference caused by nearby equipment or wires and, in turn, are less likely to cause interference themselves. Because it is electrically "cleaner," shielded twisted pair wire can carry data at a faster speed. The disadvantage of shielded twisted pair wire is that it is physically larger and more expensive than twisted pair wire, and it is more difficult to connect to a terminating block.
If the cat6 cable is not twisted then the data can interference from other electomagnetic waves.if twisted the pair its cancell the positive and negative charges with opposit direction.
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Twisted pairs
The most obvious difference is their transfer capability. CAT5 has four pairs of twisted copper wire and supports up to 100m of Fast Ethernet (100Mbps) transfers. Although CAT5 has four twisted pairs, it only makes use of two pairs. CAT6 also has four pairs of twisted copper wire which supports Gigabit Ethernet (1000 Mbps) of up to 100m. Unlike CAT5, CAT6 takes advantage of all four pairs. CAT6 has a 2x transfer rate compared to CAT5 but due to the higher price tag of CAT6.
It improves performance It maintains strong signals over longer distances It reduces electromagnetic interference and emissions
An STP cable is a Single Twisted Pair cable, and it has a few advantages. One advantage is that it is more secure than other cables. It also transmits faster, and has a greater resistance to interference.
One primary advantage of UTP over STP or Fiber is cost. Twisted pair is also more simple to use in many applications (telephone, serial data, etc.) than fiber.
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Shielded twisted pair wires are less susceptible to electrical interference caused by nearby equipment or wires and, in turn, are less likely to cause interference themselves. Because it is electrically "cleaner," shielded twisted pair wire can carry data at a faster speed. The disadvantage of shielded twisted pair wire is that it is physically larger and more expensive than twisted pair wire, and it is more difficult to connect to a terminating block.
A twisted cable is two conductors of a single circuit that are twisted together. They are twisted together to cancel out electromagnetic interference.
Twisted is the verb.
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Twisted. E.g Don't get it twisted