Twisted
wires reduce interference since the bending area between the wires (which
determines the magnetic connection in the signal) is reduced. In a balanced
pair operation, the two wires usually carry equal and opposite signals
(different mode) which are combined with an add-on at the end. The common mode
sound of the two wires (mostly) dissipates in this extension because the same
wire has the same level of electromagnetic interference (EMI) which is 180
degrees out of phase. . This has the same effect as removal. Several methods
also reduce the amount of electromagnetic radiation from the cable, as well as
the weakness it causes.
The
degree of torsion (also known as torsion torsion, generally defined in torsion
per meter) is part of the specification for a particular type of cable. Where
the pairs are not twisted, one member of the pair may be closer to the source
of the other and therefore exposed to a slightly different induced electromotive
force (EMF).
Where
the torsion levels are the same, the same cables of different pairs can be
located side by side, partially eliminating the advantages of a different mode.
For this reason, it is commonly specified that, at least for cables containing
a limited number of pairs, the torsion speeds must be different.
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