Crosstalk occurs in twisted pair wire when a current or signal in one wire can produce an unwanted current or signal. If the two wires run parallel to each other the chance for crosstalk increases.
Mutual inductance is a consequence of an alternating current (AC) in one conductor developing a fluctuating magnetic field which induces current flow in another close-coupled conductor. In computer networking or communication, this is termed cross-talk.
The signal in the source wire is mirrored (at a lower strength) in the other. Where two conductors run parallel to one another for long lengths, the cross-talk signal is additive and can be considered as noise, where the other conductor is carrying its own signal.
True
(1) the higher the twist, the higher the throughput (2) The higher the twist, the the lower the crosstalk
the magnetic field around the adjacent pairs of wire
No
You may need a "return" for the signal. If you do not the other wire is twisted in various configurations along the length to reduce crosstalk and signal leakage. It is easier to balance capacitive loads,
Don't run too much wire together in a bundle. You can also go with STP, which is Shielded Twisted Pair and that does not have much crosstalk. There are pipes you can buy where you run cable through them that are also suppose to help.
Describe the basic construction of twisted pair wire?
twisted pair wire is limited in distance, bandwidth, and data rate.
STP - Shielded Twisted Pair is twisted to reduces crosstalk. Crosstalk is when the signal crosses wire and reduces the communication quality. Twisting the pairs reduces the signal transmission to other wires in the cable "pack". Twisting them increases the length the cable can be run. Category 5 has a usable length of 100m, 330ft.
twisted pair wire is limited in distance, bandwidth, and data rate.
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Twisted pair wire is placed inside a thin metallic shielding, similar to aluminum foil, and is then enclosed in an outer plastic casing. The shielding provides further electrical isolation of the signal-carrying pair of wires. 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 than unshielded twisted pair wire can. 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.