Explain when shielded twisted pair wire works better than unshielded twisted pair wire.?

Question

What will be an ideal response?

Answer 1

If a twisted pair wire needs to go through walls, rooms, or buildings where there is sufficient electromagnetic interference to cause substantial noise problems, using shielded twisted pair can provide a higher level of isolation from that interference than unshielded twisted pair wire, and thus a lower level of errors. Electromagnetic interference is often generated by large motors, such as those found in heating and cooling equipment or manufacturing equipment. Even fluorescent light fixtures generate a noticeable amount of electromagnetic interference. Large sources of power can also generate damaging amounts of electromagnetic interference. Therefore, it is generally not a good idea to strap twisted pair wiring to a power line that runs through a room or through walls. Furthermore, even though Categories 3 to 6 shielded twisted pair have improved noise isolation, you cannot expect to push them past the 100-meter limit. Finally, be prepared to pay a premium for shielded twisted pair. It is not uncommon to spend an additional $1 per foot for good-quality shielded twisted pair. In contrast, Category 5, 5e, and 6 UTP often cost between $.10 and $.20 per foot.?