unshielded twisted pair

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unshielded twisted pair

(UTP) Normal telephone wire (in the USA). It may be used for computer to computer communications, e.g. using a version of Ethernet or localtalk. It is much cheaper than standard "full-spec" Ethernet cable. It comes in five "catagories":

cat. wires transmission 1 two voice no data (telephone cable) 2 four data up to 4 Mbps 3 four data up to 10 Mbps 4 four data up to 16 Mbps 5 four data up to 100 Mbps
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twisted pair

A thin-diameter wire (22 to 26 gauge) commonly used for telephone and network cabling. The wires are twisted around each other to minimize interference from other twisted pairs in the cable. Alexander Graham Bell invented this and was awarded a patent in 1881. Twisted pairs support less bandwidth than coaxial cable or optical fiber.

Unshielded (UTP) and Shielded (STP)
Twisted pair cables are available unshielded (UTP) or shielded (STP), with UTP being the most common. Shielded twisted pair (STP) is used in noisy environments and protects against electromagnetic interference.

Stranded and Solid
Both UTP and STP come in stranded and solid wire varieties. Stranded is the most common and also very flexible for bending around corners. Solid wire has less attenuation and spans longer distances but is less flexible.

Shielded and Unshielded Twisted Pairs
ScTP (screened twisted pair), also called "foil twisted pair" (FTP), uses one overall shield for more protection than UTP but not as much as STP, which has shields around each wire pair. For an actual example of STP vs. UTP, see cable categories.

   Cable      Band-      Data#  Type       Width      Rate

 1  UTP       Analog voice
 2  UTP                 1 Mbps

 3  UTP/STP   16 MHz,   4 Mbps
 4  UTP/STP   20 MHz,  16 Mbps
 5  UTP/STP  100 MHz, 100 Mbps
 5e UTP/STP  100 MHz,   1 Gbps
 6  UTP/STP  200 MHz,  10 Gbps (<10 m)
 6a UTP/STP  500 MHz,  10 Gbps (>10 m)

 7  STP      600 MHz   10 Gbps
 7a STP     1000 MHz   40 Gbps (<15 m)

The Real Twisted Pair
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References in periodicals archive ?
The goal of the paper is substantiation of the possibility of operation in conditions of high humidity and high operating temperatures of unshielded cable based on unshielded twisted pairs with thermoplastic polyethylene insulation in a protective polyvinylchloride (PVC) jacket according to the results of accelerated aging.
A structured wiring system efficiently manages and distributes telephone, data, video, and audio signals throughout a home using Ethernet (Category 5e) unshielded twisted pair (UTP) cabling and RG 6 coaxial cabling.
Certified by Underwriters Laboratories with a unique dual certification, CCTP integrates power, video and control signals all over a single Category 6 Unshielded Twisted Pair cable.
The integration of power detection functionality in the BCM1101 will enable manufacturers to develop IP phones that can be powered through the same UTP (Unshielded Twisted Pair) cable used for Ethernet data.
The multidrop capability is referred to as a 1-Wire microLAN, a low-cost network using a PC or microcontroller as a master to communicate with many 1-Wire devices over a shared unshielded twisted pair cable up to 300 meters.
It also addresses a market trend of more applications requiring fiber, coax, and unshielded twisted pair (Category 5)."
Products used for this purpose include unshielded twisted pair, shielded twisted pair, foiled twisted pair, coaxial and fiber optic cables, as well as IDC and patch panel cross connects, and voice and data outlets.
Cable choices range from existing twisted pair phone cable to unshielded twisted pair (10BaseT), data-grade twisted pair, coaxial (Ethernet) or fiber optic.
Shielded was developed in response to the principal shortcoming of unshielded twisted pair. susceptibility to electromagnetic and radio interference.