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Topic: Twisted pair

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	What is twisted pair? - a definition from Whatis.com
		This is known as shielded twisted pair (STP).
		Twisted pair is now frequently installed with two pairs to the home, with the extra pair making it possible for you to add another line (perhaps for modem use) when you need it.
		Although twisted pair is often associated with home use, a higher grade of twisted pair is often used for horizontal wiring in LAN installations because it is less expensive than coaxial cable.
	searchdatacenter.techtarget.com /sDefinition/0,,sid80_gci213234,00.html (514 words)

	NationMaster - Encyclopedia: Twisted pair (Site not responding. Last check: )
		Twisted pair cabling is a form of wiring in which two conductors are wound together for the purposes of canceling out electromagnetic interference (EMI) from external sources and crosstalk from neighboring wires.
		Twisted pair cabling is often used in data networks for short and medium length connections because of its relatively lower costs compared to fiber and coaxial cabling.
		Twisted pair’s susceptibility to the electromagnetic interference greatly depends on the pair twisting schemes (usually patented by the manufacturers) to stay intact during the installation.
	www.nationmaster.com /encyclopedia/Twisted-pair (2619 words)

	Twisted Pair Cabling Houston
		Unshielded Twisted Pair (UTP) has been designed for use in voice applications and local area networks.
		Over 99% of our copper installations are UTP versus shielded twisted pair (STP), which is rarely used.
		STP: (Shielded Twisted Pair) A shielded cable is an electrical cable of one or more insulated conductors enclosed by a shield that may be composed of braided strands of copper.
	www.actcabling.com /twisted-pair-cabling-houston.htm (691 words)

	What is Unshielded Twisted Pair? - a definition from Whatis.com - see also: UTP
		Twisted pair is the ordinary copper wire that connects home and many business computers to the telephone company.
		Twisted pair comes with each pair uniquely color coded when it is packaged in multiple pairs.
		Although twisted pair is often associated with home use, a higher grade of twisted pair is often used for horizontal wiring in LAN installations because it is less expensive than coaxial cable.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci214167,00.html (493 words)

	Linux Ethernet-Howto: Cables, Coax, Twisted Pair
		The second drawback is that if you have a big loop of machines connected together, and some bonehead breaks the loop by taking one cable off the side of his tee, the whole network goes down because it sees an infinite impedance (open circuit) instead of the required 50 ohm termination.
		Twisted pair networks require active hubs, which start around $50, and the raw cable cost can actually be higher than thinnet.
		Differential signal pairs must be on the same twisted pair to get the required minimal impedance/loss of a UTP cable.
	www.faqs.org /docs/ethernet/Ethernet-HOWTO-5.html (1068 words)

	Verizon Learning Center - Last Mile Telecommunications Infrastructure - Twisted Pair and ISDN - Page 4 of 7
		The characteristics of the twisted pair cables are significant, since they arguably constitute the greatest asset of an established telecommunications carrier.
		Twisted pair underground cables are perfectly adequate for reliable voice communications, provided they are protected from damage by excavation and ingress of water.
		Ideally, every analogue telephone would have its own twisted pair copper cable to either the exchange or to a Remote Access Unit, which is linked by fiber to the exchange which may be hundreds of kilometers distant.
	www22.verizon.com /about/community/learningcenter/articles/displayarticle1/0,1727,1139z4,00.html (941 words)

	Twisted Pair Testing
		In this case, all points that must be tested for twisted pairs must be connected through coax cable and the shields of all the coax wires must be connected together and grounded to the tester chassis.
		In poor-quality twisted pair cabling each pair is not shielded, the wires have less than 2 twists per inch and there is a general twisting lay to the bundle every foot or so for the length of the cable.
		By using a couple of feet of high quality twisted pair cabling matching the twist pattern of the cable to be tested you can increase the length of the whole assembly being tested thus allowing the tester to get a "better read" on the cable.
	www.cirris.com /testing/twisted_pair/twist.html (1222 words)

	Smart Computing Encyclopedia Entry - twisted pair (Site not responding. Last check: )
		A type of wire in which two strands of insulated copper wire are twisted about each other in order to cut down interference from other wires within the cable.
		Although many grades of twisted pair wire are available, there are only two basic types: UTP (unshielded twisted-pair) and STP (shielded twisted-pair).
		The difference is that STP uses an RF-insulating shield around the four wire pairs to decrease further susceptibility to electromagnetic interference.
	www.smartcomputing.com /editorial/dictionary/detail.asp?guid=&searchtype=1&DicID=19345&RefType=Encyclopedia (269 words)

	Shielded Twisted Pair Cable ( Shielded Twisted Pair) Definition
		Shielded twisted pair is a special kind of copper telephone wiring used in some business installations.
		An outer covering or shield is added to the ordinary twisted pair telephone wires; the shield functions as a ground.
		Twisted pair is the ordinary copper wire that connects home and many business computers to the …
	www.bitpipe.com /tlist/Shielded-Twisted-Pair-Cable.html (300 words)

	Twisted pair (Floyd Davidson)
		Twisted pair transmission lines provide noise immunity compared to a non-twisted pair (generally in excess of 60 dB of immunity, which is a _huge_ amount).
		The two twisted wires are coupled more tightly >>than two wires in a non-twisted cable (which would also tend >>to use thicker insulation specifically to separate the >>conductors farther, as opposed to twisted pairs where closer >>proximity is made up for by noise immunity due to common mode >>rejection provided by balanced circuits).
		Twisted pair cable, to counter the physical bulk increase caused by the twist, will use thinner insulation, which is effective because common mode rejection is the primary noise reduction mechanism for balanced circuits and the capacitance between conductors does not cause the significant increase in noise which would be seen with a non-balanced circuit.
	yarchive.net /phone/twisted_pair.html (4937 words)

	Twisted Pair
		Two insulated copper wires twisted together with the "twists" or "lays" varied in length to reduce potential signal interference between the pairs.
		Where cables comprise more than 25 pairs, they are usually bundled together and wrapped in a cable sheath.
		Twisted pair is the most commonly used medium for connecting telephones, computers and terminals to PABXs, supporting speeds up to 64kbits/sec.
	www.ericsson.com /ericsson/support/gloss_articles/twisted_pair.shtml (61 words)

	Teledatacom Glossary: Twisted Pair
		To reduce crosstalk or electromagnetic induction between pairs of wires, two insulated copper wires are twisted around each other.
		Since some telephone sets or desktop locations require multiple connections, twisted pair is sometimes installed in two or more pairs, all within a single cable.
		For some business locations, twisted pair is enclosed in a shield that functions as a ground.
	www.artesyncp.com /resources/glossary/twisted-pair.html (165 words)

	Twisted pair cables ...
		Characteristic impedance of twisted pair is determined by the size and spacing of the conductors and the type of dielectric used between them.
		When many twisted pairs are put together to form a multi-pair calbe, individual conductors are twisted into pairs with varying twists to minimize crosstalk.
		For example, one conductor in pair 3 is connected to pin 1 on one side and to pin 2 on the other, while the second conductor is connected between pin 2 and pin 1.
	www.epanorama.net /documents/wiring/twistedpair.html (12423 words)

	Twisted Pair
		Dependend on the tightness of the twists and the amount of twistes the difference could be up to 20% of the actual copper length.
		Twisted pair cable is mostly used in environments where the signals are balanced.
		Due to the fact that one twisted pair is used for the A and B lead an induced signal will not cause much trouble.
	ckp.made-it.com /twistedpair.html (344 words)

	Twisted Pair, 16 Port Hub Twisted Pair Receiver + 1u Rack Mount Passive, 4x Bnc Jack To 1 X Rj45 Jack, 4x Rj, 9 Channel ...
		Output Connector : RJ-45x1 Transmission Distance : 600M Cable for RJ-45 : Twisted pair CAT5 Dimensions : 66x23x19 * Pictures and specifications are subject to change without prior notice
		Output Connector : Terminal Block Transmission Distance : 600M Cable for RJ-45 : Twisted pair CAT5 Dimensions : 66x23x19 * Pictures and specifications are subject to change without prior notice
		Category 5 Twisted Pair Kit (2pcs), Terminal Block, 2.4 Km Video I/P 1Vp-p75O BNC DC O/P for motion sensor 12V DC 50mA Power supply 12V DC DC O/P for CCD Camera 12V Regulated 300mA max Current 40mA Dimension 49 x 42 x 45 15-W103R Video O/P 1Vp-p75nBNC Power I
	www.cctv4sale.com /products.cfm/Twisted-Pair (362 words)

	Cyclops 2 Twisted Pair Cable Stripper - 15010
		Protect your shielded or unshielded twisted pair cable from being nicked.
		Pull back on the finger hole of the Cyclops 2 Twisted Pair Cable Stripper and place the cable inside the blade hole.
		Additional cable strippers are also available for RG6 coax cable, RG6 quad coax cable, and RG59 coax cable (all sold separately).
	www.smarthome.com /89252.html (182 words)

	Verizon Learning Center - Last Mile Telecommunications Infrastructure - Twisted Pair and ISDN - Page 5 of 7
		The fact that a significant percentage of phone services do not involve a dedicated copper pair to the exchange or Remote Access Unit needs to be borne in mind when considering the deployment of technologies such as ADSL which rely on an uninterrupted copper pair.
		The electronics of the phone is powered by the 50 volt DC 'battery' voltage on the twisted pair line, and the pair simultaneously carries analogue (smoothly changing) audio signals both to and from the phone.
		The microphone drives an audio signal onto the pair towards the exchange, and the earpiece is driven by the audio signal that is received from the exchange.
	www22.verizon.com /about/community/learningcenter/articles/displayarticle1/0,1727,1139z5,00.html (991 words)

	* Twisted Pair - (Telecom): Definition
		A digital line that uses the existing twisted pair copper telephone network to achieve speeds of up to 6 megabits per second up to 12000 feet, or 1.5 megabits per second up to 18000 feet.
		Note 1: Ethernet is a standard for using various media, such as coaxial cables, unshielded twisted pairs, and optical fibers.
		Note 2: A common of loading coils is to improve the voice-frequency amplitude response characteristics of twisted pairs.
	en.mimi.hu /telecom/twisted_pair.html (139 words)

	TWISTED PAIR (Site not responding. Last check: )
		ETERNITY 5 would set this off when Twisted Pair, in addition to rocking Center City Arena all night long, acted as the timekeepers, bringing partygoers into the next Millenium with their awe-inspiring midnight-countdown sequence.
		Twisted Pair continued to dazzle partygoers throughout the Capital District, appearing at a string of parties: EDMS's VOLUME 13, Y2K's INTERMISSION, Double Impact's FROSTBITE, HEADRUSH, GHOULASH and ASCENSION.
		Twisted Pair has established themselves as Albany's Premier Visual Team and is ready to branch out into the tri-state area and beyond..
	www.twistedpairvisuals.com /who.html (452 words)

	Chapter 4: Cabling
		Each pair is twisted with a different number of twists per inch to help eliminate interference from adjacent pairs and other electrical devices.
		Shielded twisted pair (STP) is suitable for environments with electrical interference; however, the extra shielding can make the cables quite bulky.
		Shielded twisted pair is often used on networks using Token Ring topology.
	fcit.coedu.usf.edu /NETWORK/chap4/chap4.htm (1303 words)

	Twisted Pair Goes Supersonic
		Using slightly different twist pitches from one pair to another in a cable means that wires in adjacent pairs don’t have the same proximity to each other throughout the length of the cable.
		Besides twisting the two wires in a pair, the four pairs typically making up a data cable are twisted around each other in a specific manner.
		The capacitance to ground of a twisted pair is increased by a shield, but the added capacitance is very stable and improves the balance of the twisted pair with respect to an interfering common-mode signal.
	www.evaluationengineering.com /archive/articles/1101twist.htm (2249 words)

	The Seattle Times: Business & Technology: Twisted Pair wins $9 million in venture capital to expand
		Twisted Pair was founded in 1999 by Shaun Botha and Derick Clack, longtime friends from South Africa who moved to Seattle from New Jersey after working closely with Seattle software company WRQ (now Attachmate) as consultants.
		Twisted Pair plans to hire about 20 employees by the end of the year to bring the staff to 50.
		What makes Twisted Pair even stronger, he said, is that it partners with all of these companies and more.
	seattletimes.nwsource.com /html/businesstechnology/2003280533_twistedpair29.html (734 words)

	CCNA: Network Media Types > Twisted-Pair Cable (Site not responding. Last check: )
		The pairs are twisted to provide protection against crosstalk, the noise generated by adjacent pairs.
		To further reduce crosstalk between the pairs in UTP cable, the number of twists in the wire pairs varies.
		The four pairs of wires then are wrapped in an overall metallic braid or foil, usually 150-ohm cable.
	www.ciscopress.com /articles/article.asp?p=31276 (1061 words)

	Td Communications :: Twisted Pair
		Unshielded Twisted Pair (UTP) has been designed for use in voice applications and local area networks.
		In a balanced system, there is very little radiation of EMI since the external field from one conductor is effectively canceled by the external field from the other conductor of the pair.
		Generally, the more twists per foot of cable, the better the cable is electrically balanced.
	tdcommunications.com /twisted.html (261 words)

	Twisted-pair
		The Twisted Pair cost nearly twice as much as my AQ Midnight, so my hopes for the them were high.
		Gordon Holt actually said, "If the midrange isn’t ‘right’ nothing else matters." After spending extended listening time with Twisted Pair Designs loudspeaker cables and interconnects, I heard a lot of midrange "rightness." In fact, these cables’; (and their sonic sibling interconnects’) greatest strength was their midrange, but their weaknesses were their highs and lows.
		I’m smart enough to remain skeptical about "my" cables, and I’m not willing to say that the Twisted Pair were not "as good," but I have to say that they are not "right" for my particular system.
	www.positive-feedback.com /ambackissues/Twisted-pair.htm (2595 words)

	Wiring Tutorial for 10BaseT Unshielded Twisted Pair (UTP) (Site not responding. Last check: )
		Typically the solid is used to run through walls and ceilings and the flex is used to make drop cables (the cable from the wall plate to the desktop computer) and patch cables (the cable from the patch panel to the hub).
		The IEEE Specification for Ethernet 10BaseT requires that two twisted pairs be used and that one pair is connected to pins 1 and 2, and that the second pair is connected to pins 3 and 6.
		Yes that is right - pins 4 and 5 are skipped and are connected to one of the remaining twisted pairs.
	www.netspec.com /helpdesk/wiredoc.html (895 words)

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