Unshielded Twisted Pair Cables

8/13/2019 Unshielded Twisted Pair Cables

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MAKERERE UNIVERSITY

SCHOOL OF COMPUTING ANDINFORMATICS

DEPARMENT OF NETWORKS

MASTERS DATA COMMUNICATION AND SOFTWARE ENGINERING

Communications S st!ms

COURSE CODE" MCN #$%#

Assi&nm!nt

NAME" ANDIMA GEOFFREYREG NO" '%$()HD%*)+#+USTUD NO" '%#%%%,-'



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UTP is a four-pair wire medium used in a variety of networks. Each of the eight copper wires in the UTPcable is covered by insulating material. In addition, each pair of wires is twisted around each other. Thistype of cable relies on the cancellation effect produced by the twisted wire pairs to limit attenuationcaused by electromagnetic interference and radio fre uency interference

.

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!peed and throughput"#$ to #$$$ %bps

&verage cost per node"least e'pensive

%edia and connector si(e"!mall

%a'imum cable length"#$$ m )short*

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1) The main advantage of a UTP cable is its capability to cancel interference, because the twisted-wire pairs limit signal deprivation from electromagnetic interference )E%I* and radio fre uencyinterference )+ I*.

2) Unshielded Twisted-Pair )UTP* !tructured Premise abling permits many communication protocols to reside in the same wire bundle. E'amples include voice, data, and T video andcontrol.

3) Unshielded Twisted Pair system is olor-coded cabling.

4) & good UTP system gives better interference re/ection than coa'ial cable.

5) heaper and far easier to splice

6) It is easy to install and is less e'pensive than other types of cables.



7) It is used most often.

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1) It is more likely to pick up interference than other types of cables.

2) The distance between signal boosts is shorter for UTP than it is for coa'ial and fiber optic cables.This means that you must strengthen the signal more often.

There are 0 different types of categories of UTP cables as listed below.

T 8! Data Rat!s Us!

Category 1 ------- oice 1nly )Telephoneable*

Category 2 2ata to 3 %bps 4ocal Talk

Category 3 2ata to #$ %bps Ethernet

Category 4 2ata to 5$ %bps !ome Token +ings

Category 5 2ata to #$$ %bps Ethernet and ast Ethernet

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UTP cables are terminated with standard connectors )plugs and /acks* or punch downs. The plug6/ack isoften referred to as a 7+8-307, but that is really a Telco designation for the 7modular 9 pin connector7terminated with a U!1 pin out used for telephones. The male connector on the end of a patch cord iscalled a 7plug7 and the receptacle on the wall outlet is a 7/ack.7

These terminations are called 7I2 7 for 7insulation-displacement connections,7 since the wires are held inknife-edge terminations that slice through the insulation and dig into the copper wire, forming a tight seallike this.

&ll I2 connections re uire untwisting a small amount of each pair to get the wires into the contacts. Inorder to minimi(e crosstalk and return loss problems, it:s necessary to keep the amount of wire in each

pair untwisted and minimi(e the amount of cable /acket removed. or at 060e6;6;& cable, the ma'imumamount of untwisted wire is specified as $.07 )#< mm* but its good practice to minimi(e the amount ofuntwist and the length of cable /acket removed.

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!TP is typically used for Token-+ing networks, where it is commonly referred to I=% Type # )or 5, <, ;,

9, and so many others*. !TP cable uses cancellation, shielding, and twisted wires. The twisted wires andshielded twisted-pair cables allow for more cancellation of electrical interference than the unshieldedtwisted-pair cables. Each pair of wires is wrapped in metallic foil and those four pairs of wires arewrapped in an overall metallic foil.

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The following summari(es the features of !hielded Twisted Pair cables>

!peed and throughput"#$ to #$$ %bps

&verage cost per node"moderately e'pensive

%edia and connector si(e"%edium to large

%a'imum cable length"#$$ m )short*

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1) The shielding provides more protection from all types of incoming e'ternal interference.

2) The shielding minimi(es outgoing radiated electromagnetic waves that could potentially causenoise in other devices.

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1) It is more e'pensive and difficult to install than UTP.

2) It cannot be run as far as coa'ial cable or optical fiber without the signal being repeated.

3) The metallic shielding materials in !TP need to be grounded at both ends. If improperly groundedor if there are any breaks in the shielding of the cable it can suffer from noise problems. Theshield will act like an antenna picking up unwanted signals in the case that it is not properlygrounded or the shielding has breaks in it.

Coa;ia/ Ca3/!

oa'ial cable consists of two conductors. The inner conductor is held inside an insulator with theother conductor woven around it providing a shield. &n insulating protective coating called a /acketcovers the outer conductor.

Coa;ia/ Ca3/!



The outer shield protects the inner conductor from outside electrical signals. The distance between theouter conductor )shield* and inner conductor, plus the type of material used for insulating the innerconductor determine the cable properties or impedance. Typical impedances for coa'ial cables are ?01hms for T cable, 0$ 1hms for Ethernet Thinnet and Thicknet. The e'cellent control of the impedancecharacteristics of the cable allow higher data rates to be transferred than with twisted pair cable.

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The following summari(es the features of coa'ial cables>

!peed and throughput"#$ to #$$ %bps

&verage cost per node"Ine'pensive

%edia and connector si(e"%edium

%a'imum cable length"0$$ m )medium*

A07anta&!s o6 Coa;ia/ Ca3/!

1) It has better shield against electromagnetic interference than twisted pair cable, so it can spanlonger distance at higher data bits per second )bps*.

2) It can be used for both analog and digital data transmissions. or analog data transmission, ?0-ohm broadband coa'ial is used and for digital transmission, 0$ @ ohm baseband cable is used.

3) It is ine'pensive as compared to twisted pair wires and UTP cables but easy to handle.



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Unshielded Twisted Pair Cables