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Question :
What is the differnce between Unshielded twisted pair(UTP) and Shielded twisted pair(STP) ?

Posted by: kalyanbaidya on 10/24/2007

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Category Networking Interview Questions
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Added on 10/24/2007
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Answers:

The most commonly used form of twisted pair is unshielded twisted pair (UTP). It is just two insulated wires twisted together. any data communication cables and normal telephone cables are this type. Shielded twisted pair(STP) differs from UTP in that it has a foil jacket that helps prevent crosstalk and noise from outside source. In data communications there is a cable type called FTP (foil shielded pairs) which consists of four twisted pair inside one common shield (made of aluminium foil).



Posted by: gunjan    

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A pair of unshielded wires wound around each other is known as UTP. An UTP is a pair of copper wires wound by plastic insulater. UTP is the chipest form of the cables available for networking purposes. It is highly use in local area network LAN enviroement. And Shielded twisted pair (STP) is a pair of wires wound around each other and each pair is placed inside a protective foil wrap to protect it from crosstalk.These wires are placed in an outer copper braid to protect it from external interfarence. STP can use in environment that are near electrical units and radio towers.



Posted by: shashi kant    

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The most commonly used form of twisted pair is unshielded twisted pair (UTP). It is just two insulated wires twisted together. any data communication cables and normal telephone cables are this type. Shielded twisted pair(STP) differs from UTP in that it has a foil jacket that helps prevent crosstalk and noise from outside source. In data communications there is a cable type called FTP (foil shielded pairs) which consists of four twisted pair inside one common shield (made of aluminium foil).



Posted by: rashid    

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Shielded twisted pair contains an aluminum foil shield to avoid interference and are mainly used for backbone networks.

Unshielded do not contain any shield and are used for normal applications like LAN, telephone lines etc.



Posted by: Rahul    

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unshiellded twisted pair has low resistance against interferance whereas shielded twisted pair has high resistance towards interferance and avoids cross talks.



Posted by: surendhar s    

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The quality of UTP may vary from telephone-grade wire to extremely high-speed cable. The cable has four pairs of wires inside the jacket. Each pair is twisted with a different number of twists per inch to help eliminate interference from adjacent pairs and other electrical devices. The EIA/TIA (Electronic Industry Association/Telecommunication Industry Association) has established standards of UTP and rated five categories of wire.
Categories of Unshielded Twisted PairTypeUse
Category 1Voice Only (Telephone Wire)
Category 2Data to 4 Mbps (LocalTalk)
Category 3Data to 10 Mbps (Ethernet)
Category 4Data to 20 Mbps (16 Mbps Token Ring)
Category 5Data to 100 Mbps (Fast Ethernet)

Shielded twisted pair contains an aluminum foil shield to avoid interference and mainly used for backbone networks.



Posted by: manju rai     

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stp (shielded twisted pair)
with covring wire which is a higher quality so i can not properly use

utp (unshielded twisted pair)
category1 support only voiceused in telecommunication not data support

category2- 4 mbps
" 3- 10 "
" 4-16 "
" 5-100"
" 6-155 "



Posted by: sharat    

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