February 07, 2011

RCD CAP Project - 2009-2010 - Team Project of UTP


UTP (Unshielded twisted pair) is a popular type of cable used in computer networking that consists of two twisted cooper wires twisted around each other and this kind of cable is found in many Ethernet networks and telephone systems.

UTP Comes with many different types and sizes, and it’s the most common cable used for computer networking. CAT5E is the industry standard for computer network and large telephone system.

UTP is largely use for telephone wiring and computer networking. There are some advantages to use UTP on the network; however, there are also some disadvantages to use UTP. We will also discuss the different standard on an UTP (TIA/EIA 568 A or B).

The advantage of UTP

User prefers the UTP cable because it is small and easy to install. The UTP cable is also inexpensive and can save the user’s cost. Due to it is twisted, the interference is small.

If you are using the internet at home, I would like to prefer UTP because it is for indoor environment. The STP is okay, but it is expensive and not easy to install.

The UTP is cheaper than the STP because it does not include the shield which protects the pairs of wires. Therefore, the user can save more money.

The UTP is easy to install because it is lightweight, thin, and flexible. Due to this reason, many offices and homes use UTP.

The disadvantage of UTP

The disadvantage of a UTP is that the number of networks is limited. So in other words there’s an end to how many computer stations can be linked. Also UTP is unsuitable for long distance networks only a short distance about only 100 meters.

Another disadvantage is the electromagnetic interference depending on pair twisting staying intact during installation. The twisted cable pairs usually have stringent requirement for max pulling tension, as well as minimum bend radius. The fragility of the twisted cables is an important part in ensuring the cable’s performance. Electromagnetic interference is a major problem with a UTP.

Another disadvantage is in video applications that send information across multiple parallel signal wires. A UTP creates signaling delays which creates color defects, or “ghosting, due the image component not all aligning correctly when recombined with the display device.”

This happens because twisted pairs with in the cable use a different number of twists per meter. This “prevents common mode cross talk between pairs with identical number of twists.”

Different standards on the termination an UTP (TIA/EIA 568 A or B)

Ethernet was created in 1920 and used 25 pair color code for the phone system with unshielded pair cable. UTP cable is also used in computer networking.

The UTP uses RJ-45 port and it has two way of making UTP. One is EIA/TIA 568A and another one is EIA/TIA 568B. They are different because P3 is instead of the P2 position. EIA/TIA 568B can work better with the phone because of the better data flow, but it is for commercial. EIA/TIA 568A is sufficient for residential, but its data flow is not as good as EIA/TIA 568A.


Although there are disadvantages on UTP, it is still popular for indoor use, e.g. school, office, and home. Due to the advantages, many users at these places in the world use the UTP to connect the Local Area Network and Internet.

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