EMI, simply put, is an unwanted electrically transmitted signal. There are a number of ways to limit EMI and RFI. One way is to increase the size of the conductor wires. Another way is to improve the type of insulating material used. However, such changes increase the size and cost of the cable faster than they improve its quality. Therefore, it is more typical for network designers to specify a cable of good quality, and to provide specifications for the maximum recommended cable length between nodes.

The main kind of medium that is used today in computer data networks is EIA/TIA certified Category 5 unshielded twisted pair or UTP cable. This cable is made up of 4 twisted pairs of wires. The twists in the pairs help reduce a similar problem to EMI called crosstalk. The wire with in the different pairs is 24 gauge copper. Category 5 describes network cabling that consists of four twisted pairs of copper wire terminated by RJ45 connectors. Cat-5 cabling supports frequencies up to 100 MHz and speeds up to 1000 Mbps. Cat-5 is based on the EIA/TIA 568 Commercial Building Telecommunications Wiring Standard developed by the Electronics Industries Ass

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Approximate Word count = 776
Approximate Pages = 3 (250 words per page double spaced)