Media Interference
Depending on where network cabling (commonly referred to as media) is installed, interference can be a major consideration. Two types of media interference can adversely affect data transmissions over network media: electromagnetic interference (EMI) and crosstalk.
EMI is a problem when cables are installed near electrical devices, such as air conditioners or fluorescent light fixtures. If a network media is placed close enough to such a device, the signal within the cable might become corrupt. Network media vary in their resistance to the effects of EMI. Standard UTP cable is susceptible to EMI, whereas fiber cable with its light transmissions is resistant to EMI. When deciding on a particular media, consider where it will run and the impact EMI can have on the installation.
A second type of interference is crosstalk. Crosstalk refers to how the data signals on two separate media interfere with each other. The result is that the signal on both cables can become corrupt. As with EMI, media varies in its resistance to crosstalk, with fiber-optic cable being the most resistant.