Noise Noise is undesirable electrical activity in a conductor, in LAN environments this may typically include AC transmission lines, fluorescent light fixtures, industrial equipment and lifts. Noise problems also occur when other wire pairs in the same sheath are tested for non - LAN applications. Often noise problems can be corrected by moving the cable away from the source or removing the source. RFI is characterised by higher frequencies, lower amplitudes and comes from sources such as cellular phones, radio, TV and high frequency switching power supplies. Capacitance Capacitance is a measure of the total amount of charge stored between two electrical components.
High values have a detrimental effect on communication signals, especially at high frequencies.
There has been endless confusion on what defines the speed of a network. A bit is the smallest piece of information that can be processed by a computer, it can take up to eight bits to make up one character. While higher frequencies can mean faster networks a truer measurement of communication speed is bit rate or Mbps. Bit rate does not necessarily equal frequency, although for some systems they match closely.