Any device that is used to prevent undesirable electrical signals from damaging computer, networking, or telecommunication equipment and to guard against data loss due to electrical noise, sags, and surges. Sometimes called a line shaper, a line conditioner can also ensure that the parameters of the signal remain within specifications for the medium or interface being used, even over excessively long or noisy transmission lines.
By maintaining signal integrity, line conditioners can allow communication devices to function at higher throughput rates.
Line conditioners contain circuitry that enables them to filter out noise caused by electromagnetic interference (EMI) and other sources. They also contain isolation transformers that electrically isolate the circuitry from unwanted DC voltages, impedance-matching circuitry for reducing unwanted signal reflections, and surge suppressors to guard against high-voltage surges (6000 volts or more) caused by lightning strikes and power failures. Line conditioners can also correct sags (drops) in voltages caused by momentary brownouts, but they are not meant to replace or supply power during a power loss. They often include fault indicators and audible alarms.
You can use line conditioners in the following places:
Line conditioners can often improve analog modem transmission speeds, enabling high-speed modems to function at their maximum transmission speeds over noisy telephone lines in the local loop.