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Potential interference, for example, has long been a concern of groups Different types of powerline communications use different frequency bands, depending on the signal transmission characteristics of the power wiring used
For example, a can use a PLC channel to trip a line if a fault is detected between its two terminals, but to leave the line in operation if the fault is elsewhere on the system Powerline Communication: Potential and Critical System, Existing Technologies and Prospects for Future Development• Filtering devices are applied at substations to prevent the carrier frequency current from being bypassed through the station apparatus and to ensure that distant faults do not affect the isolated segments of the PLC system

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Since the power distribution system was originally intended for transmission of at typical frequencies of 50 or 60, power wire circuits have only a limited ability to carry higher frequencies.

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and distance limits vary widely over many power line communication standards
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Higher data rates generally imply shorter ranges; a operating at millions of bits per second may only cover one floor of an office building, but eliminates the need for installation of dedicated network cabling
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" A number of difficult technical problems are common between and power line communication, notably those of radio signals operating in a crowded environment
The propagation problem is a limiting factor for each type of power line communications Basics Power line operate by impressing a modulated carrier signal on the wiring system
Frequencies used are in the range of 24 to 500 kHz, with transmitter power levels up to hundreds of These signals may be impressed on one conductor, on two conductors or on all three conductors of a high-voltage AC transmission line

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Long haul, low frequency Utility companies use special coupling to connect radio transmitters to the power-frequency AC conductors.

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Low-frequency about 100—200 kHz carriers impressed on high-voltage transmission lines may carry one or two analog voice circuits, or telemetry and control circuits with an equivalent data rate of a few hundred bits per second; however, these circuits may be many miles long
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Several PLC channels may be coupled onto one HV line
These circuits are used for control of switchgear, and for protection of transmission lines

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