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Telemetry
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==={{anchor|Electrical energy providers}}Energy providers=== In some countries, telemetry is used to measure the amount of electrical energy consumed. The electricity meter communicates with a [[concentrator]], and the latter sends the information through [[GPRS]] or [[GSM]] to the energy provider's server. Telemetry is also used for the remote monitoring of substations and their equipment. For data transmission, phase line carrier systems operating on frequencies between 30 and 400 kHz are sometimes used.
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