Matches in DBpedia 2016-04 for { ?s ?p "In telecommunications signalling, metering pulses are signals sent by telephone exchanges to metering boxes and payphones aimed at informing the latter of the cost of ongoing telephone calls.The properties of these signals differ between countries, but they typically have a frequency of 50 Hz, 12 kHz or 16 kHz, and a duration of several tens or hundreds of milliseconds."@en }
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- Metering_pulse comment "In telecommunications signalling, metering pulses are signals sent by telephone exchanges to metering boxes and payphones aimed at informing the latter of the cost of ongoing telephone calls.The properties of these signals differ between countries, but they typically have a frequency of 50 Hz, 12 kHz or 16 kHz, and a duration of several tens or hundreds of milliseconds.".
- Q206294 comment "In telecommunications signalling, metering pulses are signals sent by telephone exchanges to metering boxes and payphones aimed at informing the latter of the cost of ongoing telephone calls.The properties of these signals differ between countries, but they typically have a frequency of 50 Hz, 12 kHz or 16 kHz, and a duration of several tens or hundreds of milliseconds.".