| Telephone line signalling |
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Billing (metering) signal
Billing pulses are used with payphones and call metering systems.
Unlike "Pay tones", these signals are intended for the equipment, not for the user.
Also known as the Billing pulse, Metering pulse and Tax pulse.
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Country
Australia, Austria, Cameroon, Central African Republic, Côte d'Ivoire, Denmark, France, Ireland, Italy, Malta, Portugal, Rwanda, Spain, Sweden, Switzerland, Tunisia, Turkey
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Frequency/Level/Duration
12kHz/~2Vrms, differential/~125ms
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Belgium, Czech Republic, Estonia, Finland, Germany, Greece, Israel, Lesotho, Norway, Slovakia, Yugoslavia
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16kHz/~2Vrms, differential/~125ms
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Great Britain, Netherlands
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50Hz/~50Vrms, longitudinal/~160ms
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