Metering pulse

The charge pulse ( Gbi, bargaining unit pulse) in analog telephone networks information on the costs incurred during a connection charges are transferred to the caller. In the terminal ( telephone with built Gebührenanzeiger, independent Gebührenanzeiger, Fernwahlmünzfernsprecher ) of the charge pulse is filtered out of the total signal transmitted and converted into a corresponding charge indicator.

The metering pulse consists of an alternating voltage with a frequency which is above the voice frequency range of 300 to 3400 Hz. The data of the charge pulse:

  • Frequency: In Germany 16 kHz ( ± 80 Hz), in Austria and Switzerland 12 kHz
  • Length: 78 - 170 ms
  • Power level: -21.3 dBm to 22.8 dBm

Charge pulses are used in the handset audible as a quiet and high-frequency crackling and can keying transmission problems with fax and data transfers result ( modem). To avoid these undesirable effects are

  • Incorporated in the charges indicators corresponding filter
  • Separate filter for inserting into the line available.

In digital telephone networks (ISDN, GSM and UMTS mobile networks ) the cost information with the AOC - performance features. ISDN is used, the D channel ( control channel ).

User (telecommunications) Integrated Services Digital Network Mobile telephony
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