Charge pulse

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With the charge pulse ( Gbi , collective unit impulse) in analog to telephone networks information on during a connection incurred costs to the caller transmitted. In its terminal device ( telephone with built-in charge display, independent charge display , long-distance dialing coin operated telephone ), the charge pulse is filtered out of the overall signal transmitted and converted into a corresponding charge display.

The charge pulse consists of an alternating voltage with a frequency that 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: −23  dB (950mV) to +21 dB (950mV), this corresponds to a voltage of approx. 67 mV to 10.7 V.

Metering pulses are handset audible as a quiet and high-frequency beeping or crackling and can by keying transmission problems with fax - and data transmission ( modem result). To avoid these undesirable effects are

  • Corresponding filters built into the charge displays
  • separate filters available for looping into the line .

In digital telephone networks ( ISDN , GSM - and UMTS - Mobile networks ), the charge information with the be AOC - features transmitted. With ISDN, the D channel (control channel) is used for this .

Web links

Individual evidence

  1. 1 TR 110-1; Technical description of the analog dial-up connections on the T-Net / ISDN of the T-Com; August 2007