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參數(shù)資料
| 型號： | PBL38773/1SO |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TELECOM-SLIC, PDSO28 |
| 封裝： | PLASTIC, SOIC-28 |
| 文件頁數(shù)： | 31/64頁 |
| 文件大?。?/td> | 1052K |
| 代理商： | PBL38773/1SO |
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Ringing FlexiSLIC
PBL 38773/1
Transmission
Data Sheet
37
DS1, 2003-06-18
Figure 11
The AOV Function
Note: Observe that burst is undersampled.
5.12
Metering Applications
Subscriber Pulse Metering (SPM), also known as Advice-of-Charge signaling (AOC), is
used in several European countries to provide the subscriber with an accurate indication
of the cost of a call in progress. Pulses of an out-of-speechband signal are sent at the
same time as the speech signal down the telephone line, the rate of the pulses indicating
the cost of the call - faster pulse rates indicate a more expensive call. An electronic meter
at the subscriber counts the pulses as they arrive and indicates the call cost on a digital
display. This meter is normally wired in parallel with the telephone circuit and also
provides filtering of the signal so that the subscriber at the telephone does not hear it.
There are two frequencies used for SPM signaling: 12 kHz and 16 kHz. The frequency
used depends on the national requirements. The frequency of the SPM signal must be
quite accurate,
±0.5% is typical. Furthermore the signal must be sinusoidal with < 5%
total harmonic distortion. Pulse metering signals can be applied to the two-wire line via
1 VPeak
2.50 V
AOV
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