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MFC2000 Datasheet(PDF) 375 Page - List of Unclassifed Manufacturers |
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MFC2000 Datasheet(HTML) 375 Page - List of Unclassifed Manufacturers |
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375 / 426 page  Multifunctional Peripheral Controller 2000 MFC2000 100723A Conexant 22-1 22. Calling Party Control (CPC) In some countries, after the called party is on hook, a pulse is sent to the caller party by stopping the line current of the caller party for a short time to indicate that the called party is on hook, as seen in Figure 22-1. The duration of this pulse varies widely for different countries. The purpose of having Calling Party Control (CPC) circuit is to detect the on-hook signal by sampling CPC signal. . . (o f C a ller P arty ) Ca ller P arty C alle d P arty Lin e C u rr en t CP C S ign a l O ff-H o ok On -H o ok On -H o ok S ign a l O ff-H o ok On -H o ok Figure 22-1: CPC Signal Firmware Note: In order to setup CPC circuit, the following initialization procedure must be done in the given order after both parties are off hook: 1. Write the desired threshold in CPCThreshold register 2. Select the sampling period in CPCStatCtrl register (This will clear the CPCflag and reset CPC counter to zero) Once CPC has been set up, the firmware can periodically check CPCflag by reading CPCStatCtrl register. |
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