Read Panasonic KX-NCP1174XJ (serv.man2) Service Manual online
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KX-NCP1174XJ
5.2.5.
Power Supply
A constant-current power supply in HIC provides +30V, ring side 0V grounding to SLC. The maximum feeding current is 30mA.
5.2.6.
Dial Pulse Detection
When a telephone initiates pulse dialing, this feature detects the pulse-dialing signal.
When the telephone initiates dialing, changes in voltage is detected by the RING terminal in HIC, and this information is transmitted
to the HOOK terminal (Example: 3-pin IC200A) as Make=L/Break=H signal. This digital signal is received by CODEC IC (Example:
35-pin IC201) and recognized as dialing signal. Both 10pps and 20pps can be received. The dialing speed is analyzed by software.
When the telephone initiates dialing, changes in voltage is detected by the RING terminal in HIC, and this information is transmitted
to the HOOK terminal (Example: 3-pin IC200A) as Make=L/Break=H signal. This digital signal is received by CODEC IC (Example:
35-pin IC201) and recognized as dialing signal. Both 10pps and 20pps can be received. The dialing speed is analyzed by software.
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