Panasonic KX-TS580MXB, Service Manual

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KX-TS580MXB/KX-TS580MXW/KX-TS580MXR/KX-TS580MXC/KX-TS580MXJ
4.2.4. Caller ID Detect Circuit
4.2.4.1. Function (FSK signal)
The caller ID is a chargeable ID which the user of a telephone circuit obtains by entering a contract with the telephone company
to utilize a caller ID service. For this reason, the operation of this circuit assumes that a caller ID service contract has been
entered for the circuit being used.
The Caller-ID data from exchange is supplied to the telephone using the method of FSK and displayed on LCD of the unit.
• FSK (Frequency Shift Keying) format
4.2.4.2. Circuit operation
Caller ID
Caller ID signal is sent through the circuit via the following path:
LINE
→
C501/C502
→
C551/C552
→
R551/R552
→
R553/R554
→
IC801 (pin 92, 93)