Panasonic KX-FP342CX Service Manual page 184

Keying) format. Data "0" is a 1200 Hz sine wave, and data 1 a 2200
Hz sine wave.
There are two type of the message format which can be received:
i.e.the single data message format and multiple data message
format.
The multiple data format allows to transmit the name and data
code information in addition to the time and telephone number
data.
When there is multiple data in the unit, the name or telephone
number are displayed.
2. Circuit Operation:
The caller ID signal input from TEL LINE is processed with
MODEM (IC505).
Refer toCHECK SHEET () for the route of caller ID signal.
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