Panasonic KX-TG2226B Service Manual page 60

which is modulated in an FSK (Frequency Shift Keying) * format. Data "1" is a 1200 Hz sine wave,
and data "0" a 2200 Hz sine wave.
There are two type of the message format which can be received: i.e. the single message format
and plural message format. The plural message format allows to transmit the name and data
code information in addition to the time and telephone number data.
*: Also the telephone exchange service provides other formats.
Call Waiting Caller ID
Calling Identity Delivery on Call Waiting (CIDCW) is a CLASS service that allows a customer,
while off-hook on an existing call, to receive information about a calling party on a waited call.
The transmission of the calling information takes place almost immediately after the customer is
alerted to the new call so he/she can use this information to decide whether to take the new call.
Function:
The telephone exchange transmits or receives CAS and ACK signals through each voice RX/TX
route. Then FSK data and MARK data pass the following route.
Telephone Line CN1(A, B) C11, C12 R14, R15 DSP (39~40).
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