Panasonic KX-TG7731S Service Manual page 18

KX-TG7731S/KX-TG7732S/KX-TG7733S/KX-TGA470S
4.6.9. Calling Line Identification (Caller ID)/Call Waiting Caller ID
Function:
Caller ID
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 data for the caller ID from the telephone exchange is sent during the interval between the
first and second rings of the bell signal. The data from the telephone exchange is a modem signal which is modulated in an FSK
(Frequency Shift Keying) * format. Data
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.
Single message format
STD Ring / 20 Hz
Tip-Ring
DATA in
A
1200 Hz
=DATA "1"
DATA out
B
month
04
Plural message format
DATA CODE NAME
201
1 is a 1200 Hz sine wave, and data
" "
1st Ring
2 sec
0.5 s 575 ms
1 bit=833 µs
day
15
1st Ring
718 ms
0.5 s
2 sec
DATA
month
John Smith
04
0 is a 2200 Hz sine wave. There are two types of
" "
Silent interval 4 sec
min 0.5 s
DATA
0.1 Vrms
2200 Hz
=DATA "0 "
hour minute
16 35
2nd Ring
day minute
hour
16 16 35
18
2nd Ring
2 sec
70 Vrms
number
2013487000
number
2013487000