18
KX-TG7741S/KX-TG7742S/KX-TG7743S/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
"
1
"
is a 1200 Hz sine wave, and data
"
0
"
is a 2200 Hz sine wave. There are two types 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.
1st Ring
2 sec
Silent interval 4 sec
2nd Ring
2 sec
0.5 s 575 ms
min 0.5 s
DATA
0.1 Vrms
STD Ring / 20 Hz
Tip-Ring
DATA in
A
B
DATA out
1200 Hz
=DATA "1"
1 bit=833 µs
2200 Hz
=DATA "0 "
70 Vrms
month
day
hour
minute
number
2013487000
35
16
15
04
Single message format
Plural message format
1st Ring
2 sec
718 ms
2nd Ring
0.5 s
DATA
month
day
hour
minute
number
2013487000
35
16
16
DATA CODE NAME
201
John Smith
04
