Read Panasonic KX-TG2560B / KX-TG2560S Service Manual online
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KX-TG2560B/KX-TG2560S
10. Calling Line Identification Circuit (Caller ID)
Function:
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 “0” is a 1200 Hz sine wave, and data 1 is 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.
1st Ring
2 Sec
2 Sec
Silent interval 4 Sec
2nd Ring
2 Sec
2 Sec
0.5 S 575 mS
min 0.5 S
DATA
0.1 Vrms
STD Ring / 20Hz
Tip-Ring
Tip-Ring
DATA in
A
B
DATA out
1200Hz
=DATA "0"
=DATA "0"
1 bit=833
µ
S
2200Hz
=DATA "1"
=DATA "1"
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
201
John Smith
04
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