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(3) BUSY STATION CALLING TONE
852 Hz and 697 Hz signals are output from Pin 60 of IC2 alternately at intervals of 60 ms.
The signal flow is shown below.
The signal flow is shown below.
(4) DTMF SIGNAL
A DTMF tone is generated by IC2 and the signal flow is shown below.
High Group
1209 Hz
1336Hz
1477Hz
697 Hz
1
2
3
Low
770 Hz
4
5
6
Group
852 Hz
7
8
9
941 Hz
*
0
#
(5) KEY-IN TONE
An 852 Hz single tone is used as the key-in tone. A tone is generated from IC2 and is heard at the speaker.
The signal flow is shown below.
The signal flow is shown below.
CONDITION
IC8 SWA
IC8 SWB
IC8 SWC
IC8 SWD
Ringing
OFF
OFF
OFF
ON
Call Waiting
OFF
OFF
ON
OFF
Tone Dial (Handset)
ON
ON
OFF
OFF
Tone Dial (Speakerphone)
ON
OFF
ON
OFF
17
KX-T7565RU
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