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3.5
Dial Control
The dial control function generates dial pulses (DP). Application of ON/
OFF switching of
pulses. The following shows the basic configuration of the dial control cir-
cuit.
To generate the dial pulse, the DC loop is formed by the P relay. The dial
pulse is generated by turning this relay ON and OFF. If the S relay remains
ON while the dial pulse is being generated, the pulse waveform is influ-
enced by the DC seize circuit that is located after the S relay, and changes
as follows.
The waveform changes as follows when the S relay is turned OFF to indi-
cate that it has been shaped.
relays
is often adopted as a method of generating dial
L1
P relay
L2
Fig. 6-10 Dial Control Circuit
Influence of DC seize circuit
ON
Fig. 6-11 Waveform of Weak Pulse
Fig. 6-12 Waveform of Clear Pulse
FACSIMILE SYSTEM
+
DC cut
capacitor
S relay
DC seize
circuit
OFF
1
2
3
4
5
6
ït
çi
6–11
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