Panasonic Panafax UF-885 Service Manual page 213
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Panasonic UF-885 / 895
Dial Pulse Generator
The circuit consists of the CML relay, PLS relay and their peripheral circuits. This circuit generates dial pulses. The CPU on the
FCB PC Board controls all dial pulse generation sequences. It turns relay CML and PLS ON and OFF through the DZZSP58025
(IC60). The status of the relays during dialing is shown below. When the absence of the terminating message is confirmed by
the Off-Hook detector, the CPU turns CML relay ON to develop loop status (DC loop). After a few seconds, the CPU turns the
PLS relay On and Off to generate dial pulses, making and breaking the loop.
Dial Pulse
break
CML Relay
make
break
PLS Relay
make
Line release
break
Line status
make
DTMF Tone Generator
The circuit is incorporated in the MODEM on the FCB PC Board. The DTMF tone is conveyed to the telephone line using the
same route as the facsimile signal. The DTMF tone selection is controlled by the CPU. The relay status during dialing is shown
below.
DTMF Tone
break
PLS Relay
make
break
CML Relay
make
Line release
break
Line status
make
213
Speech
First
Speech
condition
digit
condition
Inter-digit
Prepause
pause
First
Speech
Speech
condition
digit
condition
Inter-digit
Prepause
Second
digit
Second
digit
pause
Speech
condition
Speech
condition
DTMF signal
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