256
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.
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.
CML Relay
PLS Relay
Line release
Line status
make
break
Speech
condition
First
digit
Second
digit
Prepause
Inter-digit
pause
make
break
make
break
Speech
condition
Speech
condition
Dial Pulse
PLS Relay
CML Relay
Line release
Line status
make
break
Speech
condition
First
digit
Second
digit
Prepause
Inter-digit
pause
make
break
make
break
Speech
condition
Speech
condition
DTMF signal
DTMF Tone
Summary of Contents for Panafax DX-2000
Page 2: ......
Page 27: ...27 9 1 Screw 19 10 Release two Latch Hooks 11 Remove the SNS Assembly 121 9 10 11 ...
Page 49: ...49 2 15 Screw Identification Template ...
Page 57: ...57 3 7 3 Option Cassette Circuit 555 748 728 744 928 953 730 731 731 952 944 930 931 931 ...
Page 58: ...58 3 7 4 LAN Control Circuit 522 CN50 1102 1104 1101 N C N C RD N C N C RD TD TD ...
Page 59: ...59 3 7 5 Page Description Language Printer Interface Kit ...
