Circuit Diagram (5/13) - Oki OKIFAX4550 Maintenance Manual

3.5 46F Circuit Diagram (5/13)
1. Block diagram
46F-PCB circuit diagram (5/13) shown the consists of Modem (33.6 kbps).
Modem consists the following functions:
• Modulation/demodulation
Modulation type:
1) ITU-T Rec. V34 (33600/31200/28800/26400/24000/21600/19200/16800/14400/12000/
9600/7200/4800/2400 bps) for G3 picture data.
2) ITU-T Rec. V17 (14400/12000/9600/7200 bps) for G3 picture data.
3) ITU-T Rec. V29 (9600/7200 bps) for G3 picture data.
4) ITU-T Rec. V27 ter (4800/2400 bps) for G3 picture data.
5) ITU-T Rec. V21 channel 2 (300 bps) for binary signals defined in ITU-T Rec. T.30.
• Automatic adaptive equalizer for G3 receive data with 300 bps data excluded.
• Generation of signal tones
• PB tone (multi-frequency tone) generation
• Detection of single tones
• D/A converter for send data (TX)
• A/D converter for receive data (RX)
• Amplitude equalizer for RX
• Selectable attenuation for TX
• Automatic gain control
Figure A.10 shows the related signals of Modem.
IC8
28.224 MHz
X3
X'tal
Modem
33.6 kbps
41309401TH Rev.4
D0 to D7
A1 to A5
V34INT
MDRST-N
V34CS
MDMRD-N
MDMWR-N
IC12
7
S
R
RP
IC12
Figure A.10 Related Signals of Modem
46F
IC2
IOGA4
CN10 CN3
A4
A2
NCU
S
R
315 /