21
1.1.9.
Modem and Peripheral Circuit
This circuit consists of DSP, ROM, S-RAM, Analog Front End, Analog Master and peripheral circuitry. This
modem conforms to ITU-T, V.34, V.33, V.17, V.29, V.27ter, V.21 channel 2 (FSK), T.4, and T.30. Macro order
of DSP is sent from ROM to S-RAM and is outputted. DSP transfers/receives data from Analog Front End
and serial communication. Analog Front End communicates with the line through Analog Master.
1.1.10.
Receive Signal Control Circuit
This circuit consists of Operational Amplifier, Analog Master, and its peripheral circuit. On the received sig-
nal from a line transformer (HYBSR), diffraction of signal transmission is attenuated using the hybrid circuit,
and the frequency of signal is limited to a certain band using a second LPF.
The signal is input to the analog front end via the analog SW for switching over between HYSIG and the
gain switching amplifier. 1300-Hz signal and remote signal are detected from HYSIG by switching SW1.
1.1.11.
Transmission Signal Control Circuit
This circuit consists of Operational Amplifier, Analog Master, and its peripheral circuit. On the signal trans-
mission from the analog front end, frequency of the signal is limited to a certain band using a second LPF,
and diffraction of the signal to a reception circuit is attenuated using the hybrid circuit. The signal is sent out
from the line transformer.
To Line
To Speaker
Pendulum
24.576MHz
Analog
Master
Analog
Front
End
DSP
S-RAM
ROM
CPU BUS
Modem Circuit Block Diagram
Содержание DP-3000
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Страница 156: ...156 2 28 G3B PC Board Drawing Name G3B PC Board 1 10 Model DP 2000 2500 3000...
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Страница 164: ...164 Drawing Name G3B PC Board 9 10 Model DP 2000 2500 3000 LCU LCE PCB LCU LCE PCB...
Страница 165: ...165 Drawing Name G3B PC Board 10 10 Model DP 2000 2500 3000 To SC PCB...
Страница 166: ...166 2 29 FRM PC Board Drawing Name FRM PC Board 1 1 Model DP 2000 2500 3000...
Страница 177: ...177 2 31 LANC PC Board Drawing Name LANC PC Board 1 1 Model DP 2000 2500 3000...
Страница 178: ...178 2 32 LCU PC Board Drawing Name LCU PC Board 1 1 Model DP 2000 2500 3000 SC PCB SRU PCB TEL LINE...
Страница 179: ...179 2 33 LCE PC Board Drawing Name LCE PC Board 1 1 Model DP 2000 2500 3000 To FXB PCB SRU PCB TEL...
Страница 180: ...180 2 34 SRU PC Board SRU PC Board 1 1 DZEP000027 Drawing Name Model DP 2000 2500 3000 HANDSET LCU LCE PCB...
Страница 183: ...183 2 36 HCE PC Board Drawing Name HCE PC Board 1 1 Model DP 2000 2500 3000 To LVPS To OPTION LVPS To HTC PCB...
Страница 185: ...185 2 38 MAIN LVPS PC Board 100V MAIN LVPS PC Board 100V Drawing Name Model DP 2000 2500 3000...
Страница 186: ...186 2 39 MAIN LVPS PC Board 200V MAIN LVPS PC Board 200V Drawing Name Model DP 2000 2500 3000...
Страница 187: ...187 2 40 OPTION LVPS PC Board 100V OPTION LVPS PC Board 100V Drawing Name Model DP 2000 2500 3000...
Страница 188: ...188 2 41 OPTION LVPS PC Board 200V OPTION LVPS PC Board 200V Drawing Name Model DP 2000 2500 3000...
Страница 190: ...190 2 43 Finisher Controller Circuit Diagram Finisher Controller PC Board 1 11 Drawing Name Model DP 2000 2500 3000...
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