32
KX-FC265GR-T
6.6.
Modem Section
6.6.1.
Function
The unit uses a 1 chip modem (IC3) that serves as an interface between the control section for FAX transmission and reception
and the telephone line. During a transmitting operation, the digital image signals are modulated and sent to the telephone line.
During a receiving operation, the analogue image signals which are received via the telephone line are demodulated and con-
verted into digital image signals. The communication format and procedures for FAX communication are standardized by ITU-T.
This 1 chip modem (IC3) has hardware which sends and detects all of the necessary signals for FAX communication.
It can be controlled by writing commands from the CPU (IC10: inside ASIC) to the register in the modem (IC3).
This modem (IC3) also sends DTMF signals, generates a call tone (from the speaker), and detects a busy tone and dial tones.
Overview of Facsimile Communication Procedures (ITU-T Recommendation):
1. ON CCIT (International Telegraph and Telephone Consultative Committee)
The No. XIV Group of CCITT, one of the four permanent organizations of the International Telecommunications Union (ITU),
investigates and make recommendations on international standards for facsimiles.
2. Definition of Each Group
• Group I (G1)
Official A-4 size documents without using formats which reduce the band width of a signal are sent over telephone lines.Deter-
mined in 1968.
Transmission for about 6 minutes at a scanning line density of 3.85 lines/mm.
• Group II (G2)
Using reduction technology in the modulation/demodulation format, an A-4 size document is sent at an official scanning line den-
sity of 3.85 lines/mm for about 3 minutes.
Methods to suppress redundancy are not used.
Determined in 1976.
• Group III (G3)
Method of suppressing redundancy in the image signal prior to modulation is used. An A-4 size document is sent within about
one minute.
Determined in 1980.
• Group IV (G4)
Transmission is via the data network. A method is provided for suppressing redundancy in signals prior to transmission, and
error-free reception of transmission is possible.
The scope of these facsimile applications is not limited simply to transmission of written statements. Through symbiotic linkages
with other communication methods, it can be expected to expand to include integrated services.
Содержание KX-FC265GR-T
Страница 13: ...13 KX FC265GR T 4 2 1 2 Error Messages Report 4 2 2 Cordless Handset ...
Страница 22: ...22 KX FC265GR T 6 4 2 Block Diagram ...
Страница 24: ...24 KX FC265GR T ...
Страница 37: ...37 KX FC265GR T b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format ...
Страница 61: ...61 KX FC265GR T Note Refer to Program Mode Table P 102 ...
Страница 69: ...69 KX FC265GR T 11 2 Cordless Handset ...
Страница 72: ...72 KX FC265GR T 11 3 2 Service Mode Settings Note The above values are the default values ...
Страница 80: ...80 KX FC265GR T Countermeasure ...
Страница 81: ...81 KX FC265GR T REFERENCE Test Mode P 62 ...
Страница 82: ...82 KX FC265GR T REFERENCE Test Mode P 62 ...
Страница 83: ...83 KX FC265GR T REFERENCE Test Mode P 62 ...
Страница 84: ...84 KX FC265GR T REFERENCE Test Mode P 62 ...
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Страница 86: ...86 KX FC265GR T REFERENCE Test Mode P 62 ...
Страница 87: ...87 KX FC265GR T REFERENCE Test Mode P 62 ...
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Страница 123: ...123 KX FC265GR T I O and Pin No Diagram ...
Страница 126: ...126 KX FC265GR T 12 5 5 2 NG Example ...
Страница 130: ...130 KX FC265GR T 12 5 7 2 Troubleshooting Flow Chart ...
Страница 136: ...136 KX FC265GR T 12 5 11 Thermal Head Section Note Refer to Thermal Head P 23 ...
Страница 145: ...145 KX FC265GR T 13 Service Fixture Tools ...
Страница 149: ...149 KX FC265GR T 14 2 5 Cordless Handset Section REFERENCE E 1 How to Remove the Cordless Handset Board P 173 ...
Страница 150: ...150 KX FC265GR T 14 3 Disassembly Procedure 14 3 1 How to Remove the Image Sensor CIS ...
Страница 151: ...151 KX FC265GR T 14 3 2 How to Remove the Thermal Head ...
Страница 152: ...152 KX FC265GR T ...
Страница 153: ...153 KX FC265GR T 14 3 3 How to Remove the Bottom Frame ...
Страница 154: ...154 KX FC265GR T 14 3 4 How to Remove the P C Boards and Speaker ...
Страница 155: ...155 KX FC265GR T 14 3 5 How to Remove the Power Supply Board and AC Cord ...
Страница 156: ...156 KX FC265GR T 14 3 6 How to Remove the Gear Block and Separation Roller ...
Страница 157: ...157 KX FC265GR T 14 3 7 How to Remove the Gears Motors and Arms of the Gear Block ...
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Страница 159: ...159 KX FC265GR T 14 3 8 How to Remove the Charger Board A ...
Страница 160: ...160 KX FC265GR T 14 3 9 How to Remove the Back Cover ...
Страница 161: ...161 KX FC265GR T 14 3 10 How to Remove the Platen Roller and Lock Lever ...
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Страница 163: ...163 KX FC265GR T 14 3 11 How to Remove the Pickup Roller and Antenna ...
Страница 164: ...164 KX FC265GR T 14 3 12 How to Remove the Operation Panel ...
Страница 165: ...165 KX FC265GR T 14 3 13 How to Remove the Operation Board MIC Board and LCD ...
Страница 166: ...166 KX FC265GR T 14 3 14 How to Remove the Separation Holder and Exit Roller ...
Страница 167: ...167 KX FC265GR T 14 3 15 Installation Position of the Lead Wires 14 3 15 1 Lower Section ...
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Страница 171: ...171 KX FC265GR T 14 3 15 2 Operation Panel Section ...
Страница 172: ...172 KX FC265GR T 14 3 15 3 Back Cover Section ...
Страница 173: ...173 KX FC265GR T 14 3 16 How to Remove the Cordless Handset Board ...
Страница 174: ...174 KX FC265GR T 14 3 16 1 How to Replace the LCD ...
Страница 196: ...196 KX FC265GR T 16 2 3 4 Copying Note See Sensor Locations in Sensor and Switches P 28 REFERENCE Sensor Section P 133 ...
Страница 203: ...203 KX FC265GR T 17 1 7 Cordless Handset Board ...
Страница 208: ...208 KX FC265GR T 17 4 Test Chart 17 4 1 ITU T No 1 Test Chart ...
Страница 209: ...209 KX FC265GR T 17 4 2 ITU T No 2 Test Chart ...
Страница 210: ...210 KX FC265GR T 17 4 3 Test Chart ...
Страница 211: ...211 KX FC265GR T Memo ...
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