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8.6. MODEM SECTION
8.6.1. 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
converted 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 CCITT (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.
Determined 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
density 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.
153
KX-FC971CX-S / KX-FGA521CX-S
Содержание KX-FC971CX-S
Страница 29: ...6 2 BASE UNIT 6 2 1 HOW TO REMOVE THE PAPER STACKER 29 KX FC971CX S KX FGA521CX S ...
Страница 30: ...6 2 2 HOW TO REMOVE THE OPERATION PANEL BLOCK 30 KX FC971CX S KX FGA521CX S ...
Страница 31: ...6 2 3 HOW TO REMOVE THE OPERATION BOARD LCD MICROPHONE UNIT and PLATEN ROLLER 31 KX FC971CX S KX FGA521CX S ...
Страница 32: ...6 2 4 HOW TO REMOVE THE SEPARATION HOLDER AND DOCUMENT FEED SUPPORT 32 KX FC971CX S KX FGA521CX S ...
Страница 33: ...6 2 5 HOW TO REMOVE THE IMAGE SENSOR CIS AND FEED ROLLER 33 KX FC971CX S KX FGA521CX S ...
Страница 34: ...6 2 6 HOW TO REMOVE THE ANTENNA AND CUTTER UNIT 34 KX FC971CX S KX FGA521CX S ...
Страница 35: ...6 2 7 HOW TO REMOVE THE LOCK LEVER AND THERMAL HEAD 35 KX FC971CX S KX FGA521CX S ...
Страница 36: ...6 2 8 HOW TO REMOVE THE BOTTOM FRAME 36 KX FC971CX S KX FGA521CX S ...
Страница 39: ...6 2 12 INSTALLATION POSITION OF THE LEAD WIRES 39 KX FC971CX S KX FGA521CX S ...
Страница 40: ...6 3 CORDLESS HANDSET 6 3 1 HOW TO REMOVE THE BATTERY COVER AND CABINET COVER 40 KX FC971CX S KX FGA521CX S ...
Страница 41: ...41 KX FC971CX S KX FGA521CX S ...
Страница 42: ...42 KX FC971CX S KX FGA521CX S ...
Страница 43: ...6 3 2 HOW TO REMOVE THE CORDLESS HANDSET BOARD 43 KX FC971CX S KX FGA521CX S ...
Страница 68: ...7 7 4 8 WHEN COPYING OR PRINTING AN ABNORMAL SOUND IS HEARD FROM THE UNIT 68 KX FC971CX S KX FGA521CX S ...
Страница 69: ...CROSS REFERENCE DISASSEMBLY INSTRUCTIONS P 27 69 KX FC971CX S KX FGA521CX S ...
Страница 80: ...80 KX FC971CX S KX FGA521CX S ...
Страница 81: ...CROSS REFERENCE TEST FUNCTIONS P 50 81 KX FC971CX S KX FGA521CX S ...
Страница 82: ...CROSS REFERENCE TEST FUNCTIONS P 50 82 KX FC971CX S KX FGA521CX S ...
Страница 83: ...CROSS REFERENCE TEST FUNCTIONS P 50 83 KX FC971CX S KX FGA521CX S ...
Страница 84: ...CROSS REFERENCE TEST FUNCTIONS P 50 84 KX FC971CX S KX FGA521CX S ...
Страница 85: ...85 KX FC971CX S KX FGA521CX S ...
Страница 86: ...86 KX FC971CX S KX FGA521CX S ...
Страница 87: ...CROSS REFERENCE TEST FUNCTIONS P 50 87 KX FC971CX S KX FGA521CX S ...
Страница 91: ...91 KX FC971CX S KX FGA521CX S ...
Страница 95: ...7 7 6 2 CHECK THE STATUS OF THE DIGITAL BOARD I O and Pin No Diagram 95 KX FC971CX S KX FGA521CX S ...
Страница 97: ...Other NG example while the power is ON and the LCD displays the following 97 KX FC971CX S KX FGA521CX S ...
Страница 98: ...7 7 6 3 NG Example 98 KX FC971CX S KX FGA521CX S ...
Страница 102: ...7 7 8 2 Troubleshooting Flow Chart 102 KX FC971CX S KX FGA521CX S ...
Страница 107: ...7 7 12 THERMAL HEAD SECTION Refer to THERMAL HEAD P 138 107 KX FC971CX S KX FGA521CX S ...
Страница 109: ...7 7 13 3 Check Link 7 7 13 3 1 Base Unit Analog Board 7 7 13 3 2 Cordless Handset 109 KX FC971CX S KX FGA521CX S ...
Страница 126: ...8 CIRCUIT OPERATIONS 8 1 CONNECTION DIAGRAM 126 KX FC971CX S KX FGA521CX S ...
Страница 128: ...Supplies 5V 8V and 24V to the unit 128 KX FC971CX S KX FGA521CX S ...
Страница 137: ...8 4 2 BLOCK DIAGRAM 137 KX FC971CX S KX FGA521CX S ...
Страница 139: ...139 KX FC971CX S KX FGA521CX S ...
Страница 146: ...8 4 6 3 2 SCANNING CROSS REFERENCE SENSOR SECTION P 105 146 KX FC971CX S KX FGA521CX S ...
Страница 147: ...8 4 6 3 3 PRINTING Note See SENSORS AND SWITCHES P 149 147 KX FC971CX S KX FGA521CX S ...
Страница 148: ...8 4 6 3 4 COPYING CROSS REFERENCE SENSOR SECTION P 105 148 KX FC971CX S KX FGA521CX S ...
Страница 158: ...b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format 158 KX FC971CX S KX FGA521CX S ...
Страница 162: ...162 KX FC971CX S KX FGA521CX S ...
Страница 178: ...9 1 1 3 Operation Board 9 1 1 4 Power Supply Board 9 1 2 Cordless Handset 178 KX FC971CX S KX FGA521CX S ...
Страница 181: ...9 3 TEST CHART 9 3 1 ITU T No 1 TEST CHART 181 KX FC971CX S KX FGA521CX S ...
Страница 182: ...9 3 2 ITU T No 2 TEST CHART 182 KX FC971CX S KX FGA521CX S ...
Страница 183: ...10 FIXTURES AND TOOLS 183 KX FC971CX S KX FGA521CX S ...
Страница 184: ...11 CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION 11 1 OPERATION PANEL SECTION 184 KX FC971CX S KX FGA521CX S ...
Страница 185: ...11 2 UPPER CABINET SECTION 185 KX FC971CX S KX FGA521CX S ...
Страница 186: ...11 3 LOWER CABINET SECTION 186 KX FC971CX S KX FGA521CX S ...
Страница 187: ...11 4 MOTOR SECTION 187 KX FC971CX S KX FGA521CX S ...
Страница 188: ...11 5 CORDLESS HANDSET SECTION 188 KX FC971CX S KX FGA521CX S ...
Страница 189: ...11 6 CHARGER UNIT SECTION 189 KX FC971CX S KX FGA521CX S ...
Страница 190: ...11 7 ACTUAL SIZE OF SCREWS 190 KX FC971CX S KX FGA521CX S ...
Страница 191: ...12 ACCESSORIES AND PACKING MATERIALS 191 KX FC971CX S KX FGA521CX S ...
Страница 192: ...13 ACCESSORIES AND PACKING MATERIALS 13 1 KX FGA521CX 192 KX FC971CX S KX FGA521CX S ...
Страница 217: ...17 4 POWER SUPPLY BOARD IC101 KX FC971CX S POWER SUPPLY BOARD KX FC971CX S KX FGA521CX S 217 ...