52
KX-FG2452CX
6.14. Cordless Section
6.14.1. Frequency
The frequency range of 2400MHz~2480MHz is used. Transmitting and receiving channel between base unit and handset is same
frequency. Refer to the
6.14.2. FHSS (Frequency Hopping Spread Spectrum)
This telephone is using an IC chip which has similar specification to WDCT (World Digital Cordless Telephone) and is the cord-
less telephone system that can use multiple portable unit simultaneously.
The explanation of this system is mentioned below.
This system uses a Time Division Multiple Access/Time Division Duplex (
TDMA
/
TDD
) scheme:
Transmitting and receiving frequencies of the base unit and cordless handset are shared in the same
frequency. The construction of RX/TX frequency data is shown below. It consists
of 4 slots from the base unit to the cordless handset, and 4 slots from the cordless handset to the
base unit, total 8 slots in 10ms. By this slot system, simultaneous air link and communication between 4 cordless handsets and
the base unit can be realized. One communication between cordless handset and the base unit
is done by one slot from the base unit to cordless handset, and another slot from cordless handset to
the base unit.
DSS makes spectrum spread by multiplying carrier signal by PN code.
The purpose to make spectrum spread is to reduce power density per time and per band.
On the other hand,
FHSS
makes spectrum spread by changing channel every 10ms according to
Hopping table. Also the purpose to make spectrum spread is to reduce power density per time and
per band.
Содержание KX-FG2452CX
Страница 10: ...10 KX FG2452CX 6 Technical Descriptions 6 1 Connection Diagram ...
Страница 14: ...14 KX FG2452CX 6 3 2 Memory Map ...
Страница 23: ...23 KX FG2452CX 6 4 2 Block Diagram ...
Страница 25: ...25 KX FG2452CX ...
Страница 38: ...38 KX FG2452CX b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format ...
Страница 61: ...61 KX FG2452CX 6 14 5 7 Power Supply Circuit Voltage is supplied separately to each block ...
Страница 76: ...76 KX FG2452CX 9 2 3 Other Features ...
Страница 81: ...81 KX FG2452CX 10 2 1 1 Test Burst Mode and Test TX CW Mode ...
Страница 82: ...82 KX FG2452CX 10 2 1 2 RX CW Test Mode ...
Страница 83: ...83 KX FG2452CX 10 2 1 3 Test Link Mode ...
Страница 93: ...93 KX FG2452CX 11 3 2 Service Mode Settings Note The above values are the default values ...
Страница 101: ...101 KX FG2452CX Countermeasure ...
Страница 102: ...102 KX FG2452CX REFERENCE Test Mode P 77 ...
Страница 103: ...103 KX FG2452CX REFERENCE Test Mode P 77 ...
Страница 104: ...104 KX FG2452CX REFERENCE Test Mode P 77 ...
Страница 105: ...105 KX FG2452CX REFERENCE Test Mode P 77 ...
Страница 106: ...106 KX FG2452CX ...
Страница 107: ...107 KX FG2452CX REFERENCE Test Mode P 77 ...
Страница 108: ...108 KX FG2452CX REFERENCE Test Mode P 77 ...
Страница 112: ...112 KX FG2452CX ...
Страница 137: ...137 KX FG2452CX ...
Страница 144: ...144 KX FG2452CX I O and Pin No Diagram ...
Страница 146: ...146 KX FG2452CX Other NG example while the power is ON and the LCD displays the following ...
Страница 147: ...147 KX FG2452CX 12 5 5 2 NG Example ...
Страница 149: ...149 KX FG2452CX ...
Страница 152: ...152 KX FG2452CX Note Check to the SP Phone Rx Tx signal routes Refer to Check Sheet for Signal Route P 148 ...
Страница 154: ...154 KX FG2452CX 12 5 8 2 Troubleshooting Flow Chart ...
Страница 159: ...159 KX FG2452CX 12 5 11 CIS Contact Image Sensor Section Note 1 Test Mode P 77 Refer to Scanning Block P 26 ...
Страница 160: ...160 KX FG2452CX 12 5 12 Thermal Head Section Note Refer to Thermal Head P 24 ...
Страница 167: ...167 KX FG2452CX 12 5 15 1 5 RF DSP Interface Signal Wave Form ...
Страница 169: ...169 KX FG2452CX 13 Service Fixture Tools ...
Страница 173: ...173 KX FG2452CX 14 2 5 Handset Section REFERENCE E 1 How to Remove the Handset Board P 197 ...
Страница 174: ...174 KX FG2452CX 14 3 Disassembly Procedure 14 3 1 How to Remove the Image Sensor CIS ...
Страница 175: ...175 KX FG2452CX 14 3 2 How to Remove the Thermal Head ...
Страница 176: ...176 KX FG2452CX ...
Страница 177: ...177 KX FG2452CX 14 3 3 How to Remove the Bottom Frame ...
Страница 178: ...178 KX FG2452CX 14 3 4 How to Remove the P C Boards and Speaker ...
Страница 179: ...179 KX FG2452CX 14 3 5 How to Remove the Power Supply Board and AC Cord ...
Страница 180: ...180 KX FG2452CX 14 3 6 How to Remove the Gear Block and Separation Roller ...
Страница 181: ...181 KX FG2452CX 14 3 7 How to Remove the Gears Motors and Arms of the Gear Block ...
Страница 182: ...182 KX FG2452CX ...
Страница 183: ...183 KX FG2452CX 14 3 8 How to Remove the Charger Case ...
Страница 184: ...184 KX FG2452CX 14 3 9 How to Remove the Back Cover ...
Страница 185: ...185 KX FG2452CX 14 3 10 How to Remove the Platen Roller and Lock Lever ...
Страница 186: ...186 KX FG2452CX ...
Страница 187: ...187 KX FG2452CX 14 3 11 How to Remove the Pickup Roller and Antenna ...
Страница 188: ...188 KX FG2452CX 14 3 12 How to Remove the Operation Panel ...
Страница 189: ...189 KX FG2452CX 14 3 13 How to Remove the Operation Board MIC Board and LCD ...
Страница 190: ...190 KX FG2452CX 14 3 14 How to Remove the Separation Holder and Exit Roller ...
Страница 191: ...191 KX FG2452CX 14 3 15 Installation Position of the Lead Wires 14 3 15 1 Lower Section ...
Страница 192: ...192 KX FG2452CX ...
Страница 193: ...193 KX FG2452CX ...
Страница 194: ...194 KX FG2452CX ...
Страница 195: ...195 KX FG2452CX 14 3 15 2 Operation Panel Section ...
Страница 196: ...196 KX FG2452CX 14 3 15 3 Back Cover Section ...
Страница 197: ...197 KX FG2452CX 14 3 16 How to Remove the Handset Board ...
Страница 198: ...198 KX FG2452CX 14 3 16 1 How to Replace the Handset LCD ...
Страница 213: ...213 KX FG2452CX 16 2 3 4 Copying Note See Sensor Locations in Sensors and Switches P 29 REFERENCE Sensor Section P 157 ...
Страница 219: ...219 KX FG2452CX 17 1 3 Operation Board Microphone Board 17 1 4 Power Supply Board 17 1 5 Interface Board ...
Страница 220: ...220 KX FG2452CX 17 1 6 Handset Board ...
Страница 223: ...223 KX FG2452CX 17 3 Test Chart 17 3 1 ITU T No 1 Test Chart ...
Страница 224: ...224 KX FG2452CX 17 3 2 ITU T No 2 Test Chart ...
Страница 225: ...225 KX FG2452CX 17 3 3 Test Chart ...
Страница 251: ...251 KX FG2452CX 20 3 Explanation of RF unit Terminals RF Unit 20 3 1 IC901 ...
Страница 253: ...253 KX FG2452CX 21 1 2 Operation Panel Section ...
Страница 254: ...254 KX FG2452CX 21 1 3 Upper Cabinet Section ...
Страница 255: ...255 KX FG2452CX 21 1 4 Back Cover Section ...
Страница 256: ...256 KX FG2452CX ...
Страница 257: ...257 KX FG2452CX 21 1 5 Lower Cabinet Section ...
Страница 258: ...258 KX FG2452CX 21 1 6 Gear Block Section ...
Страница 259: ...259 KX FG2452CX ...
Страница 261: ...261 KX FG2452CX 21 1 8 Screws ...
Страница 262: ...262 KX FG2452CX 21 1 9 Accessories and Packing Materials ...