12.10. Telephone Line Interface
Circuit Operation:
ANSWER / In the idle mode, Q121 is open to cut the DC loop current and decrease the ring load.
When ring voltage appears at the Tip (T) and Ring (R) leads (When the telephone rings), the AC
ring voltage is transferred as follows: / T
L101
R103
C103
Q101
IC501 pin 64. /
When the CPU (DSP) detects a ring signal, Q121 turns on, thus providing an off-hook condition
(active DC current flow through the circuit) and the following signal flow is for the voice signal. /
T
D101
Q121
Q131
R138
C140
D101
L102
PO101
R
ON HOOK / Q121 is open, Q121 is connected as to cut the DC loop current and to cut the voice
signal. The unit is consequently in an on-hook condition.
SPECIFICATIONS / In the on-hook state (idle), the current flows between the telephone line and
the unit is as follows: / T
L101
R103
C103
R106
C104
R104
L102
PO101
R. / The DC component is blocked by C103, C104: thereby providing an on-hook
condition. / The AC interface impedance is over 47 k ; thus, satisfying the telephone company
requirements.
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Содержание KX-TG2650N
Страница 2: ...1 LOCATION OF CONTROLS 1 1 Base Unit 2 ...
Страница 3: ...1 2 Handset 3 ...
Страница 5: ...3 SETTINGS 3 1 Connections 5 ...
Страница 7: ...3 2 Battery Charge 3 2 1 Battery Strength 3 2 2 Recharge 3 2 3 Battery Information 7 ...
Страница 8: ...3 3 Selecting the Dialing Mode 8 ...
Страница 9: ...3 4 Selecting the Line Mode 9 ...
Страница 10: ...4 OPERATION 4 1 Making Calls 4 1 1 With the Handset 10 ...
Страница 11: ...11 ...
Страница 12: ...12 ...
Страница 13: ...4 1 2 With the Base Unit Digital Duplex Speakerphone 13 ...
Страница 14: ...14 ...
Страница 15: ...4 2 Answering Calls 15 ...
Страница 16: ...16 ...
Страница 19: ...4 4 3 Viewing the Caller List 19 ...
Страница 20: ...20 ...
Страница 21: ...4 4 4 Calling Back from the Caller List 4 4 5 Editing the Caller s Phone Number 4 4 5 1 With the handset 21 ...
Страница 22: ...4 4 5 2 With the base unit 22 ...
Страница 23: ...4 4 6 Storing Caller List Information in the Directory 23 ...
Страница 24: ...4 4 7 Erasing Caller List Information 24 ...
Страница 25: ...5 DISASSEMBLY INSTRUCTIONS 25 ...
Страница 26: ...26 ...
Страница 28: ...6 2 Assembly the LCD to P C Board Handset 28 ...
Страница 31: ...7 1 Check Power 31 ...
Страница 32: ...7 2 Error Indication 7 3 Check SP Phone Voice Transmission 32 ...
Страница 33: ...7 4 Check SP Phone Voice Reception 7 5 Check Battery Charge 33 ...
Страница 34: ...7 6 Check Link 34 ...
Страница 38: ...7 7 4 Check Table for RF Block 38 ...
Страница 42: ...7 8 Check Handset Voice Transmission 42 ...
Страница 43: ...7 9 Check Handset Voice Reception 43 ...
Страница 44: ...7 10 Check Call ID 44 ...
Страница 45: ...8 TEST MODE AND ADJUSTMENT 8 1 Test Mode Flow Chart for Base Unit 45 ...
Страница 51: ...9 5 Explanation of DSP Data Communication 9 5 1 Calling 51 ...
Страница 66: ...15 1 IC501 16 CPU DATA Handset 16 1 IC201 66 ...
Страница 67: ...17 EXPLANATION OF IC TERMINALS RF Unit Base Unit 17 1 IC101 67 ...
Страница 68: ...68 ...
Страница 69: ...18 HOW TO REPLACE FLAT PACKAGE IC 18 1 Preparation SOLDER 69 ...
Страница 72: ...72 ...
Страница 73: ...20 CABINET AND ELECTRICAL PARTS Handset 21 ACCESSORIES AND PACKING MATERIALS 73 ...
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