
19
KX-TG5771BXS/KX-TGA570BXS
4.5.7.
Parallel Connection Detect Circuit
Function:
In order to disable call waiting and stutter tone functions when using telephones connected in parallel, it is necessary to have a
circuit that judges whether a telephone connected in parallel is in use or not. This circuit determines whether the telephone
connected in parallel is on hook or off hook by detecting changes in the T/R voltage.
Circuit Operation:
Parallel connection detection when on hook:
When on hook, the voltage is monitored at pin 86 of IC501. There is no parallel connection if the voltage is
1.65 V or higher, while a parallel connection is deemed to exist if the voltage is lower.
Parallel connection detection when off hook:
When off hook, the voltage is monitored at pin 90 of IC501; the presence/absence of a parallel connection is determined when
the voltage changes by 0.2 V or more.
Содержание KX-TG5771BXS
Страница 2: ...2 KX TG5771BXS KX TGA570BXS ...
Страница 6: ...6 KX TG5771BXS KX TGA570BXS 3 Specifications ...
Страница 24: ...24 KX TG5771BXS KX TGA570BXS 4 8 2 Power Supply Circuit Voltage is supplied separately to each block ...
Страница 33: ...33 KX TG5771BXS KX TGA570BXS 4 11 Signal Route Each signal route is as follows ...
Страница 34: ...34 KX TG5771BXS KX TGA570BXS Each signal route is as follows RF part signal route ...
Страница 35: ...35 KX TG5771BXS KX TGA570BXS 5 Location of Controls and Components 5 1 Controls 5 1 1 Base Unit ...
Страница 37: ...37 KX TG5771BXS KX TGA570BXS 5 2 3 Handset Menu Icons ...
Страница 40: ...40 KX TG5771BXS KX TGA570BXS 6 5 Expanding Your Phone System ...
Страница 41: ...41 KX TG5771BXS KX TGA570BXS 7 Operation Instructions 7 1 Symbols Used in These Operating Instructions ...
Страница 43: ...43 KX TG5771BXS KX TGA570BXS ...
Страница 44: ...44 KX TG5771BXS KX TGA570BXS 7 2 2 Programming Using the Direct Commands ...
Страница 46: ...46 KX TG5771BXS KX TGA570BXS 7 4 Error Messages ...
Страница 47: ...47 KX TG5771BXS KX TGA570BXS 7 5 Troubleshooting ...
Страница 48: ...48 KX TG5771BXS KX TGA570BXS ...
Страница 49: ...49 KX TG5771BXS KX TGA570BXS ...
Страница 69: ...69 KX TG5771BXS KX TGA570BXS 10 2 9 1 RF DSP Interface Signal Wave Form Test Burst Mode ...
Страница 70: ...70 KX TG5771BXS KX TGA570BXS Test Burst Mode ...
Страница 77: ...77 KX TG5771BXS KX TGA570BXS 11 1 2 Handset ...
Страница 78: ...78 KX TG5771BXS KX TGA570BXS 11 1 3 Charger Unit ...
Страница 79: ...79 KX TG5771BXS KX TGA570BXS 11 2 Fix the LCD and the Receiver Guide to the Main P C Board Handset ...
Страница 91: ...91 KX TG5771BXS KX TGA570BXS Memo ...
Страница 100: ...100 KX TG5771BXS KX TGA570BXS Memo ...
Страница 109: ...109 KX TG5771BXS KX TGA570BXS 15 3 Explanation of IC Terminals RF Part 15 3 1 IC701 ...
Страница 110: ...110 KX TG5771BXS KX TGA570BXS 15 3 2 IC801 Backside Terminal GND ...
Страница 111: ...111 KX TG5771BXS KX TGA570BXS 15 3 3 IC851 Backside Terminal GND ...
Страница 112: ...112 KX TG5771BXS KX TGA570BXS 15 4 Terminal Guide of the ICs Transistors and Diodes 15 4 1 Base Unit 15 4 2 Handset ...
Страница 113: ...113 KX TG5771BXS KX TGA570BXS 16 Exploded View and Replacement Parts List 16 1 Cabinet and Electrical Parts Base Unit ...
Страница 115: ...115 KX TG5771BXS KX TGA570BXS 16 3 Cabinet and Electrical Parts Charger Unit ...
Страница 116: ...116 KX TG5771BXS KX TGA570BXS 16 4 Accessories and Packing Materials 16 4 1 KX TG5771BXS ...
Страница 117: ...117 KX TG5771BXS KX TGA570BXS 16 4 2 KX TGA570BXS ...