16
KX-TG6071BXM/KX-TGA601BXM
4.5.5.
Telephone Line Interface
Telephone Line Interface Circuit:
Function
• Bell signal detection
• ON/OFF hook and pulse dial circuit
• Side tone circuit
Bell signal detection and OFF HOOK circuit:
In the idle mode, Q141 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
→
R111
→
C111
→
Q111
→
DSP pin 58 [BELL]
When the CPU (DSP) detects a ring signal, Q141 turns on, thus providing an off-hook condition (active DC current flow through
the circuit). Following signal flow is the DC current flow.
T
→
L101
→
D101
→
Q141
→
Q161
→
R163
→
D101
→
L102
→
P101
→
R
ON HOOK Circuit:
Q141 is open, Q141 is connected as to cut the DC loop current and to cut the voice signal. The unit is consequently in an on-
hook condition.
Pulse Dial Circuit:
Pin 59 of DSP turns Q141 ON/OFF to make the pulse dialing.
Side Tone Circuit:
Basically this circuit prevents the TX signal from feeding back to RX signal. As for this unit, TX signal feed back from Q161 is
canceled by the canceller circuit of DSP.
Summary of Contents for KX-TG6071BXM
Page 2: ...2 KX TG6071BXM KX TGA601BXM ...
Page 29: ...29 KX TG6071BXM KX TGA601BXM 4 10 Signal Route ...
Page 30: ...30 KX TG6071BXM KX TGA601BXM RF part signal route ...
Page 35: ...35 KX TG6071BXM KX TGA601BXM 7 1 2 Programming using the Direct Commands ...
Page 37: ...37 KX TG6071BXM KX TGA601BXM 7 3 Error Messages ...
Page 38: ...38 KX TG6071BXM KX TGA601BXM 7 4 Troubleshooting ...
Page 39: ...39 KX TG6071BXM KX TGA601BXM ...
Page 40: ...40 KX TG6071BXM KX TGA601BXM ...
Page 62: ...62 KX TG6071BXM KX TGA601BXM 10 1 8 5 RF DSP Interface Signal Wave Form Test Burst Mode ...
Page 63: ...63 KX TG6071BXM KX TGA601BXM Test Burst Mode ...
Page 71: ...71 KX TG6071BXM KX TGA601BXM ...
Page 72: ...72 KX TG6071BXM KX TGA601BXM 11 1 2 Handset ...
Page 73: ...73 KX TG6071BXM KX TGA601BXM 11 2 How to Replace the Handset LCD ...
Page 74: ...74 KX TG6071BXM KX TGA601BXM ...
Page 81: ...81 KX TG6071BXM KX TGA601BXM Memo ...
Page 87: ...87 KX TG6071BXM KX TGA601BXM Memo ...
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Page 100: ...100 KX TG6071BXM KX TGA601BXM Memo ...
Page 106: ...106 KX TG6071BXM KX TGA601BXM 15 3 Explanation of IC Terminals RF Part 15 3 1 IC701 ...
Page 107: ...107 KX TG6071BXM KX TGA601BXM 15 3 2 IC801 ...
Page 111: ...111 KX TG6071BXM KX TGA601BXM 16 3 Accessories and Packing Materials ...