10
KX-TG1032SK/KX-TGA101S
4.2.3.
Telephone Line Interface
<Function>
• Bell signal detection
• Clip signal detection
• ON/OFF hook circuit
Bell & Clip (: Calling Line Identification Presentation: Caller ID) signal detection:
In the standby mode, Q3 is open to cut the DC loop current and decrease the ring load.
When ring voltage appears at the L1T (A) and L1R (B) leads (when the telephone rings), the AC ring voltage is transferred as
follows;
• A
→
C4
→
R6
→
R33
→
IC7 Pin 60 (CID INp)
• B
→
C3
→
R4
→
R35
→
IC7 Pin 52 (CID INn)
ON/OFF hook circuit:
In the standby mode, Q3 is open, and connected as to cut the DC loop current and to cut the voice signal. The unit is conse-
quently in an
on-hook condition
.
When IC7 detects a ring signal or press the TALK Key onto the handset, Q4 turns on and then Q3 turns on, thus providing an
off-hook condition
(DC current flows through the circuit) and the following signal flow makes the loop current.
• A
→
D3
→
Q3
→
Q5
→
R21
→
R22
→
D3
→
B [
OFF
HOOK
]
4.2.4.
Transmitter/Receiver
• Audio Circuits and DTMF tone signal circuits.
Base Unit and Handset mainly consist of RF Module and DECT BBIC.
Base Unit and Handset transmit/receive voice signal and data signal through the antenna on carrier frequency.
Signal Path:
*Refer to
Signal Route
(P.14).
4.2.4.1.
Transmitter Block
The voice signal input from the TEL LINE interface goes to RF Module (IC10) through DECT BBIC (IC7) as shown in
Block Dia-
gram (Base Unit)
(P.7)
The voice signal passes through the analog part of IC7 where it is amplified and converted to a digital audio stream signal. The
burst switch controller processes this stream performing encryption and scrambling, adding the various other fields to produce
the GAP (
G
eneric
A
ccess
P
rofile) standard DECT frame, assigning to a time slot and channel etc.
In IC10, the carrier frequency is changing, and frequency modulated RF signal is generated and amplified, and radiated from
antenna. Handset detects the voice signal or data signal in the circuit same as the following explanation of Receiver Block.
4.2.4.2.
Receiver Block
The signal of 1900 MHz band (1881.792 MHz ~ 1897.344 MHz) which is input from antenna is input to IC10 as shown in
Block
Diagram (Base Unit)
(P.7).
In IC10, the signal of 1900 MHz band is downconverted to 864 kHz signal and demodulated, and goes to IC7 as GAP (
G
eneric
A
ccess
P
rofile) standard DECT frames. It passes through the decoding section burst switch controller where it separates out the
frame information and performs de-encryption and de-scrambling as required. It then goes to the DSP section where it is turned
back into analog audio. This is amplified by the analog front end, and goes to the TEL LINE Interface.
Summary of Contents for KX-TG1032SK
Page 2: ...2 KX TG1032SK KX TGA101S ...
Page 14: ...14 KX TG1032SK KX TGA101S 4 6 Signal Route ...
Page 15: ...15 KX TG1032SK KX TGA101S ...
Page 17: ...17 KX TG1032SK KX TGA101S 8 Service Mode 8 1 Engineering Mode 8 1 1 Base Unit ...
Page 19: ...19 KX TG1032SK KX TGA101S 8 1 2 Handset ...
Page 33: ...33 KX TG1032SK KX TGA101S 9 1 4 5 RF BBIC Interface Signal Wave Form SYCL SYEN SYDA ...
Page 39: ...39 KX TG1032SK KX TGA101S ...
Page 40: ...40 KX TG1032SK KX TGA101S 10 1 2 Handset ...
Page 41: ...41 KX TG1032SK KX TGA101S 10 1 3 Charger Unit ...
Page 42: ...42 KX TG1032SK KX TGA101S ...
Page 43: ...43 KX TG1032SK KX TGA101S 10 2 How to Replace the Handset LCD ...
Page 44: ...44 KX TG1032SK KX TGA101S 10 3 How and Where to fix the spacer ...
Page 45: ...45 KX TG1032SK KX TGA101S ...
Page 65: ...65 KX TG1032SK KX TGA101S Memo ...
Page 72: ...72 KX TG1032SK KX TGA101S Memo ...
Page 78: ...78 KX TG1032SK KX TGA101S 15 3 Cabinet and Electric Parts Charger Unit ...