Panasonic KX-TDA6181X, Service Manual, Page: 21 / 71

7.2.7. 2W-4W Conversion
This converts 4W-voice signal inside PBX and 2W-voice signal on SLT or Trunk. It is configured by Op-Amp and BN (Balance
Network) in CODEC. It affects the return loss of the voice and the frequency characteristic, and is determined by setting the best
value of Infineon CODEC and a software register.
7.2.8. Interface
•
• •
•
CODEC Control...IC6, IC7, IC9, IC10
This uses PEB2466 by Infineon. CODEC interface DCLK, CS, DOUT and DIN configure the analog characteristic such as BN,
frequency characteristic, level, lateral constant. Also, the built-in I/O port is used as CPC detection, DIAL control, BELL
detection, Reverse detection, DIAL Shunt control and DIAG relay control.
• • • • A/D, D/A Conversion
This converts 4Wire analog signal and G.711 PCM (µ/A).
7.2.9. Surge Protection
A gas arrester (SA1) with the discharge voltage 230V is mounted between T and SFG, R and SFG. And a discharge tube (SA3)
with the discharge voltage 1KV is mounted between SFG and FG. Furthermore, ZNR (ZNR1) with the discharge voltage 82V is
mounted on the PBX side of the photo MOS relay for each line.
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KX-TDA6181X