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characteristic, volume level, sidetone are configured by ASIC CODEC interface DCLK, CS,
DOUT, DIN. In addition, the CODEC has an internal I/O port that supports Hook detection, DTMF
detection, BELL relay control and DIAG relay control. Also, it converts A/D to D/A, and 4-line-
analogue signal to PCM code (É/A) in G.711 format.
8.4. 2W-4W CONVERSION
It converts 4W-VOX signal used in the PBX to 2W-VOX signal used in SLT, and vise versa. It
consists of an operational amplifier in the HIC and a balanced network in the CODEC. It can
control the return loss of the audio data and frequency characteristics. By modifying the
CODEC program, it can match the corresponding impedance.
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