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• CODEC Control...IC201, IC202

This uses PEB2466 by Infineon. CODEC interface DCLK, CS, DOUT and DIN configure the analog characteristic such as BN,
frequency characteristic, level, lateral consonant. Also, the built-in I/O port is used as HOOK detection, DTMF detection, BELL
relay control and DIAG relay control.

• A/D, D/A Conversion

This converts 4 wire analog signal and G.711 format PCM (

µ/A).

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 adding line.

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At the time of the power failure, for enabling a direct call to the extension phone, 1 lines out of 4 lines can be connected to the
SLT port, which provides a switching relay for power failure on the extension card, by a cable. Connecting CN2 with the connec-
tor for power failure on the extension card can call at the power failure.

It rejects the extrinsic noise that comes from the outside line with the coils L1A-H that are mounted common between T- R and
the condensers C1A-D that are mounted between T-R.

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The input from the main power supply is in 1 voltage levels: +15V. 
Since the voltage levels: +15V,+5V,+3.3V are required onboard, voltage levels are generated onboard as written below.

The protection circuit consists of an output short protection and an overvoltage protection. 
When an output of power supply is short, IC800 or IC801 works to stop the output as the output short protection.
When +5V and/or +3V output become overvoltage caused by Q802 and/or Q803 short, it is detected by D806 and D807.

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