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• CODEC Control...IC6, IC7

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 310V is mounted between SFG and FG. Furthermore, Zenner Diode
(D5) with the discharge voltage 25V 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, 2 lines out of 8 lines can be connected to the
SLT port, which provides a switching relay for power failure on the extension card, by a cable. Connecting CN3 with the connec-
tor for power failure on the extension card can call at the power failure.

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As option cards, 8-Port Analog Trunk Card with CID extention card(CLCOT8E) can be mounted.

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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~H that are mounted between T-R.