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This is detected by the photo coupler (pin 4 of PC4) at part of making DC loop. PC4 4-pin is High level during a call. However, at
end-call, PC4 4-pin converts from High to Low.
It detects an end-call with measuring of the signal width of Low level by CODEC (e.g. pin 35 of IC203, CPCDET).
The available setting values for detection width are none, 0.5msec-8msec(at 2msec intervals) and 16~896msec(at 8msec inter-
vals).

Configured by the photo couplers (PC1, PC2) that enable to detect each current in Tip

→Ring, Ring→Tip direction. (PC2 is used

in common as the bell detection photo coupler). Using Software, it stores the current direction (the detected photo coupler) at
acquiring line and recognizes the action by changing of the current direction (the detected photo coupler changes).

When the current flows in the direction of Ring to Tip, 4-pin of PC1 is Low and 4-pin of PC2 is High.

• Ring

→L1→R2→PC1(1-2)→D3→RL3→Q6(C-E)→D4→D3→RL1→J2→L1→J1→Tip

When the current direction (polarity) is reversed from Tip to Ring, 4-pin of PC1 turns to High and 4-pin of PC2 turns to Low. It
recognizes the action by changing of the current direction (the detected photo coupler changes).

• Tip

→J1→L1→D3→RL3→Q6 (C-E)→D4→D3→PC2 (1-2)→R2→L1→Ring

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This converts 4W-voice signal inside PBX and 2W-voice signal on SLT line. It is configured by Op-Amp in HIC and BN (Balance
Network) in CODEC. It determines the return loss of voice and the frequency characteristic, and it can match with all sorts of
impedance by changing the programs of CODEC.

A dedicated interface, which can connect PEB2466 by Infineon up to 2, for enabling circuit controls.

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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.