10
KX-TG6461BXT/KX-TGA641BXT
4.2.3. Telephone Line Interface
Function
• Bell signal detection
• CLIP signal detection
• ON/OFF hook and pulse dial circuit
Bell & CLIP (Calling Line Identification Presentation: Caller ID) signal detection:
In standby mode,Q111/Q115 is open to cut the DC Loop current and decrease the ring load.
When ringing voltage appears at the TIP and RING, AC ring voltages transferred as followings;
CLIP signal detection
TIP → C181 → R182 → R185 → IC501(26)(BBIC-CIDINn)
RING → C191 → R192 → R195 → IC501(27)(BBIC-CIDINp)
Bell signal detection
TIP → C181 → R182 → C184 → R186 → C187 → IC501(30)(BBIC-RINGING)
When power line failure (Because this case is no power to IC501)
TIP → C164 → D161(2) → D161(1) → IC101(1:5) → R167 → RINGERP
RING ← D161(3) ← D161(4) ← Q162(c:e) ← IC101(2:8) ← RINGERM
ON/OFF hook circuit
ON hook:
Q111/Q115 is open to cut the DC loop current and voice signal, caused by the following control:
Hook switch (between hook2-4 and hook2-6) is opened and IC501(29)(Hook CTRL) is Low, (and Q114 is open), then Q112 is
OFF,so Q111/115 is OPEN
OFF hook:
Q111/Q115 is ON to make the DC loop current and be possible to transfer voice signal, caused by the following control:
Hook switch (between hook2-4 and hook2-6) make and IC501(29)(Hook CTRL) is High. (and Q114 is open), then Q112 is ON.
4.2.4. Audio signal Flow (Out line)
The audio signal from Mic (for SP-phone and Corded Handset) is converted from Analog to digital in TAM companion IC(IC201),
then is transfered to BBIC(IC501) through PCM interface.
In BBIC(IC501), these data is converted to Analog, then send out tel line through tel line interface.
On the other hand, the audio signal from tel line is converted from Analog to digital in BBIC(IC501), then is transfered to TAM
companion IC(IC201) through PCM interface.
In TAM companion IC(IC201) ,these data is converted to Analog, then sound out from speaker.
On the recorded and replay TAM data, as following.
On recording sound, the audio signal from the tel line is converted to digital data in BBIC, then is transfered to TAM companion
IC through SPI2 interface and compressed. This compressed data re-transfer to BBIC, then BBIC transfer these data to Flash-
memory(IC541) through SPI interface. On replaying the recorded TAM data, the compressed data in Flash-memory is transferd
to BBIC through SPI interface. Then BBIC transfer these data to TAM companion IC through SPI2 interface to decompress
these data.TAM companion IC send back the decompress data to BBIC. BBIC transfer them to TAM companion IC through PCM
interface, finally these data is coverted to Analog signal, then sound out Speaker.
Refer to the fig.2.
<Fig.2>
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