5-6
Samsung Electronics
Figure 5-10 Remote Receive
5-8-6 Remote Receive
This circuit switches the machine to automatic
receive mode when it detects *2* key input from
the phone extension.
Circuit Description
TIP
RING
EXT
LINE
Remote RCV
Figure 5-9 MF/DP Dialing
5-8-5 MF/DP Dialing
DP dialing is activated by receiving digital data
from CPU through UART Tx. The signal turns on
and off Q2 through ILIU chip and DPN. It causes
Q1 to be on and off to generate the dial pulse.
MF dialing is activated by receiving digital data
from CPU through UART Tx. ILIU chip adjusts
DTMF frequency and level through RFO and RFI
and sends out the DTMF signal.
RFO
4
9
C14
C15
R21
R20
Q3
Q2
Q1
27
35
37
39
CS
LI
LS
RFO
RFI
DDN