Samsung SF-530 Service Manual page 100

CIRCUIT DESCRIPTION
Modem Functions Interface Signals
V.24
Interface
Host
Processor
* Selectable; TXRQ output replaces /RI output.
** Selectable; RXRQ output replaces /DSR output.
Repair Manual
3-10
/RTS
/CTS
TXD
TDCLK
XTCLK
/RLSD
RXD
/RDCLK
/DTR
/DSR**
/RI*
F M 3 3 6
/RD
M o d e m
/WR
/CS
D[7:0]
RS[4:0]
IRQ
/RESET
TXRQ*
RXRQ**
XTLI
Crystal
XTL0
OR
CLKIN
Oscillator
RIN
TXA1
TXA2
Line
OH Interface
RINGD
/TALK
EYEXY
Optional
EYESYNC
Eye Pattern
EYECLK Generator
Speaker
SPKR
Amplifier
+5V
+3.3V
Power Supply
AGND
DGND
1176DG F2-1
Samsung Electronics
telephone
line
TIP
RING