Sindoh M401 - Page 80

 RING’s analog signals received from TEL line are converted to digital signals.
 HSD’s digital signal is converted to an analog signal to send fax via TEL line.
 Power, clock and duplex data are exchanged between DAA and modem through DIB.
Pin Array
1. FAX-SYSTEMCARD (CN2)
NO.
Signal
Description
1
FAX_CS
Fax modem chip selection pin
2
COM1
GND
3
FAX_DI
Data signal pin to systemcard
4
COM1
GND
5
FAX_DO
Data signal pin from systemcard
6
COM1
GND
7
FAX_SCK
FAX_SPI communication standard
clock
8
COM1
GND
9
FAX_IRQ
FAX interrupt signal
10
5VIN
+5V
11
FAX_RESET
FAX reset signal
12
3.3V
+3.3V
13
3.3V
+3.3V
2. Phone line connection (J802)
NO.
Signal
Description
1
S.GND
SIGNAL GND
2
OT_1
Signal connected with no. 9 pin
3
T_1
Ring signal
4
R_1
TIP signal
5
OR_1
Signal connected with no. 6 pin
6
OT_2
Signal connected with no. 5 pin
7
T_2
TIP signal
8
R_2
Ring signal
9
OR_2
Signal connected with no. 2 pin