Sindoh M611 - Page 80

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 Important Functions of LSD (DAA CX20548)
 This converts the analog signals of RING received through TEL LINE to digital
signals.
 HSD digital signals are converted to analog signals and are Fax transmitted through
TEL LINE.
 Power, clock, bi-directional data and DAA can be exchanged between modem
through DIB.
Pin Array
1. FAX-SYSTEMCARD (CN2)
NO.
Signal
Description
1
FAX_CS
FAX modem chip selection
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 criterial 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. Connecting TEL Line (J802)
NO.
Signal
Description
1
S.GND
SIGNAL GND
2
OT_1
Signal connected to 9th pin
3
T_1
RING signal
4
R_1
TIP signal