3-78
FAX-L350 Chapter 3: Maintenance and Service
SCNT board (J403)
¬ ®
NCU board (J2)
J403
J2
Signal name
Description
1
—
6
AGND
Ground
2
®
5
+5V
Not used
3
®
4
+12V
Analog device, Relay drive voltage
4
—
3
AIN
Line monitor signal
5
®
2
TX
Telephone line transmission signal
6
¬
1
RX
Telephone line reception signal
SCNT board (J404)
¬ ®
NCU board (J1)
J404
J1
Signal name
Description
1
—
23
DGND
Ground
2
¬
22
BIT3
for future use
3
¬
21
BIT2
for future use
4
¬
20
BIT1
for future use
5
—
19
LPL2
Not used
6
—
18
LPL1
Not used
7
—
17
HOOK2
Not used
8
¬
16
HOOK1
Telephone off hook detection signal
9
¬
15
CIOR
CI signal 1 (CI1 or CI2)
10
¬
14
CI2
CI detection signal 2
11
¬
13
CI1
CI detection signal 1
12
—
12
LPRD
Not used
13
®
11
DCRD
DC relay control signal
14
®
10
CMLD
CML relay control signal
15
®
9
HRD
H relay control signal
16
®
8
PRD
P relay control signal
17
®
7
SRD
S relay control signal
18
—
6
AGND
Ground
19
—
5
N.C.
Not used
20
®
4
+12V
+12V
21
®
3
+3.3V
Logic drive signal (for ESS)
22
®
2
+3.3V
Logic drive signal
23
—
1
DGND
Ground
Summary of Contents for FAX-L350
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