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EU/AU/AS/C models
NCU board
Line current
detection
circuit
RLY3
+12V
CML relay
1
R26
Lb
4
4
Line
La
3
9
2
a2
External
telephone
5
b2
The line path switching control circuit consists of the CML relay (RLY3) and analog switch (IC3, IC5) on
the NCU board, the ASIC (IC29 [IC26]) on the FAX board, and the other peripheral devices. It changes
the path for the FAX send/receive signals and connects it to each control circuit.
The CML relay is switched according to the CML1 signal output from the ASIC on the FAX board. When
the CML1 signal goes HIGH, Q4 comes on to turn ON the CML relay.
The analog switch (IC3) is switched according to the CML1 signal and ATT3DB1 signal. When the
CML1 signal or ATT3DB1 signal goes HIGH, the analog switch is turned ON.
The analog switch (IC5) is switched according to the RLADJ11 and RLADJ12 signals.
The analog switch is switched according to the states of the RLADJ11 and RLADJ21 signals.
Turning ON the CML relay and analog switch allow the MODEM to be connected to the line.
Signal Name
Type
CML1
O
ATT3DB1
O
RLADJ11, 21
O
* Values in [ ] are for GD-1250/1270 in case that the descriptions vary between GD-1210 and GD-
1250/1270.
GD-1210/1250/1270/1160/1260
ELECTRICAL CIRCUITS
Q4
AG
12
C7
R28
T1
1
5
0
3
R29
RLY4
C13
1
8
0
10
Relay
R31
R36
2
3
AG
C12
+12V
4
1
R32
R30
C14
4
Q9
Ring signal
detection
AG
circuit
Fig. 4-6
Active
H
Line 1 CML Relay Control Signal
H
Line 1 Attenuator Control Signal
H
Line 1 Return Loss Adjustment Signal
08/04
IC5
Analog switch
13
0
14
1
IC6
3
1
2
15
2
16
3
11
IC3
11
10
10
Analog
switch
R11
1
1
15
2
0
IC6
5
7
13
1
14
0
12
IC7
1
2
Description
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4 - 6
FAX board
CML1
3
3
21
IC29
ATT3DB1
6
6
22
[ IC26 ]
RLADJ11
7
7
24
ASIC
RLADJ21
8
8
25
1
1
TXOUT1
28,29
IC12
[ IC9 ]
IC4
MODEM
RXIN1
6
7
2
2
32
Destination
RLY3, IC3
IC3
IC5
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