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4.2.5
CI detection circuit
NA/TW models
NCU board
+12V
RLY2
CML relay
1
1
4
Lb
9
0
Line
1
3
La
4
0
The CI detection circuit consists of the photocoupler (PC2), ASIC (IC29 [IC26]) on the FAX board and
the other peripheral devices to detect a ring signal input from the telephone line.
The ASIC makes the CML1 signal become LOW to connect the CI detection circuit to the telephone
line.
When a ring signal is input from the telephone line, the photocoupler is repeatedly turned ON/OFF. This
allows the CI1 signal to become a pulse signal and input to the ASIC on the FAX board, thereby detect-
ing the ring signal.
Signal Name
Type
CI1
I
* Values in [ ] are for GD-1250/1270 in case that the descriptions vary between GD-1210 and GD-
1250/1270.
© 2006 - 2011 TOSHIBA TEC CORPORATION All rights reserved
12
10
ZD1
ZD3
C1
R2
3
D52
Fig. 4-11
Active
-
Line 1 CI Detect Signal
4 - 11
08/04
FAX board
3
3
Q51
5VPS
AG
R79
17
17
1
4
PC2
2
3
SG
Description
CML1
21
IC29
[ IC26 ]
ASIC
CI1
4
Destination
IC29 [IC26]
GD-1210/1250/1270/1160/1260
ELECTRICAL CIRCUITS
4
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