Brother DCP-7030 Service Manual page 294

<WSW50>
Selector No.
Percentage voltage for
interpreting the external
1
telephone as being hooked up
(based on the network's
2
standard voltage)
(Not used.)
DC mask curve table to be
3 applied when the line is
connected (Not used.)
AC impedance to be applied
4 when the line is connected
(Not used.)
Current control to be applied
5
immediately after connection of
6
the line (Not used.)
7
AC voltage threshold for
detection of ring (Not used.)
8
Note:
WSW50 is applicable to models equipped with SDAA circuits.
• Selectors 5 and 6: Current control to be applied immediately after connection of the
line (Not used.)
FAX models equipped with an SDAA circuit (on which an NTU chip is mounted) might not
be connected to a broad band line such as an ADSL (Asynchronous Digital Subscriber
Line) in a stable condition. If those models fail to connect to such a line, try to change the
current control to be applied immediately after connection of the line by using selectors 5
and 6.
If selectors 5 and 6 are set to "0" and "1," respectively, the SDAA draws more current,
decreasing the period required to terminate the current control. If they are set to "1" and
"0," the SDAA finely controls precision of the termination current against the voltage to
approach nearer to the specified DC curve that specifies the current vs. voltage
characteristics of the network termination. Selecting either control may solve an unstable
connection problem.
Function
No. 1 2
0: Apply the initial value specified by local
1: Apply table DC5 prepared specially
0: 600Ω termination
1: ZR termination
No. 5 6
No. 7 8
App. 1-55
Setting and Specifications
0 0: 50 %
0 1: 80 %
1 0: 30 %
1 1: No detection
regulations
0 0: Standard
0 1: Increase start-up current for
termination
1 0: Fine current control for
termination
1 1: Not used. (equal to "0, 0")
0 0: 19 V
0 1: 11 V
1 0: 25 V
1 1: 31 V
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