Brother Intelli FAX-2820, Service Manual

Page: 310 / 321

App. 4-54 Confidential
WSW50
(SDAA settings)
Selector
No.
Function Setting and Specifications
1
2
Percentage voltage for
interpreting the external
telephone as being hooked up
(based on the network's
standard voltage) (Not used.)
No. 1 2
0
0 : 80%
0 1 : 90%
1 0 : 70%
1 1 : No detection
3
DC mask curve table to be
applied when the line is
connected (Not used.)
0: Apply the initial value specified by local
regulations
1: Apply table DC5 prepared specially
4
AC impedance to be applied
when the line is connected
(Not used.)
0: 600
Ω
termination
1: ZR termination
5
6
Current control to be applied
immediately after
connection of the line
(Not used.)
No. 5 6
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")
7
8
AC voltage threshold for
detection of ring
(Not used.)
No. 7 8
0
0 : 19 V
0 1 : 11 V
1 0 : 25 V
1 1 : 31 V
NOTE: WSW50 is applicable to models equipped with SDAA circuits.
NOTE: The machine does not support the SDAA.
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.