Brother International MFC-7050C Service Manual - Page 107

Modem, setting, Selectors, Cable, equalizer, Reception, level, through, Modem, attenuator

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Selector No. 1 2 3 4 5 8 WSW13 (Modem setting) Function Cable equalizer Reception level Modem attenuator Setting and Specifications No. 1 2 00 : 01 : 10 : 11 : No. 3 4 00 : 01 : 10 : 11 : 0: 0dB 0: 0 dB 0: 0 dB 0: 0 dB 0 km 0 km 7.2 km 7.2 km -43 dBm -47 dBm -49 dBm -51 dBm 1: 8 dB 1: 4 dB 1: 2 dB 1: 1 dB The modem should be adjusted according to the user's line conditions. • Selectors 1 and 2: Cable equalizer These selectors are used to improve the pass-band characteristics of analogue signals on a line. (Attenuation in the high-band frequency is greater than in the low-band frequency.) Set these selectors according to the distance from the telephone switchboard to the facsimile equipment. • Selectors 3 and 4: Reception level These selectors set the optimum receive signal level. • Selectors 5 through 8: Modem attenuator These selectors are used to adjust the transmitting level of the modem when the reception level at the remote station is improper due to line loss. This function applies for G3 protocol signals. Setting two or more selectors to "1" produces addition of attenuation assigned to each selector. V - 11

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WSW13
(Modem
setting)
Selector
No.
Function
Setting
and
Specifications
1
2
Cable
equalizer
No.
1
0
0
1
1
2
0
1
0
1
:
:
:
:
0
km
0
km
7.2
km
7.2
km
3
4
Reception
level
No.
3
0
0
1
1
4
0
1
0
1
:
:
:
:
-43
dBm
-47
dBm
-49
dBm
-51
dBm
5
8
Modem
attenuator
0:
0:
0:
0:
0dB
0
dB
0
dB
0
dB
1:
1:
1:
1:
8
dB
4
dB
2
dB
1
dB
The
modem
should
be
adjusted
according
to
the
user's
line
conditions.
•
Selectors
1
and
2:
Cable
equalizer
These
selectors
are
used
to
improve
the
pass
-band
characteristics
of
analogue
signals
on
a
line.
(Attenuation
in
the
high
-band
frequency
is
greater
than
in
the
low
-band
frequency.)
Set
these
selectors
according
to
the
distance
from
the
telephone
switchboard
to
the
facsimile
equipment.
•
Selectors
3
and
4:
Reception
level
These
selectors
set
the
optimum
receive
signal
level.
•
Selectors
5
through
8:
Modem
attenuator
These
selectors
are
used
to
adjust
the
transmitting
level
of
the
modem
when
the
reception
level
at
the
remote
station
is
improper
due
to
line
loss.
This
function
applies
for
G3
protocol
signals.
Setting
two
or
more
selectors
to
"1"
produces
addition
of
attenuation
assigned
to
each
selector.
V
-
11