Brother FAX 1840C, Service Manual

Page: 353 / 401

App. 4-41 Confidential
WSW38
(V.34 transmission settings)
Selector
No.
Function Setting and Specifications
1
2
Setting of the equalizer
No. 1 2
0 X : Automatic
1 0 : Fixed to 4 points
1 1 : Fixed to 16 points
3
Sending level of guard tone at phase
2
0: Normal - 7 db 1: Normal
4
Stepping down the transmission
speed at fallback each
0: 2400 bps 1: 4800 bps
5
6
Automatic control of modem's
EQM gain for proper transmission
speed choice
No. 5 6
0 0 : For higher transmission speed
than the current setting
0 1 : No change from the current
setting
1 0 : For lower transmission speed
than the current setting
1 1 : For further lower transmission
than the setting made by 1, 0
7
Redialing when a communications
error occurs
0: ON 1: OFF
8
Detection of CED for stopping
CNG
0: ON 1: OFF
NOTE: WSW38 takes effect only when the V.34 mode is permitted (WSW19, selector 7) in models
supporting V.34 mode.
l Selectors 1 and 2: Setting of the equalizer
These selectors set the equalizer's training level to be applied if the machine fails to send training due
to weak line connection. If these selectors are set to "0, X," the modem will automatically set the
appropriate training level.
l Selector 3: Sending level of guard tone at phase 2
This selector sets the sending level of guard tone for 1800 Hz to be sent at Phase 2 in the V. 34 mode.
l Selector 4: Stepping down the transmission speed at fallback each
This selector determines how much the modem steps down the transmission speed at fallback when
called by the remote station. If this selector is set to "1," the modem may step down the transmission
speed from 33600 bps to 28800 bps by one-time fallback.
l Selectors 5 and 6: Automatic control of modem's EQM gain for proper transmission speed choice
These selectors determine how the modem controls the EQM (Eye Quality Monitor) gain for proper
choice of the transmission speed, which applies if the modem selects higher transmission speed than
the possible speed so that it always repeats falling back.
l Selector 8: Detection of CED for stopping CNG
If this selector is set to "0," the detection time of CED specified by WSW43, selectors 4 and 5 will
apply.