Brother MFC 1870MC, Service Manual, Page: 127 / 217

V –
32
WSW19
(Transmission speed setting)
Function
Selector
No.
No. 1 2 3
No. 4 5 6
0 0 0 : 2,400 bps
0 0 1 : 4,800 bps
0 1 0 : 7,200 bps
0 1 1 : 9,600 bps
1 0 0 : 12,000 bps
1 0 1 :
1 1 0 : 14,400 bps
1 1 1 :
Setting and Specifications
Last transmission speed choice
for fallback
First transmission speed choice
for fallback
1
|
3
4
|
6
*
*
7
8
Not used.
V. 17 mode 0: Permitted 1: Prohibited
* In those models with a maximum of 9600 bps capability, selection of 12,000 bps or 14,400 bps will
still only produce a set speed automatically reduced to 9600 bps.
●
Selectors 1 through 6: First and last choices of transmission speed for fallback
These selectors are used to set the MODEM speed range. With the first transmission speed
choice specified by selectors 1 through 3, the equipment attempts to synchronize the data
transmission via the MODEM. If the synchronization fails, the equipment automatically steps
down to the next lowest speed and attempts to synchronize the data transmission again.
The equipment repeats this sequence while stepping down the transmission speed to the
last choice specified by selectors 4 through 6.
If the MODEM always falls back to a low transmission speed (e.g., 4,800 bps), set the first
transmission speed choice to the lower one (e.g., modify it from 12,000 bps to 7,200 bps) in
order to deactivate the high-speed MODEM function and reduce the training time for shorter
transmission time.
Generally, to save the transmission time, set the last transmission speed choice to a higher
one.