Ricoh B291 Service Manual page 808

BIT SWITCHES
G3 Switch 06
No FUNCTION
0 Initial Rx modem rate
to Bit 3 2 1 0 Setting (bps)
3 0 0 0 1 2.4 k
0 0 1 0 4.8 k
0 0 1 1 7.2 k
0 1 0 0 9.6 k
0 1 0 1 12.0 k
0 1 1 0 14.4 k
0 1 1 1 16.8 k
1 0 0 0 19.2 k
1 0 0 1 21.6 k
1 0 1 0 24.0 k
1 0 1 1 26.4 k
1 1 0 0 28.8 k
1 1 0 1 31.2 k
1 1 1 0 33.6 k
Other settings - Not used
4 Modem types available for
to reception
7 Bit 7 6 5 4 Setting
0 0 0 1 V.27ter
0 0 1 0 V.27ter, V.29
0 0 1 1 V.27ter, V.29
0 1 0 0 V.27ter, V.29,
0 1 0 1 V.27ter, V.29,
Other settings - Not used
G3 Switch 07
No FUNCTION
0 PSTN cable equalizer
to (tx mode: Internal)
1 Bit 1 Bit 0
0 0
0 1
1 0
1 1
B779
CÓPIA NÃO CONTROLADA
These bits set the initial starting modem rate for
reception.
Use a lower setting if high speeds pose problems
during reception.
If a modem rate 14.4 kbps or slower is selected, V.8
protocol should be disabled manually.
Cross reference
V.8 protocol on/off - G3 switch 03, bit2
The setting of these bits is used to inform the
transmitting terminal of the available modem type for
the machine in receive mode.
If V.34 is not selected, V.8 protocol must be
disabled manually.
V.33
Cross reference
V.17/V.33
V.8 protocol on/off - G3 switch 03, bit2
V.17/V33,
V.34
Use a higher setting if there is signal loss at higher
frequencies because of the length of wire between
Setting the modem and the telephone exchange.
None Use the dedicated transmission parameters for
Low specific receivers.
Medium
High Also, try using the cable equalizer if one or more of
the following symptoms occurs.
•
•
Note: This setting is not effective in V.34
communications.
CÓPIA NÃO CONTROLADA
COMMENTS
COMMENTS
Communication error
Modem rate fallback occurs frequently.
70
SP No. 1-105-007
SP No. 1-105-008
SM