Ricoh B022, Service Manual, Page: 664 / 878

BIT SWITCHES
B418 3-42 SM
G3 Switch 06 SP No. 1-105-007
No FUNCTION COMMENTS
4
to
7
Modem types available for
reception
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
V.33
0 1 0 0 V.27ter, V.29,
V.17/V.33
0 1 0 1 V.27ter, V.29,
V.17/V33,
V.34
Other settings - Not used
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.
Cross reference
V.8 protocol on/off - G3 switch 03, bit2
G3 Switch 07 SP No. 1-105-008
No FUNCTION COMMENTS
0
to
1
PSTN cable equalizer
(tx mode: Internal)
Bit 1 Bit 0
Setting
0 0 None
0 1 Low
1 0 Medium
1 1 High
Use a higher setting if there is signal loss at higher
frequencies because of the length of wire between
the modem and the telephone exchange.
Use the dedicated transmission parameters for
specific receivers.
Also, try using the cable equalizer if one or more of
the following symptoms occurs.
•
Communication error
•
Modem rate fallback occurs frequently.
Note: This setting is not effective in V.34
communications.
2
to
3
PSTN cable equalizer
(rx mode: Internal)
Bit 3 Bit 2
Setting
0 0 None
0 1 Low
1 0 Medium
1 1 High
Use a higher setting if there is signal loss at higher
frequencies because of the length of wire between
the modem and the telephone exchange.
Also, try using the cable equalizer if one or more of
the following symptoms occurs.
•
Communication error with error codes such as
0-20, 0-23, etc.
•
Modem rate fallback occurs frequently.
Note: This setting is not effective in V.34
communications.
4
PSTN cable equalizer
(V.8/V.17 rx mode: External)
0: Disabled
1: Enabled Keep this bit at “1”.
5 PSTN cable equalizer
(V.34 rx mode; External) Keep this bit at “1”.
6-
7
Not used Do not change the settings.