Ricoh B121 Service Manual page 483

G3-1 Switch 07
No FUNCTION
0 PSTN cable equalizer
to (tx mode: Internal)
1 Bit 1 Bit 0 Setting
0 0 None
0 1 Low
1 0 Medium
1 1 High
2 PSTN cable equalizer
to (rx mode: Internal)
3 Bit 3 Bit 2 Setting
0 0 None
0 1 Low
1 0 Medium
1 1 High
4-7 Not used
G3-1 Switch 08 - Not used (Do not change the settings.)
G3-1 Switch 09 - Not used (Do not change the settings.)
SM
COMMENTS
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.
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.
Do not change the settings.
45
BIT SWITCHES
SP No. 1-105-008
B620