Ricoh B039 Service Manual page 458

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
2 PSTN cable equalizer
to (rx mode: Internal)
3 Bit 3 Bit 2
0 0
0 1
1 0
1 1
4 PSTN cable equalizer
(V.8/V.17 rx mode: External)
0: Disabled
1: Enabled
5 PSTN cable equalizer
(V.34 rx mode; External)
6-7 Not used
SM
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.
•
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
Setting the modem and the telephone exchange.
None
Low Also, try using the cable equalizer if one or more of
Medium the following symptoms occurs.
•
High
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.
Keep this bit at "1".
This function should only be turned on in
environments where reception signal levels tend to
be low.
Do not change the settings.
5-41
BIT SWITCHES
COMMENTS
B404