Ricoh Aficio MP201SPF Service Manual page 488

Bit Switches
G3 Switch 07 [SP No. 1-105-008]
No FUNCTION
PSTN cable equalizer
(tx mode: Internal)
Bit 1: 0, Bit 0: 0 = None
0-1
Bit 1: 0, Bit 0: 1 = Low
Bit 1: 1, Bit 0: 0 = Medium
Bit 1: 1, Bit 0: 1 = High
PSTN cable equalizer
(rx mode: Internal)
Bit 3: 0, Bit 2: 0 = None
2-3
Bit 3: 0, Bit 2: 1 = Low
Bit 3: 1, Bit 2: 0 = Medium
Bit 3: 1, Bit 2: 1 = High
PSTN cable equalizer
(V.8/V.17 rx mode: External)
4
0: Disabled
1: Enabled
5 Not used
D115/D116
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.
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.
This setting is not effective in V.34
communicatio
Keep this bit at "1".
Do not change the settings.
5-50 SM Appendix