Ricoh D117 Service Manual page 1166

PSTN cable equalizer
(rx mode: Internal)
Bit 3 Bit 2
0 0
0 1
2-3
1 0
1 1
PSTN cable equalizer
(V.8/V.17 rx mode: External)
4
0: Disabled
1: Enabled
5 Not used
Parameter selection for dial tone
detection
6
0: Normal parameter
1: Specific parameter
7 Not used
G3 Switch 08 - Not used (do not change the settings)
G3 Switch 09 - Not used (do not change the settings)
SM
Use a higher setting if there is signal loss
at higher frequencies because of the
length of wire between the modem and
Setting
the telephone exchange.
Also, try using the cable equalizer if one
None
or more of the following symptoms
Low
occurs.
Communication error with error codes
Medium
such as 0-20, 0-23, etc.
High
Modem rate fallback occurs frequently.
This setting is not effective in
V.34 communications.
Keep this bit at "1".
Do not change the settings.
0: This uses the fixed table in the ROM
for dial tone detection.
1: This uses the specific parameter
adjusted with SRAM (69ECBEH -
69ECDEH). Select this if the dial tone
cannot be detected when the "Normal
parameter: 0" is selected.
Do not change the settings.
109
Bit Switches
D649