Ricoh S-C4.5 Field Service Manual page 394

5. Appendix: Fax Service Program
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)
5
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)
G3 Switch 0A [SP No. 1-105-011]
No
198
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.
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.
FUNCTION COMMENTS