Ricoh D127 Field Service Manual page 440

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)
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 [SP No. 1-105-008]
No
232
FUNCTION
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.
COMMENTS