Ricoh D127, Field Service Manual

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2-3
PSTN cable equalizer
(rx mode: Internal)
Bit 3: 0, Bit 2: 0 = None
Bit 3: 0, Bit 2: 1 = Low
Bit 3: 1, Bit 2: 0 = Medium
Bit 3: 1, Bit 2: 1 = High
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
4
PSTN cable equalizer
(V.8/V.17 rx mode: External)
0: Disabled
1: Enabled
Keep this bit at “1”.
5 Not used Do not change the settings.
6
Parameter selection for dial tone detection
0: Normal parameter
1: Specific parameter
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.
7 Not used Do not change the settings.
G3 Switch 08 - Not used (do not change the settings)
G3 Switch 09 [SP No. 1-105-008]
No FUNCTION COMMENTS
5. Appendix: Fax Service Program
232