Ricoh D037 Service Manual page 1120

Bit Switches
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 - Not used (do not change the settings)
G3 Switch 0A [SP No. 1-105-011]
No FUNCTION
Maximum allowable carrier
drop during image data
0-1
reception
Bit 1: 0, Bit 0: 0 = 200 (ms)
D432/D433
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
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.
COMMENTS
These bits set the acceptable modem carrier drop
time.
Try using a longer setting if error code 0-22 is
frequent.
94 SM