Ricoh Type M12 Field Service Manual page 141

PSTN cable equalizer
(rx mode: Internal)
Bit 3 Bit 2
0
2-3 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)
No
Setting
0 None
1 Low
0 Medium
1 High
G3 Switch 0A (SP No. 1-105-011)
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
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
Bit Switches - 4
139