Ricoh Type M12 Field Service Manual page 151

PSTN cable equalizer
(rx mode: Internal)
Bit 3
0
2-3 0
1
1
PSTN cable equalizer
(V.8/V.17 rx mode: External)
4
0: Disabled
1: Enabled
5-7 Not used
G3-2 Switch 08 - Not used (do not change the settings)
G3-2 Switch 09 - Not used (do not change the settings)
No
Maximum allowable carrier drop during
image data reception
Bit 1 Bit 0
0 0
0-1
0 1
1 0
1 1
2-3 Not used
Bit 2 Setting
0 None
1 Low
0 Medium
1 High
G3-2 Switch 0A (SP No. 1-106-011)
Function
Value (ms)
200
400
800
Not used
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.
Comments
These bits set the acceptable modem carrier
drop time.
Try a longer setting if error code 0-22 is
frequent.
Do not change the settings
Bit Switches - 5
149