Ricoh D197 Service Manual page 1484

Bit Switches - 4
No
PSTN cable equalizer
(tx mode: Internal)
Bit 1 Bit 0
0 0
0 1
0-1
1 0
1 1
PSTN cable equalizer
(rx mode: Internal)
Bit 3
0
0
2-3
1
1
PSTN cable equalizer
(V.8/V.17 rx mode: External)
4
0: Disabled
1: Enabled
D3A5
G3 Switch 07 (SP No. 1-105-008)
Function
Setting
None
Low
Medium
High
Bit 2 Setting
0 None
1 Low
0 Medium
1 High
Comments
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.
Use the dedicated transmission
parameters for specific receivers.
Also, try using the cable equalizer if one
or more of the following symptoms
occurs.
Communication error
Modem rate fallback occurs frequently.

This setting is not effective in
V.34 communications.
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".
132 SM