Ricoh D649 Field Service Manual page 106

4. Service Tables
Modem types available for reception
The setting of these bits is used to inform the transmitting terminal of the available modem type
for the machine in receive mode.
If V.34 is not selected, V.8 protocol must be disabled manually.
Cross reference
V.8 protocol on/off - G3 switch 03, bit 2
Bit 7
4-7
0
0
0
0
0
Other settings - Not used
No
PSTN cable equalizer
(tx mode: Internal)
Bit 1
0
0
0-1
1
1
104
Bit 6 Bit 5 Bit 4
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
G3 Switch 07 (SP No. 1-105-008)
Function
Bit 0 Setting
0 None
1 Low
0 Medium
1 High
Types
V.27ter
V.27ter, V.29
V.27ter, V.29, V.33
V.27ter, V.29, V.17/V.33
V.27ter, V.29, V.17/V33, V.34
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.