Ricoh Aficio MP C3001 Service Manual page 1944

Bit Switches
No.
Modem bit rate setting for reception
0-3
Sets the modem bit rate for reception. The default is "0110" (14.4K bps).
Modem setting for reception
Sets the modem type for reception. The default is "0100" (V27ter, V29, V17).
Bit 7
0
4-7
0
0
0
Other settings - Not used
D545
Function
Bit 6 Bit 5
0 0
0 1
0 1
1 0
Comments
Bit 4
1 V.27ter
0 V.27ter, V.29
1 V.27ter, V.29, V.33
0 V.27ter, V.29, V.17/V.33
140
Types
SM