Ricoh M281 Series Service Manual page 938

Bit Switches - 3
Communication Switch 19 - Not used (do not change the settings)
Communication Switch 1A - Not used (do not change the settings)
Communication Switch 1B (SP No. 1-104-028)
No Function
0-7 Extension access code (0 to 7)
to turn V.8 protocol On/Off
0: On
1: Off
Communication Switch 1C (SP No. 1-104-029)
No Function
0-1 Extension access code (8 and
9) to turn V.8 protocol On/Off
0: On
1: Off
2-7 Not used
Communication Switch 1D - Not used (do not change the settings)
Communication Switch 1E - Not used (do not change the settings)
Communication Switch 1F - Not used (do not change the settings)
D255/D256 FAX OPTION
Comments
If the PABX does not support V.8/V.34 protocol
procedure, set this bit to "1" to disable V.8.
Example: If "0" is the PSTN access code, set bit 0
to 1. When the machine detects "0" as the first
dialed number, it automatically disables V.8
protocol. (Alternatively, if "3" is the PSTN access
code, set bit 3 to 1.)
Comments
Refer to communication switch 1B.
Example: If "8" is the PSTN access code, set bit 0
to 1. When the machine detects "8" as the first
dialed number, it automatically disables V.8
protocol. (If "9" is the PSTN access code, use bit
1.)
Do not change the settings.
104 SM