Ricoh B121 Service Manual page 478

BIT SWITCHES
Communication Switch 15 - Not used (Do not change the settings.)
Communication Switch 16 - Not used (Do not change the settings.)
Communication Switch 17 - Not used (Do not change the settings.)
Communication Switch 18 - Not used (Do not change the settings.)
Communication Switch 19 - Not used (Do not change the settings.)
Communication Switch 1A - Not used (Do not change the settings.)
Communication Switch 1B
No FUNCTION
0 Extension access code (0 to 7)
to to turn V.8 protocol On/Off
7 0: On
1: Off
Communication Switch 1C
No FUNCTION
0 Extension access code (8 and
to 9) to turn V.8 protocol On/Off
1 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.)
B620
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 1E.
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.
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SP No. 1-104-028
SP No. 1-104-029
B620