Ricoh D146 Service Manual page 1927

6 Not used
Select detection of reverse
polarity in ringing
7
0: Off
1: On
No Function
Training error detection
0-3
threshold
4-7 Not used
SM
Do not change the settings
This switch is used to prevent reverse polarity in
ringing on the phone line (applied to PSTN-G3
ringing). Do not change this setting
0: No detection
1: Detection (Japan and Korea only)
G3-2 Switch 04 (SP No. 1-106-005)
0 - F (Hex); 0 - 15 bits
If the number of error bits in the received TCF is
below this threshold, the machine informs the
sender that training has succeeded.
Do not change the settings.
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D163