Ricoh M0A0 Service Manual page 689

Communication Switch 01 (SP No. 1-104-002)
No Function
0 ECM
0: Off 1: On
1 Not used
2- Wrong connection
3 prevention method
Bit 3 Bit 2 Setting
0 0 None
0 1 8 digit CSI
1 0 4 digit CSI
1 1 CSI/RTI
4- Not used
5
6- Maximum printable page
7 length available
Bit 7 Bit Setting
6
0 0 No limit
0 1 B4 (364 mm)
1 0 A4 (297 mm)
1 1 Not used
Communication Switch 02 (SP No. 1-104-003)
No Function
0 G3 Burst error threshold
0: Low 1: High
1 Acceptable total error line ratio
0: 5% 1: 10%
Comments
If this bit is set to 0, ECM is switched off for all communications.
In addition, V.8 protocol and JBIG compression are switched off automatically.
Do not change the setting.
(0,1): The machine will disconnect the line without sending a fax message, if
the last 8 digits of the received CSI do not match the last 8 digits of the dialed
telephone number. This does not work when manually dialed.
(1,0): The same as above, except that only the last 4 digits are compared.
(1,1): The machine will disconnect the line without sending a fax message, if
the other end does not identify itself with an RTI or CSI.
(0,0): Nothing is checked; transmission will always go ahead.

This function does not work when dialing is done from the external
telephone.
Do not change the setting.
The setting determined by these bits is informed to the transmitting terminal in
the pre-message protocol exchange (in the DIS/NSF frames).
Comments
If there are more consecutive error lines in the received page than the
threshold, the machine will send a negative response. The Low and
High threshold values depend on the sub-scan resolution, and are as
follows.
100 dpi
200 dpi
300 dpi
400 dpi
If the error line ratio for a page exceeds the acceptable ratio, RTN will
be sent to the other end.
4.Service Tables
6(L) 12(H)
12(L) 24(H)
18(L) 36(H)
24(L) 48(H)
63