Ricoh D158 Service Manual page 935

No Function
G3 protocol mode used
0 0: Standard and non-standard
1: Standard only
Short preamble
7
0: Disabled 1: Enabled
No Function
DIS detection number
(Echo countermeasure)
0
0: 1
1: 2
V.8 protocol
2 0: Disabled
1: Enabled
ECM frame size
3 0: 256 bytes
1: 64 bytes
SM
G3 Switch 02 (SP No. 1-105-003)
Change this bit to 1 only when the other end can
only communicate with machines that send
T.30-standard frames only.
1: Disables NSF/NSS signals (these are used in
non-standard mode communication)
Refer to Appendix B in the Group 3 Facsimile
Manual for details about Short Preamble.
G3 Switch 03 (SP No. 1-105-004)
0: The machine will hang up if it receives the
same DIS frame twice.
1: Before sending DCS, the machine will wait for
the second DIS which is caused by echo on the
line.
0: V.8/V.34 communications will not be possible.

Do not set to 0 unless the line condition
is always bad enough to slow down the
data rate to 14.4 kbps or lower.
Keep this bit at "0" in most cases.
93
Bit Switches - 4
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