Ricoh D0C8, Service Manual

Page: 1560 / 1647

Bit Switches – 4
SM 85 D0CK
6 Forbid
CED/ANsam
output
0: Off
1: On (Forbid
output)
Do not change this setting (Default: 0: Off), unless communication problem
is caused by a CED or ANSam transmission.
7 Not used Do not change this setting.
G3 Switch 02 (SP No. 1-105-003)
No Function Comments
0 G3 protocol mode
used
0: Standard and
non-standard
1: Standard only
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)
1-
6
Not used Do not change the settings.
7 Short preamble
0: Disabled 1:
Enabled
Refer to Appendix B in the Group 3 Facsimile Manual for details about
Short Preamble.
G3 Switch 03 (SP No. 1-105-004)
No Function Comments
0 DIS detection number
(Echo countermeasure)
0: 1
1: 2
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.
1-
2
Not Used Do not change the settings.
3 ECM frame size
0: 256 bytes
1: 64 bytes
Keep this bit at "0" in most cases.
4 CTC transmission conditions
0: After one PPR signal
received
1: After four PPR signals
received (ITU-T standard)
0: When using ECM in non-standard (NSF/NSS) mode, the
machine sends a CTC to drop back the modem rate after
receiving a PPR, if the following condition is met in
communications at 14.4, 12.0, 9.6, and 7.2 kbps.