30 November, 1999 BIT SWITCHES
4-31
Service
Tables
G3 Switch 02
No FUNCTION COMMENTS
6 AI short protocol (transmission
and reception)
0: Disabled 1: Enabled
Refer to Appendix B in the Group 3 Facsimile
Manual for details about AI Short Protocol.
7
Not used Do not change this setting.
G3 Switch 03
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 waits for
the second DIS, caused by echo on the line.
1
Not used Do not change this setting.
2
V.8 protocol
0: Disabled
1: Enabled
0: V.8/V.34 communications will not be possible.
Note: Do not change this setting unless the line
condition is so poor the data rate slows to 14.4
kbps or lower.
3
ECM frame size
0: 256 bytes
1: 64 bytes
1: The machine transmits with a frame size of
64 bytes. Set this bit to 1 when the other
terminal only has a 64 byte frame size.
4
CTC transmission conditions
0: Ricoh mode (PPR x 1)
1: ITU-T mode (PPR x 4)
When using ECM, the machine will choose a
slower modem rate after receiving PPR once
(Ricoh mode) or four times (ITU-T mode).
This bit is ineffective in V.34 communications.
5
Modem rate for the next page
after receiving a negative code
(RTN or PIN)
0: No change 1: Fallback
1: The TX modem rate of the machine will fall
back before sending the next page if it receives
a negative code. This bit is ignored if ECM is in
use.
6
Not used Do not change this setting.
7
Polarity change after DIS/NSF
detection
0: Disabled 1: Enabled
This bit should be set to ”1” only to deal with
communication problems caused by certain
types of exchanger.
G3 Switch 04
FUNCTION COMMENTS
0
to
3
Training error detection
threshold
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 the training was successful.
4-7
Not used Do not change these settings.
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