BIT SWITCHES
14 June, 2002
5-54
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.
