BIT SWITCHES
B465 5-28 SM
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 will wait for the
second DIS which is caused by echo on the line.
1 Not used Do not change the setting.
2
V.8 protocol
0: Disabled
1: Enabled
0: V.8/V.34 communications will not be possible.
Note:
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.
3 ECM frame size
0: 256 bytes
1: 64 bytes
Keep this bit at “0” in most cases.
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 the 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
No. FUNCTION COMMENTS
0–3
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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