BIT SWITCHES
21 December, 2001
3-48
G3-2 Switch 03
SP No. 1-106-004
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
Not used
Do not change the settings.
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:
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.
N Transmit N
send
≤
Re
N
Transmit-
Number of transmitted frames
N
Resend
- Number of frames to be retransmitted
1:
When using ECM, the machine sends a CTC to
drop back the modem rate after receiving four
PPRs.
PPR, CTC: These are ECM protocol signals.
This bit is not effective in V.34 communications.
5
Modem rate used for the next
page after receiving a negative
code (RTN or PIN)
0:
No change
1:
Fallback
1:
The machine’s tx modem rate will fall back before
sending the next page if a negative code is
received. This bit is ignored if ECM is being used.
6
Not used
Do not change the settings.
7
Not used
Do not change the settings.
G3-2 Switch 04
SP No. 1-106-005
No
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 training has succeeded.
4-7
Not used
Do not change the settings.
