Ricoh FAX2900L Service Manual page 117

21 May, 1999
G3 Switch 03
No FUNCTION
0 DIS detection number
(Echo countermeasure)
0: 1
1: 2
1 Not used
2 V.8 protocol
0: Disabled
1: Enabled
3 ECM frame size
0: 256 bytes
1: 64 bytes
4 CTC transmission conditions
0: Ricoh mode (PPR x 1)
1: ITU-T mode (PPR x 4)
5
Modem rate for the next page
after receiving a negative code
(RTN or PIN)
0: No change 1: Fallback
6 Not used
7 Polarity change after DIS/NSF
detection
0: Disabled 1: Enabled
G3 Switch 04
FUNCTION
0 Training error detection
to threshold
3
4-7 Not used
COMMENTS
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.
Do not change this setting.
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.
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.
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.
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.
Do not change this setting.
This bit should be set to "1" only to deal with
communication problems caused by certain
types of exchanger.
COMMENTS
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.
Do not change these settings.
4-37
BIT SWITCHES