Ricoh B230 Service Manual page 1032

Bit Switches
DIS detection number
(Echo countermeasure)
0
0: 1
1: 2
1 Not used
V.8 protocol
2 0: Disabled
1: Enabled
ECM frame size
3 0: 256 bytes
1: 64 bytes
CTC transmission conditions
0: After one PPR signal
4 received
1: After four PPR signals
received (ITU-T standard)
Modem rate used for the next
page after receiving a
5
negative code (RTN or PIN)
0: No change, 1: Fallback
6 Not used
7 Not used
G3-2 Switch 04 [SP No. 1-106-005]
No FUNCTION
Training error detection
0-3
threshold
4-7 Not used
B786
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.
Do not change the settings.
0: V.8/V.34 communications will not be possible.
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.
Keep this bit at "0" in most cases.
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.
NTransmit- Number of transmitted frames
NResend- 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.
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.
Do not change the settings.
Do not change the settings.
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 training has succeeded.
Do not change the settings.
82 SM