Ricoh B039 Service Manual page 455

BIT SWITCHES
G3 Switch 03
No FUNCTION
0 DIS detection number
(Echo countermeasure)
0: 1
1: 2
1 V.8 protocol in manual
reception
0: Disabled
1: Enabled
2 V.8 protocol
0: Disabled
1: Enabled
3 ECM frame size
0: 256 bytes
1: 64 bytes
4 CTC transmission conditions
0: After one PPR signal
received
1: After four PPR signals
received (ITU-T standard)
5 Modem rate used for the next
page after receiving a negative
code (RTN or PIN)
0: No change
6 V.8 protocol in manual
transmission
0: Disabled
1: Enabled
7 Not used
B404
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.
0: The machine sends CED instead of ANSam
when starting a manual reception.
1: The machine sends ANSam during manual
reception.
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.
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.
N
Transmit-
N
Resend
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.
1: Fallback
1: The machine detects either ANSam or CED
during manual transmission.
Do not change the setting.
5-38
COMMENTS
Number of transmitted frames
- Number of frames to be retransmitted
SM