Ricoh IM C300 Service Manual page 1561

5 Modem rate used for the next
page after receiving a
negative code (RTN or PIN)
0: No change 1: Fallback
6 Not used
7 Select detection of reverse
polarity in ringing
0: Off
1: On
G3 Switch 04 (SP No. 1-105-005)
No Function
0- Training error
3 detection threshold
4- Not used
7
G3 Switch 05 (SP No. 1-105-006)
No Function
0- Initial TX modem rate (kbps)
3
Bit 3 Bit Bit
2 1
0 0 0
0 0 1
0 0 1
0 1 0
0 1 0
0 1 1
0 1 1
1 0 0
D0CK
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
This switch is used to prevent reverse polarity in ringing on the
phone line (applied to PSTN-G3 ringing). Do not change this
setting
0: No detection
1: Detection (Japan and Korea only)
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.
Comments
These bits set the initial starting modem rate for
transmission.
Bit 0 kbps
Use the dedicated transmission parameters if you need to
change this for specific receivers.
1 2.4
If a modem rate 14.4 kbps or slower is selected, V.8
0 4.8
protocol should be disabled manually.
1 7.2
Cross reference
0 9.6
V.8 protocol on/off - G3 switch 03, bit 2
1 12.0
0 14.4
1 16.8
0 19.2
86
Bit Switches – 4
SM