Ricoh M0A0 - Page 698

4.Service Tables
72
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
Select detection of reverse
polarity in ringing
0: Off
1: On
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)
G3 Switch 04 (SP No. 1-105-005)
No
Function
Comments
0-
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.
G3 Switch 05 (SP No. 1-105-006)
No
Function
Comments
0-
3
Initial TX modem rate (kbps)
These bits set the initial starting modem rate for transmission.
Use the dedicated transmission parameters if you need to change this
for specific receivers.
If a modem rate 14.4 kbps or slower is selected, V.8 protocol should
be disabled manually.
Cross reference
V.8 protocol on/off - G3 switch 03, bit 2
Bit 3
Bit
2
Bit
1
Bit 0
kbps
0
0
0
1
2.4
0
0
1
0
4.8
0
0
1
1
7.2
0
1
0
0
9.6
0
1
0
1
12.0
0
1
1
0
14.4
0
1
1
1
16.8
1
0
0
0
19.2
1
0
0
1
21.6
1
0
1
0
24.0
1
0
1
1
26.4
1
1
0
0
28.8
1
1
0
1
31.2