Ricoh M0A0 Service Manual page 728

4.Service Tables
No FUNCTION
4 Bit4 Bit3 Bit2 Bit1 Bit0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 1
0 1 1
1 1 1
5- Cable equalizer
7 Bit 7: 0, Bit 6: 0, Bit 5: 0 = None
Bit 7: 0, Bit 6: 0, Bit 5: 1 = Low
Bit 7: 0, Bit 6: 1, Bit 5: 0 = Medium
Bit 7: 0, Bit 6: 1, Bit 5: 1 = High
Bit 7: 1, Bit 6: 1, Bit 5: 1 = Disabled
No FUNCTION
0- Initial Tx modem rate
3
Bit3 Bit2 Bit1 Bit0 Bps
0 0 0
0 0 0
0 0 1
0 0 1
0 1 0
0 1 0
0 1 1
0 1 1
1 0 0
1 0 0
102
0 0 0
0 1 –1
1 0 –2
1 1 –3
0 0 –4
1 1 –15
1 1 Disabled
If training with a particular remote terminal always takes too long, the
initial modem rate may be too high. Reduce the initial Tx modem rate
using these bits.
0 Not
For the settings 14.4 or kbps slower, Switch 04 bit 4 must be changed
used
to 0.
1 2400
0 4800

1 7200
0 9600
1 12000
0 14400
1 16800
0 19200
1 21600
Switch 01
errors, the signal level may be inappropriate. Adjust the Tx level
for communications with that terminal until the results are better.
If the setting is "Disabled", the NCU parameter 01 setting is used.

Do not use settings other than listed on the left.
Use a higher setting if there is signal loss at higher frequencies
because of the length of wire between the modem and the
telephone exchange when calling the number stored in this
Quick/Speed Dial.
Also, try using the cable equalizer if one or more of the following
symptoms occurs.
Communication error with error codes such as 0-20, 0-23, etc.
Modem rate fallback occurs frequently.

Do not use settings other than listed on the left.
If the setting is "Disabled", the bit switch setting is used.
Switch 02
COMMENTS
Do not use settings other than listed on the left. If the setting is
"Disabled", the bit switch setting is used.
COMMENTS