Ricoh M0A0 Service Manual page 700

4.Service Tables
V.8 protocol on/off - G3 switch 03, bit 2
Bit 7
0
0
0
0
0
Other settings - Not used
G3 Switch 07 (SP No. 1-105-008)
No Function
0- PSTN cable equalizer
1 (TX mode: Internal)
Bit Bit 0 Setting
1
0 0 None
0 1 Low
1 0 Medium
1 1 High
2- PSTN cable equalizer
3 (RX mode: Internal)
Bit 3 Bit Setting
2
0 0 None
0 1 Low
1 0 Medium
1 1 High
4 PSTN cable equalizer
(V.8/V.17 RX mode:
External)
0: Disabled
1: Enabled
5 Not used
6 Parameter selection for
dial tone
74
Bit Bit Bit Types
6 5 4
0 0 1 V.27ter
0 1 0 V.27ter, V.29
0 1 1 V.27ter, V.29, V.33
1 0 0 V.27ter, V.29, V.17
1 0 1 V.27ter, V.29, V.17, V.34
Comments
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.
Use the dedicated transmission parameters for specific receivers.
Also, try using the cable equalizer if one or more of the following symptoms
occurs.
Communication error
Modem rate fallback occurs frequently.

This setting is not effective in V.34 communications.
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.
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.

This setting is not effective in V.34 communications.
Keep this bit at "1".
Do not change the settings.
0: This uses the fixed table in the ROM for dial tone detection.
1: This uses the specific parameter adjusted with SRAM (69ECBEH - 69ECDEH).