Ricoh FAX2000L Service Manual page 101

BIT SWITCHES
G3 Switch 08
FUNCTION
0
PABX cable equalizer
(TX mode)
1 Bit 1 Bit 0
0 0
0 1
1 0
1 1
2 PABX cable equalizer
(RX mode)
3 Bit 3 Bit 2
0 0
0 1
1 0
1 1
4 PSTN external cable equalizer
(V.27ter, V.29, V.33/V.17, V.8
rx mode)
0: Disabled 1: Enabled
5 PSTN external cable equalizer
(V.34 rx mode)
0: Disabled 1: Enabled
6-7 Not used
G3 Switch 09 - Not used (do not change these settings)
Use a higher setting if there is signal loss at
higher frequencies because of the length of wire
Setting between the modem and the telephone
None exchange.
Low Use the dedicated transmission parameters if
Medium you need to change this for specific receivers.
High Also, try using the cable equalizer if one or more
of the following symptoms occurs:
• Communication error
• Modem rate fallback occurs frequently.
Note: This setting is ineffective in V.34
communications.
Use a higher setting if there is signal loss at
higher frequencies because of the length of wire
Setting
between the modem and the telephone
None exchange.
Low
Medium Also, try using the cable equalizer if one or more
High of the following symptoms occurs:
• Communication error with error codes such as
0-20, 0-23, etc.
• Modem rate fallback occurs frequently.
Note: This setting is ineffective in V.34
communications.
Set this bit to 0 when line quality is good.
(e.g. digital PABX)
Set this bit to 0 when line quality is good.
(e.g. digital PABX)
The V.34 modem rate may decrease from
equalizer over correction.
Do not change these settings.
COMMENTS
4-34
30 November, 1999