BIT SWITCHES
SM 5-31 B465
Fax Unit
B465
G3 Switch 08
No. FUNCTION COMMENTS
0, 1 PABX cable equalizer
(tx mode: Internal)
Bit 1 Bit 0 Setting
00None
0 1 Low
1 0 Medium
11High
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.
Note: This setting is not effective in V.34
communications.
2, 3 PABX cable equalizer
(rx mode: Internal)
Bit 3 Bit 2 Setting
00None
0 1 Low
1 0 Medium
11High
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.
Note: This setting is not effective in V.34
communications.
4 PABX cable equalizer
(V.27ter, V.29, V.33/V.17, V.8 rx
mode: External)
0: Disabled 1: Enabled
Set this bit to 0 when line quality is good.
(e.g. for a digital PABX)
5–7 Not used Do not change these settings.
G3 Switch 09 - Not used (do not change any of these settings)
G3 Switch 0A
No. FUNCTION COMMENTS
0, 1
Maximum allowable carrier
drop during image data
reception
Bit 1 Bit 0 Value (ms)
0 0 200
0 1 400
1 0 800
11Not used
These bits set the acceptable modem carrier drop
time.
Try using a longer setting if error code 0-22 is
frequent.
2 Reception carrier drop
operation.
0: Continue reception
1: Disconnect the line
This bit decides what the machine does when there
is a carrier drop in the image data.
3 Not used Do not change the setting.
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