BIT SWITCHES
21 May, 1999
4-40
G3 Switch 08 - Not used (do not change any of these settings)
G3 Switch 09
No
FUNCTION
COMMENTS
0
1
ISDN cable equalizer
(tx mode)
Bit 1
Bit 0
Setting
0
0
None
0
1
Low
1
0
Medium
1
1
High
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.
2
3
ISDN cable equalizer
(rx mode)
Bit 3
Bit 2
Setting
0
0
None
0
1
Low
1
0
Medium
1
1
High
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.
4
ISDN external equalizer for
V.27ter, V.29, V.33/V.17, V.8
(Rx mode)
0: Disabled 1: Enabled
1: Keep this bit at “1” in most cases.
5
ISDN external equalizer for
V.34
(Rx mode)
0: Disabled 1: Enabled
1: Keep this bit at “1” in most cases.
6-7
Not used
Do not change the settings.
G3 Switch 0A
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
1 1 Not used
These bits set the acceptable modem carrier
drop time.
Try using a longer setting if error code 0-22 is
frequent.
2-3
Not used
Do not change these settings.
