Gestetner B003 Service Manual page 703

BIT SWITCHES
2 ISDN cable equalizer
to (rx mode: Internal)
3 Bit 3 Bit 2
0 0
0 1
1 0
1 1
4 ISDN cable equalizer
(V.8/V.17 rx mode: External)
0: Disabled
1: Enabled
5 ISDN cable equalizer
(V.34 rx mode: External)
0: Disabled
1: Enabled
6-7 Not used
G3 Switch 0A
No FUNCTION
0 Maximum allowable carrier
drop during image data
1
reception
Bit 1 Bit 0
0 0
0 1
1 0
1 1
2-3 Not used
4 Maximum allowable frame
interval during image data
reception.
0: 5 s 1: 13 s
5 Not used
6 Reconstruction time for the first
line in receive mode
0: 6 s 1: 12 s
7 Not used
B003/B004/B006/B007
Use a higher setting if there is signal loss at higher
frequencies because of the length of wire between
Setting the modem and the telephone exchange.
None
Low
Also, try using the cable equalizer if one or more of
Medium
the following symptoms occurs.
High
• Communication error with error codes such as
• Modem rate fallback occurs frequently.
Note: This setting is not effective in V.34
communications.
Keep this bit at "0" in most cases.
Keep this bit at "0" in most cases.
Do not change the settings.
These bits set the acceptable modem carrier drop
time.
Try using a longer setting if error code 0-22 is
Value (ms) frequent.
200
400
800
Not used
Do not change the settings.
This bit set the maximum interval between EOL
(end-of-line) signals and the maximum interval
between ECM frames from the other end.
Try using a longer setting if error code 0-21 is
frequent.
Do not change the setting.
When the sending terminal is controlled by a
computer, there may be a delay in receiving page
data after the local machine accepts set-up data and
sends CFR. This is outside the T.30
recommendation. But, if this delay occurs, set this
bit to 1 to give the sending machine more time to
send data.
Refer to error code 0-20.
ITU-T T.30 recommendation: The first line should
come within 5 s of CFR.
Do not change the setting.
0-20, 0-23, etc.
COMMENTS
3-46
SP No. 1-105-011
SM