Gestetner B147, Руководство по обслуживанию

Страница: 858 / 1081

BIT SWITCHES
B603 64 SM
G3-1 Switch 09 SP No. 1-105-010
No FUNCTION COMMENTS
2
to
3
ISDN cable equalizer
(rx mode: Internal)
Bit 3 Bit 2 Setting
0 0 None
0 1 Low
1 0 Medium
1 1 High
(Japan Only)
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 ISDN cable equalizer
(V.8/V.17 rx mode: External)
0 : Disabled
1 : Enabled (Japan Only)
Keep this bit at “0” in most cases.
5 ISDN cable equalizer
(V.34 rx mode: External)
0 : Disabled
1 : Enabled (Japan Only)
Keep this bit at “0” in most cases.
6-7 Not used Do not change the settings.
G3-1 Switch 0A SP No. 1-105-011
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
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 the settings.
4 Maximum allowable frame
interval during image data
reception.
0: 5 s 1: 13 s
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.
5 Not used Do not change the setting.
6 Reconstruction time for the first
line in receive mode
0: 6 s 1: 12 s
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.
7 Not used Do not change the setting.