Gestetner B147, Service Manual

Page: 878 / 1081

DEDICATED TRANSMISSION PARAMETERS
B603 84 SM
3.4.2 PARAMETERS
The initial settings of the following parameters are all FF(H) - all the parameters are
disabled.
Switch 00
FUNCTION AND COMMENTS
ITU-T T1 time (for PSTN G3 mode)
If the connection time to a particular terminal is longer than the NCU parameter setting,
adjust this byte. The T1 time is the value stored in this byte (in hex code), multiplied by 1
second.
Range:
0 to 120 s (00h to 78h)
FFh - The local NCU parameter factory setting is used.
Do not program a value between 79h and FEh.
Switch 01
No FUNCTION COMMENTS
0
to
4
Tx level
Bit 4 3 2 1 0 Setting
0 0 0 0 0 0
0 0 0 0 1 -1
0 0 0 1 0 -2
0 0 0 1 1 -3
0 0 1 0 0 -4
:
:
0 1 1 1 1 -15
1 1 1 1 1 Disabled
If communication with a particular remote terminal
often contains errors, the signal level may be
inappropriate. Adjust the Tx level for
communications with that terminal until the results
are better.
If the setting is “Disabled”, the NCU parameter 01
setting is used.
Note: Do not use settings other than listed on the
left.
5
to
7
Cable equalizer
Bit 7 6 5 Setting
0 0 0 None
0 0 1 Low
0 1 0 Medium
0 1 1 High
1 1 1 Disabled
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 when
calling the number stored in this Quick/Speed Dial.
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: Do not use settings other than listed on the
left.
If the setting is “Disabled”, the bit switch setting is
used.