28
ATT: Attenuation
To change the attenuation setting of the selected converter:
•
Press the left or right arrow key to select the attenuation field on the display.
•
Use the numeric data entry keys to enter a specific attenuation value. The up and
down arrow keys can be used to increment or decrement the attenuation
dynamically.
•
If the numeric data entry keys were used, press “ENTER” to set the displayed
attenuation.
•
If the NSU-Converter Serial Link is enabled for the selected converter the NSU will
attempt to set the selected converter to the desired attenuation. If the NSU cannot
set the converter to the new attenuation an error tone is generated and the entry
will be revoked.
SLP: Backup Converter Slope
The Backup Converter Slope settings are only relevant when the backup converter is
equipped with a programmable slope adjustment. In the case where the Backup
Converter is not equipped with slope control, the slope settings are not displayed. The
operator can store slope settings for each path that the backup converter may occupy.
The slope setting of the Primary Converter has no bearing on the NSU operations and
cannot be accessed from this screen. For example, when the backup converter is online
in place of a Primary Converter the Backup Converter will be set to the Backup
Converter Slope stored in the NSU for that chain position regardless of the slope setting
of the Primary Converter. To adjust the Backup Converter Slope for the selected chain
position:
•
Press the left or right arrow key to select the slope field on the display.
•
Use the numeric data entry keys to enter a specific slope value or use the up and
down arrow keys to increment or decrement the displayed slope.
•
If the numeric data entry keys were used, press “ENTER” to set the displayed
slope. NOTE: Once an entry has been initiated using the numeric keys, the up
and down arrow keys can be used to toggle the sign.
•
If the NSU-Converter Serial Link is enabled for the Backup Converter and the
Backup Converter in online in the selected chain position the NSU will attempt to
set the Backup Converter to the slope displayed. If the NSU cannot set the
Backup Converter to the new slope an error tone is generated and the entry will be
revoked.
EQ: Gain Equalization
In the case of a redundant switchover, the attenuation applied by the Backup Unit
becomes equal to the attenuation setting of the Primary Unit added to the signed value
of the Gain Equalization setting. This provides for compensation of the difference in
cable losses. The calculated attenuation will be bounded by a 0.0 dB minimum and 30.0
dB maximum, moving in 0.2 dB steps.
To change the Gain Equalization setting for a redundancy chain position:
•
Press the left or right arrow key to select the gain equalization field on the display.
•
Use the numeric data entry keys to enter the desired gain equalization or the up
and down arrow keys to increment or decrement the gain equalization. NOTE:
Once an entry has been initiated using the numeric keys, the up and down arrow
keys can be used to toggle the sign.
•
Press “ENTER” to set the displayed equalization.
•
If the NSU-Converter Serial Link is enabled for the Backup Converter and the
Backup Converter in online in the selected chain position the NSU will attempt to
set the Backup Converter to the calculated attenuation. If the NSU cannot set the
Backup Converter to the new attenuation an error tone is generated and the entry
will be revoked.