
ArcLight Hub User’s Guide
Screen Descriptions for NMS Client
Rev. 001
1081006
3-81
multicast address at each Hub for that one Forward Link will be
239.239.239.0.
Profile Type:
Click radio button for appropriate profile: DSSS or
DVBS2
Symbol Rate (Msps):
This value is the modulated symbol rate sent on
the link. It has a range of 0.10 to 53.99 MSPS.
Roll-off:
Select roll-off type from pull down menu. The roll-off factor
can be 0.35, 0.25, or 0.20 as defined by ETSI EN 302 307 v1.1.1 (2004-
01).
ACM/VCM Mode:
Click on On or Off radio button to activate
ACM/VCM mode.
Clock Reference:
Select clock reference from pull down menu. This
selection determines whether the External Reference input, the internal
reference clock, or the ASI receive clock is used as the reference for
generating output symbol rate.
Ref. Output Level (dBm):
This is the transmitted output level in dBm.
It has a valid range of 0dBm to –31.5dBm in 0.5 dB steps.
Pilot Tones Enabled:
Click check box to enable pilot tones. This is
used for pilot or non-pilot mode. If it is enabled, then there are pilot
tones inserted in the frame. If it is disabled (check box unchecked)
then no pilot tones are inserted.
MODCODES
Code rate Identifier:
This area is used to select code rates from the
pull down menu. Available code rates are shown in the table below:
Table 3-4. Code Rate Table.
Code Rate
Field Value
ONE_FOURTH 9
ONE_THIRD 10
TWO_FIFTHS 0
ONE_HALF 1
THREE_FIFTHS 2
TWO_THIRDS 3
THREE_FOURTHS 4
FOUR_FIFTHS 5
FIVE_SIXTHS 6
EIGHT_NINTHS 7
NINE_TENTHS 8
Modulation:
Select QPSK, 8PSK or 16APSK from pull down menu.
Blocksize:
Select a blocksize from pull down menu.
OK
– Click on this button to close the screen.
Cancel
– Click on this button to erase any new entries made on the
open screen, close the current screen and revert to the next higher-level
screen in the hierarchy. The next time the screen is opened the values
that existed before the current editing session will appear. The Cancel
button will not undo use of the OK or Apply buttons.
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