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QMultiFlex-400™ Installation and Operating Handbook
6.2.4.1 Network Topology
Table 6-1 shows the Network topology options.
Mesh
Mesh mode supports direct site-to-site communications. DVB-S2/S2X
inbound and outbounds are used as standard.
Star
Star mode supports hub and spoke communications. DVB-S2/S2X
inbound and outbounds are used as standard.
6.2.4.2 Tx Rate Control
Data rate
Symbol rate
6.2.4.3 Tx Data Rate
Range:
0.05 Mbps to 345.0 Mbps; step size: 0.000001Mbps (i.e. 1bps)
Description:
The terrestrial data rate is the maximum number of data bits that the
modem will process in relation to the IP interface.
The relationship between the terrestrial data rate and the size of the
satellite channel is complex. The modem will calculate and display the
channel symbol rate for the current configuration, or alternatively, for link
budget analysis, a comprehensive Rate Calculator is available from
Technical Support.
For IP, the terrestrial data rate must allow for all overhead due to IP
headers and ethernet frames and DVBS2 encapsulation frames.
The minimum and maximum data rate limits are determined by the
MODCOD selected. The modem will generally prevent invalid data rates
from being set and in the event that a limit is exceeded, then a
configuration warning will be generated.
As an alternative to setting the terrestrial data rate, the modem also
allows the satellite-link symbol rate to be set and will use this to determine
the terrestrial data rate.
Table 6-1 Network Topology
This allows the user to enter a data rate, from which a symbol rate
is calculated.
This allows the user to enter a symbol rate, from which a data rate
is calculated. With ACM enabled, only symbol rate is used.
Table 6-2 Tx Rate Control
Table 6-3 Tx Data Rate
6-12
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