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QMultiFlex-400™ Installation and Operating Handbook
Summary status information for the modem is shown at the top left-hand side of the screen
as shown in Figure 6-5. This presents the following:
•
'ID': The user-entered modem-identification text string – default is 'QMultiFlex-
400™'
•
'Serial No.': The modem serial number.
•
'Mode': This will show either 'In control' when the web user has full control over the
modem or 'View only' when the web user is restricted to viewing modem information
but cannot change the modem's configuration (i.e. the modem is set to Local mode).
The Status screen contains the current modem status as described in the following
sections.
6.2.2.1 Setup
The Setup section of the Status Summary page (right-hand side of Figure 6-4) shows the
following information:
•
Transmit carrier frequency.
•
Transmit terrestrial data rate.
•
Transmit symbol rate.
•
Transmit carrier bandwidth at the -3dB point.
•
Transmit carrier bandwidth at the -30dB point.
•
The number of demodulators that have been enabled.
•
The total symbol rate of the demodulator carriers
The carrier bandwidth values are useful for performing bandwidth comparisons between
different modem configurations, including the use of different spectral roll-off factors. The
carrier does not contain any useful information below the -3dB point. There are various
definitions of occupied and allocated bandwidth and therefore the -30dB point is used in
order to provide an unambiguous reference point. When determining the bandwidth of the
carrier, various cut-off points are used by satellite operators, with -30dB being the worst
case. Satellite operators will also add a guard band that further increases the overall
bandwidth requirements.
Figure 6-5 Unit Summary Status
6-6
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