Q-Lite Satellite Modem Installation and Operating Handbook
6-5
Figure 6-4 Modem Summary Status
Summary status information for the modem is shown at the top left-hand side of the
screen as shown in
Figure 6-4
. This presents the following:
•
‘ID’: The user-entered modem-identification text string.
•
‘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.
The
Status
screen contains the current modem status split over several screens as
described in the following sections.
6.2.2.1 Status Setup
The
Setup
section of the
Status
screen is continually updated with the following
information:
•
Transmit and receive carrier frequencies.
•
Transmit and receive terrestrial data rates.
•
Transmit and receive symbol rates.
In addition, the following are shown:
•
Transmit carrier bandwidth at the -3dB point.
•
Transmit carrier bandwidth at the -30dB point
.
These 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.
