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CDM-Qx Satellite Modem
Front Panel Operation
Three redundancy modes are possible with a modem. Back-up devices are notated with a
B suffix. In a non-modem configuration, the back-up device must be installed in slot #4.
If a backup device has failed, the B suffix and the F suffix will alternately display.
1:1 redundant modems look similar to the two-modem example. The modems have
independent monitor functions, but configuring the prime modem will configure the
backup modem.
MD
In this example, the backup modem is selected.
1:2 and 1:3 modulators or demodulators look similar to the basic display. A backup
modulator or demodulator will back up all compatible modulators or demodulators in the
chassis designated as primes.
The Online LED together with the selection bracket (<>) is used to indicate which device
is online.
5.3.3
Spectrum Analyzer
The built-in spectrum analyzer mode is available, accessible via remote control, front
panel or web browser. When it is active, the selected demod will not respond to specific
Rx front panel settings, nor will it carry traffic. It is marked with an S suffix. It has it is
own front panel menu controls under the Test menu.
TX
<RX>
In this example, the bottom right receiver (as seen from the back of the chassis) is being
used as a spectrum analyzer. Only one Rx is allowed to enable spectrum analyzer in a
chassis. To view the spectrum, the user needs a Windows application from Comtech or a
web browser.
5.4
Right-Hand Display Area
Table 5-2 shows the menu structure, similar to the CDM-570L, and idenitifies the
paragraphs in this chapter which explain the features in greater detail.
The menus are shown fully populated, but if the addressed plug-in device is a modulator
or a demodulator, much of the menu tree will be locked out. Functions that are not tied to
a plug-in slot (like the external reference) are displayed no matter which slot is addressed.
<MDB> | (right hand display area)
| (right hand display area)
TX
| (right hand display area)
RXS
| (right hand display area)
5–5
Revision 6
MN/CDMQx.IOM
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