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CDM-Qx Satellite Modem Revision 5
Front Panel Operation MN/CDMQx.IOM
5–2
On most menu screens, the user will observe a flashing solid block cursor, which blinks
at a once-per-second rate. This indicates the currently selected item, digit, or field. Where
this solid block cursor would obscure the item being edited (for example, a numeric field)
the cursor will automatically change to an underline cursor.
If the user were to display the same screen for weeks at a time, the display could become
‘burnt’ with this image. To prevent this, the unit has a ‘screen saver’ feature that will
activate after 1 hour. The top line of the display will show the Circuit ID (which can be
entered by the user) and the bottom line will show the circuit Eb/No value (if there is a
demod and it is locked) followed by ‘Press any key....’. The message moves from right to
left across the screen, then wraps around. If there are multiple circuits, their messages and
Eb/No’s will be displayed sequentially. Pressing any key will restore the previous screen.
The behavior of the front panel LEDs is described below in Table 5-1.
Table 5-1. Front Panel LED Indicators
LED Color Condition
Red A Unit Fault exists (Example: PSU fault)
Green No Unit Faults
Unit
Status
Note: Unit fault does not include Tx or Rx fault.
Green No Tx Traffic Faults
Off A Tx Traffic fault exists or the Tx Carrier is in OFF state
Transmit
Traffic
Note: This LED corresponds to the selected slot, example <TX>.
Green No Rx Traffic Faults (demod and Viterbi decoder are locked, everything is OK)
Off
An Rx Traffic fault exists (the demod may still be OK – check the fault status of the
unit from the Monitor menu).
Receive
Traffic
Note: This LED corresponds to the selected slot, example <RX>.
Green The Unit is On Line, and carrying traffic
Off
The Unit is Off Line (standby) - forced by externally connected 1:1 or 1:N
redundancy system
Online
Note: This LED corresponds to the selected slot, example <RX>.
Orange
There is a Stored Event in the log, which can be viewed from the front panel, or
retrieved via the remote control interface
Stored Event
Off There are no Stored Events
Orange The Unit is in Remote Mode - local monitoring is possible, but no local control
Off The Unit is in Local Mode - remote monitoring is possible, but no remote control
Remote
Flashing ODU FSK control has been enabled, and there is a communications fault.
Orange
Framing on, EDMAC on, and unit defined as Slave - local monitoring is possible,
but no local control
EDMAC Mode
Off
Either the unit is in Transparent mode (no framing), or the framing has been
selected, but in AUPC-only mode, or EDMAC Master configuration.
Orange
A Test Mode is selected (example: IF Loopback), or BERT Generator is turned on,
or BERT Monitor is turned on, or Spectrum Analyzer is turned on.
Test Mode
Off
There is no Test Mode currently selected, BERT Generator is off, BERT Monitor is
off, and spectrum Analyzer is off.
IMPORTANT
In general, the Alarm relay state will reflect the state of the Front Panel LEDs. For instance, if
the Unit Status LED is red, the Unit Alarm relay will be active, etc. The one exception is the
Transmit Traffic relay. This will only be activated if a Transmit Traffic Fault exists – it does not
reflect the state of the TX carrier.