Odu; Monitor: Rx-Params; Monitor: Event-Log - Comtech EF Data CDM-Qx Installation And Operation Manual

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier®
Front Panel Operation
5.5.1.4 MONITOR: Alarms
This feature is operable only for CDM-QxL L-Band units.
IMPORTANT
ODU Alarms: None
This read-only screen indicates if there are any ODU Alarms. If not, it displays 'None'. Press
to return to the previous menu.
ENTER
5.5.2

MONITOR: Rx-Params

EbNo=05.7dB
F=+11.7k Buf=50% RSL=-24dBm
When the demodulator is locked, information appears on the Rx-Params screen as shown in the
above example. Note the following:
This shows the value of Eb/No calculated by the demodulator. The value referred to here is
Eb/No
the energy per information bit (Ebi), divided by the noise spectral density (No).
This is an estimate of the corrected BER.
BER
This is the frequency offset of the received carrier, in kHz, with a displayed resolution of 100
F
Hz.
(Buffer fill state) This shows the fill state, in percent, of the receive Buffer. After a reset, it will
Buf
read 50. A value <50 indicates that the buffer is emptying, and >50 indicates that it is filling.
(Receive Signal Level) A value in dBm, indicating the input power of the desired carrier, as
seen by the demodulator. If the signal level is below the AGC range of the demod, this will
RSL
display RSL <-99.
When the demodulator is not locked, the following information appears on the Rx-Params screen:
Demodulator: Not Locked
F=+11.7k
As per this second example, this screen shows the message 'Demodulator: Not Locked'
but continues to display the receive signal level. Press
previous menu.
5.5.3

MONITOR: Event-Log

Stored Events:
View
Select View or Clear-All using the ◄ ► arrow keys, then press

ODU

BER=3.4E-9
RSL=-24dBm
Clear-All
(ENT)
ENTER
(◄ ►,ENT)
5–44
MN/CDMQX.IOM
or to return to the
CLEAR
.
ENTER
Revision 7