Comtech EF Data CDM-Qx, Инструкция по установке и эксплуатации

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CDM-Qx Satellite Modem Revision 6
Front Panel Operation MN/CDMQx.IOM
5.7.2.2 (Monitor
%
Rx-Params) – RECEIVE-PARAMETERS
Selecting
Rx-Params
displays the following submenu:
EbNo=05.7dB BER=3.4E-9
*
F=+11.7k Buf=50% RSL=-24dBm
If the demodulator is locked, the following information appears on this screen:
Eb/No
This shows the value of Eb/No calculated by the demodulator. The value referred to
here is the energy per information bit (Ebi), divided by the noise spectral density (No).
BER This is an estimate of the corrected BER.
*
F The frequency offset of the received carrier, in kHz, with a displayed resolution of 100 Hz.
Buf
(Buffer fill state) This shows the fill state (in percent), of the receive Buffer. After a
reset, it will read 50. A value <50 indicates that the buffer is emptying, and >50
indicates that it is filling.
RSL
(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 display RSL <-99
If the demodulator is
not
locked, this screen shows the message ‘ Demodulator:
Not Locked
’, but continues to display the receive signal level. Pressing
ENTER
or
CLEAR
takes the user back to the previous menu:
Demodulator: Not Locked
*
F=+11.7k RSL=-24dBm
5.7.2.3 (Monitor
%
Event-Log) – EVENT-LOG or STORED EVENTS
Selecting
Event-Log
displays the following submenu:
Stored Events:
View Clear-All ( ◄ ► , ENT)
Select
View
or
Clear-All
using the
◄ ►
arrow keys, then press
ENTER
.
Selecting
View
displays the following screen:
Log 023: 30/11/02 10:37:32
Fault - Demod Lock (3) (
▲ ▼ , ENT)
In this example, the demodulator installed in slot #3 is faulted on Nov. 30, 2002 at
10:37:32 with log number 23.
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