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CDM-625A Advanced Satellite Modem
Front Panel Operation
Stats 116: 22.0,22.0,37,37,21.9,21,6
17/11/14 11:18:44
The modem calculates and then displays, on the top line from left to right, statistics data as
follows:
•
(22.0,22.0) First, the SNR is calculated: The minimum SNR value observed in the
measurement interval is provided first, and then the average SNR observed value follows.
The screen dislays 16.0 only if the measured values are ≥16.0 dB.
•
(37) Maximum Rx ModCod, in decimal format, during the measurement interval.
•
(37) Minimum Rx ModCod, in decimal format, during the measurement interval.
•
( 22.6, 22.4) (21.6,21.6) Finally, the Receive Signal Level (RSL) is calculated (note that both
values are negative): The minimum value observed in the measurement interval is provided
first, and then the average RSL observed value follows.
6.2.3.5
Monitor: Rx Parameters
Rx-Parameters: EbNo=11.4dB
BER=0.0E-9
When in IP-ACM or V2-ACM mode:
Rx-Parameters: SNR=11.4dB
BER=0.0E-9
If the demodulator is locked, then this screen displays the following:
Item
Description
This shows the value of Eb/No calculated by the demodulator. The value referred to here is the
Eb/No
energy per information bit (Ebi), divided by the noise spectral density (No).
(This item replaces "Eb/No" when IP-ACM or V2-ACM mode is active) In ACM, SNR is the preferred
SNR
metric. Remember that
The frequency offset of the received carrier, in kHz, in increments of 100 Hz.
∆F
BER
This is an estimate of the corrected BER.
(Buffer fill state) This shows the fill state (in percent), of the receive Buffer. After a reset, it will read
Buffer
50. A value <50% indicates that the buffer is emptying, and >50% indicates that it is filling.
Rx-Level
A dBm reading indicating the signal level of the desired receive carrier in increments of 0.5 dB
Clear-All: No
Buffer=51%
RxLevel=-43.5dBm
Buffer=51%
RxLevel=-43.5dBm
SNR = Eb/No + 10
log
6–84
(N/Y)
∆F=+011.7kHz
∆F=+011.7kHz
(spectral efficiency)
MN-CDM625A
Revision 4
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