UHP SCPC MODEM
USER MANUAL, v3.2
© ROMANTIS 2015
41
www.uhp.net
7.5
Example of SCPC – Fault Fixing
Figure 44 UHP demodulator statistics and configuration
To monitor the status of the SCPC channel the following should be performed on the router:
Check the demodulator status – choose DEM1 in Statistics area;
Check the modulator status – choose MOD in Statistics area;
7.5.1
Monitoring Demodulator Status
Based on UHP demodulator statistics and configuration (see Figure 44), assess whether the router receives the
data from the Outroute as well as the quality of the communication channel.
Parameters needed to evaluate the quality of the received communication channel:
Demodulator interface is UP - demodulator receives a signal from the satellite;
InLvl - receive signal level. The higher the value - the more stable the receive signal is;
The level of -80 ...- 70 means that the modem cable is connected to LNB and powered on.
The NoSig setting value means no signal in the input path.
C/N – carrier/noise ratio. This value should match nominal C/N values for used MODCOD
(modu FEC). See UHP Specifications;
Packets and Rate / bps - These counters allow estimating presence of traffic at the demodulator
input;
CRC_errors - This counts errors at the modulator output. At low InLvl or low C/N values the error
counter will increase; the intensity of error increase depends on InLvl and C/N levels.
If demodulator’s status is Down (see Figure 45) the following should be performed:
1.
Verify the physical connection between RF units, cable and router;
2.
Ensure correct pointing of the antenna to the satellite;
3.
Check the demodulator settings. If necessary adjust the settings in accordance with the values
specified by satellite operator.
