Newtec MDM9000 - Page 296

Newtec Proprietary
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Feature Descriptions
MDM9000 Satellite Modem
Monitoring
Parameter Description
State
The state of the bandwidth cancellation function can be in one of the
following states:
• Off, in case bandwidth cancellation is disabled.
• Searching, when in the process of acquiring lock.
• Locked when the cancellation function is fully operational.
Round Trip Delay The measured round trip delay the carrier (that is uplinked and again
received) experiences.
Use this value to fine tune the control parameter "Expected round trip
delay". The round trip delay can slightly change due to Doppler and the
satellite moving in its "box".
Local to Total Carrier
Power Ratio
The measured ratio between the total received power at the input of the
modem and the received local carrier power.
Local to Remote
Carrier Power Ratio
The measured ratio between the remote carrier power and the received
local carrier power.
Local Carrier Level The power of the received local carrier (that is uplinked then received)
prior to actual cancellation.
Local Carrier
Tracked Symbol rate
The measured symbol rate of the local carrier (that is uplink, received
and canceled out).
Local Carrier
Frequency Offset
The difference between the set local carrier carrier frequency and the
actual detected local carrier frequency.
Local Carrier
Spectral Inversion
The spectral inversion of the local carrier (that is uplinked and again
received) that is applied. This can be either have been set manually or
detected automatically (by using the "automatic" setting in the "Local
carrier spectral inversion" control parameter. Once the spectral inversion
is know it is advised to set it manual to the correct value in order to
reduced cancellation lock time.
In case traffic is not sufficient random a periodic demodulator lock loss might occur.
In such case one should configure a physical layer scrambling signature both on the
modulator as well as on the demodulator with an identical non-zero value.
See section: PhysicalLayerScramblingonpage174.