Promax DEIDE Manual Del Usuario página 39

DEIDE EQUIPMENT. USER'S MANUAL
Figure 7.- Spectrum monitoring: TV channels.
The system allows three types of alarms to be defined for spectrum surveillance:
Level fluctuation, Signal loss and New signal apparition.
The variations are detected from fluctuations in the level of the signals. When a
fluctuation that surpasses certain magnitude and duration criteria is detected, the
equipment generates an alarm. This alarm remains registered in an incidents data
base, controlled by the same control program.
The criteria to decide upon the activation of an alarm can be varied from the control
program. They are established as a minimum difference related to the reference signal
and as a minimum duration of the fluctuation.
Alarm filtering
level
11/2005
ALARM:
6:30 PM
Emission:fa
Level: 60 dB V
f
a
Figure 8.- Signal comparison.
µ
Present Spectrum
Reference Spectrum
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