Promax PROLITE-75 Mode D'emploi page 58

The screen shows (Figure 8.-) the loss or gain of the power in dB units, for each
of the wavelengths, in the form of a horizontal bar graph and in numerical format.
The central point "0" of the graph represents the reference level acquired. From
this reference level, the signal power can grow or decrease. Typically, in a signal that
goes to the OLT (Downstream: 1490/1550) losses may grow, but when goes to the
ONT (Upstream: 1310) may decrease as it approaches to the emission center.
The bar graph can represent gain/losses up to ± 40 dB with regard to the
reference level. The end of each bar graph will show an arrow when exceeding this
value. In numeric format will show the real value.
At the bottom of the screen, softkeys provide access to the next options:
METER [F1]:
ONT [F2]:
REFERENCE [F3]:
THRESHOLD [F4]:
LOGGER [F5]:
4.2.2.2 ONT function
The function ONT TIME ANALYSER performs the characterization of a ONT
signal. In this way, allows displaying the pulses activity of the Upstream signal
(1310 nm) over time. Also allows time scale to be change (resolution). This analyser is
specially designed to catch BURST signals, that is, when it is sent a lot of information in
a very short time.
To access the ONT function:
1.- From the GPON METER function press the softkey ONT [F2].
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Pressing this softkey returns to the GPON METER
function (see paragraph 4.2.2).
Pressing this softkey you will get into the function to
measure Upstream signal over time (see paragraph
4.2.2.2).
This function allows you to enter the reference values
for measuring LOSSES (see paragraph 4.2.2.3).
Using this function you can define and save some
threshold values in groups. Later they can be used for a
measurement (see paragraph 4.2.2.4).
Pressing this key you can save measures taken at the
time (see paragraph 4.2.2.5).
USER'S MANUAL. PROLITE-75
04-2009