Press ‘F1’ to start/stop the measurement.
Colors on the graphical diagram denote the following:
White
: White line displays the MTJ mask according to ITU-T G.823 recommendation.
Green
: Range of jitter values which are valid for tested path.
Red
: Range of jitter values which are not valid for tested path.
Magenta
: Range of values which are not available for generating.
Jitter Transfer Function
To analyze JTF characteristic, relevant to MTJ mask jitter (see ITU-T G.823 recommendation, Figure G.823/13) is
inserted into a specified channel and, then the received signal jitter value is measured.
JTF calculation formula:
It is necessary to perform a calibration to increase the results accuracy.
The calibration must be performed in following cases:
z
Changing the test pattern type.
z
Changing the type of frame structure (PCM-30, PCM-31, unstructured data flow).
Calibration result is shown at figure below.
Jitter generation
The Jitter generation submenu provides the ability to insert a harmonic jitter of user-defined frequency and peak-
to-peak amplitude into a signal transmitted by the analyzer.
In case of jitter generation, the “Sync” parameter in the “Line interface” menu must be set to “Intr” value.
Following functional buttons are used to configure jitter parameters:
z
Reduce current value
z
Increase current value
Figure 5.24:
JTF calibration result
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TX50e e-Manual D07-00-009 REVA00
