This optional menu provides the following jitter processing functions:
Jitter measurements
: Measurements and analysis of jitter in received signal.
Maximum Tolerable Jitter
: Measure maximum tolerable jitter (MTJ) according to ITU-T G.823 recommendation.
Jitter transfer function
: Measure JTF characteristic.
Jitter generation
: Generate harmonic jitter of user-defined level and frequency.
Jitter measurements
The Jitter measurements submenu allows the user to measure and analyze received signal jitter. The
measurements example is shown at Figure
5.23
(the vertical grid spacing is 0.5 UIpp).
Press ‘F1’ to start measurements.
Press ‘F2’ to reset the screen.
To select the HP1+LP (20 Hz… 100 kHz) or HP2+LP (18 kHz...100 kHz) filter, press ‘F4.’
Maximum Tolerable Jitter
This menu allows user to measure and analyze the MTJ characteristic (ITU-T G.823) for a tested path.
Required measurement criteria:
1.
Occurrence of the synchronization with PRBS (no LSS alarm signal).
2.
Make sure the essential jitter is inserted into transmitted data stream. All currently performed
measurements should be stopped or paused.
The measurements result is an MTJ characteristic diagram. Horizontal axis corresponds to frequencies range of
20Hz... 100kHz; vertical axis– to generated jitter amplitude.
Figure 5.22:
“Jitter Measurements” submenu
Figure 5.23:
Maximum Tolerable Jitter
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TX50e e-Manual D07-00-009 REVA00
