VeEX VePAL TX300M, User Manual

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13.0 Jitter and Wander
Accessing Jitter and Wander
On the TX300, go to
OTN/SDH/SONET Testing
from the
Test Mode Selection
, then select the following:
For
PDH
or
DS3/1 signals
: Home (Main Menu) > Advanced Mode > PDH or DS3/1 Tools > (DS1/3) Jitter & Wander
For
SONET
or
SDH signals
: Home (Main Menu) > Advanced Mode > SONET/SDH Tools > More > Jitter & Wander
On the TX300e, go to
OTN/SDH/SONET Testing
from the
Test Mode Selection
, then select the following:
For
PDH
or
DS3/1 signals
: Home (Main Menu) > PDH or DS3/1 Tools > (DS1/3) Jitter & Wander
For
SONET
or
SDH signals
: Home (Main Menu) > SONET/SDH Tools > More > Jitter & Wander
Jitter & Wander displays the Jitter Measurements showing measurements and analysis of jitter in received signal.
Jitter and Wander (PDH E3 Menu - TX300)
Jitter and Wander are usually described as the phase noise in digital signals. This is a natural occurrence in telecommunication networks.
Excessive jitter can lead to transmission errors and deterioration in network quality. ITU defines jitter as follows: "The short-term variations of the significant
instances of a digital signal from their ideal positions in time (where short-term implies these variations are of frequency greater than or equal to 10 Hz)." The
long-term variation (less than 10 Hz) of a digital signal is called wander.
In simple terms, jitter is an unwanted phase modulation of the digital signal that may cause errors or bit slips in a digital circuit and deteriorate the performance of
a transmission network.
In lower-rate digital systems, systematic jitter is dominant. In higher-rate systems, random jitter may become more important. Test environment parameters that
affect jitter performance are test sequences, bit rate, pulse shape, cable characteristics, temperature, cross-talk, and noise.
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13.1 Jitter Measurement & Generation (Jitter icon)
Tapping the Jitter icon brings up the
Jitter Measurement and Generation
screen.
Jitter Measurement and Generation Menu
TX300S_e-manual_D07-00-064P_RevA00