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Making Measurements
Measuring Jitter Tolerance
Measuring Jitter Tolerance
Description: The jitter auto tolerance feature provides jitter tolerance measurements
within the relevant ITU-T mask, G.823 for DSn, G.958, G.825 and
Bellcore GR-253 for SONET.
Jitter is generated at a range of frequencies within the mask and an
error measurement is made. If no errors occur (PASS), the jitter
amplitude at that frequency point is increased until errors occur (FAIL)
or the maximum jitter amplitude is reached. The highest jitter
amplitude at which PASS occurs is plotted on the graph as the Jitter
Tolerance for that jitter frequency.
TIP: The transmitter and receiver can be set to different rates to allow testing
across multiplexers, for example transmitter set to STS-3 with embedded
DS-3 and receiver set to DS-3.
HOW TO: Make the Measurement
1 If you are performing jitter tolerance on the DSn signal, set up the DSn
transmit and receive interfaces. See “Setting DSn Transmit Interface”
page 2 and “Setting DSn Receive Interface” page 15.