Tektronix CTS 850, User Manual

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Basic Test Procedures
3–24
CTS850 SDH/PDH Test Set User Manual
Onset-of-Errors Method.
The onset-of-errors method measures the
error output of a network element when jitter is applied to its input.
If there are two or more Errored Seconds in a 30-second time
interval, then the CTS850 plots the jitter frequency and amplitude on
a graph and compares it to a mask you can choose.
1. Connect the CTS850 to the network element as shown in
Figure 3–8.
NE
These two
signals are
STM–1E
CTS 850 SDH/PDH Test Set
Figure 3–8: Setup to Check Onset-of-Errors Jitter Tolerance
2. Set the transmit and receive signals to STM-1E.