Tektronix CTS 850, User Manual

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Setting Jitter/Wander Parameters
CTS850 SDH/PDH Test Set User Manual
3–165
10. When the Current BER equals the Recommended BER to within
an order of magnitude:
Press Menu
Button Select Menu
Page Highlight
Parameter
Select Choice
TEST SETUPS JITTER TESTS Record Error
Threshold Record BER
11. Increase the receive level by 1.0 dB (that is, reduce the
attenuation by 1.0 dB).
12. Press the START/STOP button to run the jitter test. The results
are displayed on screen in numerical and graphical form. This
takes about 6 minutes for 6 points.
Transfer Jitter Test.
Follow these additional steps to set up a jitter
transfer test.
1. Set Test Type to Jitter Transfer. Set the mask type as follows:
Press Menu
Button Select Menu
Page Highlight
Parameter
Select Choice
TEST SETUPS JITTER TESTS Mask Type as appropriate
The available mask types are dependent on the current transmit rate.
The CTS850 modulates the transmitted line with sinusoidal jitter. If
the TX menu sets Jitter Output to Clock, the Jitter Transfer screen
will indicate “Unsupported Settings”. The jitter generator begins at
the start frequency and stops at the end frequency.
2. The available start frequencies are dependant on the current
transmit rate. To set the start frequency for the jitter generator:
Press Menu
Button Select Menu
Page Highlight
Parameter
Select Choice
TEST SETUPS JITTER TESTS Start Frequency as appropriate