User`s guide

Glossary of Terms
+/- 0.5 UI Filter - Available when a pattern marker is being used and Quick-mode is not enabled. Eliminates stray errors
due to insertion of extra IDLE characters compensating for device re-clocking that disrupts standard Fibre Channel
test patterns. Filters are automatically calculated and applied to throw away any measurements that are more then +/-
0.5 UI away from their expected positions. If more than 5% of the edges are filtered, an error will be reported.
# of Averages - Selects the number of averages for each sampled point displayed on the screen.
1, 2, 3, 4 command (Tool menu) - Use the numbers and filenames listed at the bottom of the Tool menu to open the last
four tools used. Choose the number/name that corresponds with the tool to re-open.
1-sigma - The standard deviation of jitter. For a pure Gaussian distribution, the standard deviation value is 1/14 of the
peak-to-peak value for BER 10
-12
.
1-sigma Arm Violation - An example of an arm violation of the 1-sigma plot looks like the figure below. As the 1-
sigma plot is being generated, one of the histograms actually has 2 histograms (see Clock Histogram Arm
Violation). Thus, the 1-sigma value is very large and you get the spikes shown.
About command (Help menu) - Click on this command to display the copyright notice and version number of your
copy of GigiView software.
Acquire Electrical Idle Values - When this button is pressed, the signal being transmitted to the SIA-3000 must be
the Electrical Idle state of a transmitter. The SIA-3000 will then measure the parts of the common mode
measurements in the PCI Express specifications that are required to be performed in the electrical idle state. In
the Electrical Idle State, both differential lines of a PCI Express link are driven to their common mode level.
Acquire Time (s) - Changes the amount of time data is acquired while in each histogram window. A setting of 10
seconds would change the data acquisition for the right and left histogram to 10 seconds each. A larger Acquire
Time generally reduces the overall test time because the acquire time is the time in which data is obtained for the
TailFit process. A larger Acquire Time increases the percentage of time used for the TailFit process.
Active check box - Checking this box will activate the highlighted Optical Input line.
© WAVECREST Corporation 2005 Glossary
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