2-19
Application Tutorials
Tutorial 6: Test to Industry Standards
Tutorial 6: Test to Industry Standards Masks allow you to test eye-diagrams against industry standards. The eye-dia-
gram analyzer provides built-in masks for testing the ma jo r SONET/SDH
transmission rates. Compatible modes are eye and eyeline. Shown in this tuto-
rial is the ability to:
•Count mask errors
•Allow for specified amount of margin testing
•Stop after a specified number of trace errors
•Show the violation trace (eyeline mode only)
Select the Mask
1Set the analyzer to a known state by pressing:
INSTR PRESET
2You can use your own hardware filter during this tutorial, or load a software
filter as described in the previous tutori al.
3Set the bit interval and delay by pressing:
Setup, BIT INTVL and enter 1.5, DELAY
Adjust the delay to center the eye.
4Select a mask by pressing:
Masks, mask setup, default masks, STM-16 OC-48
The display shows an unscaled rectangle mask.
5Align the mask by pressing:
MASK ALIGN
Wait for the displayed # samp count to reach 100%.
This step aligns the mask to the data using automatic scaling. Noti c e that, for
the purposes of clarity, the graticule is turned off. This was done using the
70820A Config menu.