User guide

How to Demonstrate the Error Location Capture Measurement
To demonstrate the Error Location Capture measurement:
1
Switch to the Pattern panel and press the Open button. Load a Fiber Channel
random data pattern from the demo patterns
(Demo > Fiber Channel > RPAT.ptrn) .
Press the Properties button and set the Pattern Type to Alternate. To display
both halves of the alternate pattern, press the Alt pat view button.
Ensure also that the error detector tracks the pattern generator.
2
Insert two errors into pattern B. To do so, edit bits 80 and 100 of pattern B in
overwrite mode.
3
Write the modified pattern to the pattern generator and the error detector by
pressing the ToPG&ED button.
4
For the pattern generator setup you need to specify the Alternate Pattern and
Aux In. Set the Internal Alternate Pattern Mode to Single Shot B and disable
Aux In.
5
Set up the error detector so that the Clock Setup is set to Clock Data
Recovery to get the error detector's clock from the incoming data stream.
6
Switch to the Analysis panel and then press the Error Location Capture icon.
7
Press the Start button to execute the measurement.
Status information is displayed in the lower section of the display.
8
Press Insert B button.
The two captured errors are illuminated red in the captured pattern grid. In the
result list, the 1st Bit-Error Location Capture indicates an error in bit 80. Use
the error navigation buttons (e.g. Next Error, Prev. Error) to display further bit
errors in the captured pattern.
Error Location Capture - Reference
The Error Location Capture measurement compares the expected pattern and the
pattern that was actually received, and shows the received pattern with the errored
bits marked.
Elements of the User Interface
The following buttons help you to analyze the results:
•
Hex / Bin
Advanced Analysis 6
Agilent J-BERT N4903B High-Performance Serial BERT 305