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Application Note
WEBSITE: www.jdsu.com/snt
Selecting the BERT Configuration1. Start the BERT application by clicking on the XGIG Maestro icon.2. Lock at least one BERT port on the Xgig Chassis. Refer to the User’s Guide for details.3. Select a configuration file from the file tree. Drag and drop it onto the BERT port. Options include: GE 32 bit Noise.PTC
GE CJTPAT.PTC GE CRPAT.PTC GE CSPAT.PTC
The Maxframe pattern should be used with a single BERT in loopback configuration (see Figure 4).The folder labeled “GE test in one direction” contains special configurations for testing one direction at a time (see Figure 6).4. Select the Link Speed by right clicking on the BERT port and selecting from the menu.
The following describes how to use the BERT to provide standard test configuration for DWDM installation. For this situation, two XGIG BERTs will be needed so the user can send and compare data simultaneously.
Connecting the Xgig-BERTHEAD TO HEAD TEST: This will simultaneously test both directions of data flow in the system under test. Connect the Tx and Rx terminals on one of the BERTs to a Fibre Channel or Gigabit Ethernet port on the System Under Test. Connect the Rx and Tx terminals on the other BERT to a port of the same type on the System Under Test. Run tests as shown in figure 1 below:
Using the JDSU Xgig® Bert for DWDM
XGIG-BERTIn Send and
Comparemode
XGIG-BERTIn Send and
Comparemode
SystemUnder
Test
Figure 1
Application Note: Using the JDSU Xgig® Bert for DWDM 2
Running the Bit Error Rate Test
Figure 2
4. The Bits Mismatched num-ber gives the count of bit errors detected by the BERT.
3. The Bit Error Rate shows the number of incorrect bits compared divided by the to-tal number of bits compared since last reset.
2. The status display shows the status of the send and receive state machines as well as a number of other metrics.
1. Click the Start Button to begin the test. To reset and start the BER measurement again, sim-ply click the Stop Button and then the Start Button.
Application Note: Using the JDSU Xgig® Bert for DWDM 3
Error InsertionIn order to verify that the Head to Head BERT test is connected cor-rectly, this Bit Err button allows you to insert bit errors one at a time at one of the BERTs.By checking the bit errors detected at the other BERT, you can verify your test configuration.
An Example with Errors Detected by the BERT1. The Bit Error Rate is greater
than the 10^-12 order of magnitude expected for a clean Fibre Channel link after 68 seconds.
2. The Bits Mismatched number shows the number of bits that did not match the expected pattern.
Figure 3
Application Note: Using the JDSU Xgig® Bert for DWDM 4
Right-click on the port column and select the desired mode of operation. Ports set to Latency mode appear on the Latency mea-surement tab.Select the Latency tab to run the Latency test.
The Latency test function sends a data pattern repeatedly and measures the delay between transmitting and receiving each instance of the data pattern. The display shows the results in terms of Instantaneous, Average, Maximum and Minimum delay. The Latency Data Points metric shows the number of repetitions of the test.
Figure 5
Figure 4
XGIG-BERT
SystemUnder
Test
Additional Configurations for Testing with the XGIG-BERT1. LOOPBACK TEST: Connect both the transmit (Tx) and receive (Rx) terminals on the BERT to a
Fibre Channel or Gigabit Ethernet port on the System Under Test. Then loop the data path back to the BERT. The loop back can be internal or external to the System Under Test.
2. LATENCY TEST: Using the same configuration as the loopback tests, this will allow you to measure the time delay through the system under test and back.
Application Note: Using the JDSU Xgig® Bert for DWDM 5
3. TEST ONE DIRECTION AT A TIME: You can also run an end to end test in one direction at a time. This requires loading a send configuration in one BERT and a compare configuration in the other. Just load the configurations found a “Test In One Direction” folder.
XGIG-BERT
In Send Only mode
XGIG-BERT
In Compare Only Mode
SystemUnder
Test
XGIG-BERT
In Compare Only mode
XGIG-BERT
In Send Only Mode
SystemUnder
Test
Figure 6
Logging Options1. Right click on a port column and select the Log submenu to access Options for the Log that is created
each time the BERT is stopped.2. Chose a file name template and destination folder.3. Enter values for how often to add a log entry during operation and how many log entries to make.
Figure 7
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Product specifications and descriptions in this document subject to change without notice. © 2009 JDS Uniphase Corporation 30162817 500 0909 XGIGBERTDWDM.CS.SAN.TM.AE Sept 2009
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WEBSITE: www.jdsu.com/snt
Application Note: Using the JDSU Xgig® Bert for DWDM
Display Options1. Right click in the port column and select LEDs to open a new window that just contains the LEDs
in a larger format.2. Right click on the port column and select the text size submenu to choose a text size for the Param-
eter table.3. Right click on the port column and select Parameters to open a dialog box that allows you to
choose what rows appear for all BERT ports in the Parameter table.
Figure 8
