VIAVI TestCenter: UDP destination port is transmitted as zero instead of the configured value after Fill type is set to Increment.

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Thursday, October 16, 2025

Question:

Customer observed that when the “Fill Type” is set to “increment”, the UDP destination port is transmitted as zero instead of the configured value. This problem does not occur when the fill type is set to constant or PRBS. We have verified the same on SPIRENT TESTCENTER version 4.44 using EDM and CM cards. We also noticed the this problem occurs only for Fixed Frame length and not with other Frame size options like Increment/Decrement/Random/Auto.

Answer:

N/A

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