VIAVI TestCenter: Intermittent CRC errors on DX2-100G-T12

Issue: • Spirent TestCenter (STC) is reporting intermittent Rx FCS errors on various ports across three DX3-100G-T12 modules. The DUT also receives a few FCS errors from STC but far less. • Although most testing has been performed at 95% load, the issue has been seen at 30% load as well. Frequency and amount of Rx FCS errors: • About 1-2% of the tests contain STC reported Rx FCS errors • Example: Out of 26,774,394 frames, there were 395 FCS errors Test procedure: • 512 byte frames • power cycle DUT • wait for links to come up • start sequencer • repeat Their setup: • DUTs • There are several DUTs being tested. • Transceivers: • They look to be Aruba/HPE branded optics • Avago 4678 = Aruba JL309A, 1990-4678 • Finisar 4680 = Aruba JL309A, 1990-4680 • Both are 100G QSFP28 MPO SR4 100m 12-fiber MPO MMF Transceiver • Topology       STC info: • 5.36 • DX3-100G-T12 (80-001070) What we know: • The "signal integrity" does not seem to be an issue here since the errors are intermittent. • DUT ports b2b have no issues. • STC ports b2b have no issues. • The fiber optic cables have been cleaned to make sure that connections are clean. • Some transceiver swapping has been performed but this seems to not be a factor since the issue is "widespread," albeit infrequent. Other observations: • The frames captured that have CRC errors are non-512 byte frames.

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