Questions › Category: Optical Transceiver › Technical support for SFPP-T in Netgear XS716T switch
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Bob asked 6 years ago

I purchased two Optcore SFPP-T Netgear compatible transceivers in 2019 (invoices attached). I obtained these to provide multi-gig support on a Netgear XS716T switch. At the time I got them I confirmed basic compatibility with the XS716T switch, but I did not test performance. I recently found that these devices degrade transmission for data rates under one gigabit for either a 1 gigabit or 10 gigabit connection. I have reproduced the performance degradation in both transceivers, and in two different Netgear switches (XS716T and MS510TX). Both Netgear switches are running the latest released firmware. The transceiver serial numbers are S/N:1907150977 and 1907150979.

Do you know of any performance problems with these units?

Is there anything in switch configuration that I can try to resolve this problem?

What additional information can I provide that would help you troubleshoot this problem?

I would like to be able to use these transceivers, but I cannot with the performance degradation I am experiencing. Thank you for any help you can provide.

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2 Answers
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Cosmo17 Staff answered 6 years ago

Thanks for choosing our transceiver. Here is our suggestion.

  1. Please ensure use the SFPP-T on 10G SFP+ slot
  2. Use Cat6A or better cable

Please check it and look forward to your kindly feedback.

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bob answered 6 years ago

Thank you for your feedback. I was testing with Cat6A shielded cables (40 feet in length). I did some addition testing, and I noticed that the negotiated speed was 5Gb when I was expecting 10 Gb. This suggested to me that cabling could be an issue. I tested further as follows:

  • Cat6A shielded cable (40 feet) when connected to an RJ45 10 Gb port on the Netgear XS716T negotiates 10 GB and shows no performance degradation in transfer tests at 1.5 Gb speed.
  • Cat6A shielded cable (40 feet) when connected to an SPFF-T on the Netgear XS716T negotiates 5 Gb and there is performance degradation in transfer tests that at 1.5 Gb speeds.
  • Cat8 shielded cable (40 feet) when connected to SFPP-T on the Netgear XS716T negotiates 10 GB and shows no performance degradation in transfer tests at 1.5 Gb speed.

Based on the above I suspect either the Cat6A cable and/or the SPFF-T is out of specification, but I do not have access to the level of test equipment to identify which is at fault.
 
I am resolving my problems by migrating to Cat8 cables for use with the SFPP-T. I assume Cat7 would also solve the problem, but I didn’t test that configuration. If you have other customers raising similar issues, you may want to suggest they try Cat7 or Cat8 cables.