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Why a Copper RJ45 SFP+ May Not Achieve the Performance or Reach Expected for 10GBASE-T, 5GBASE-T or 2.5GBASE-T?

Whether it is an SFP+ adapter or a native RJ45 test port, high-speed Ethernet rates over twisted pairs require specific cable grades and have a maximum reach (lengths). So, just grabbing any RJ45 UTP patch cord may create some rate, errors and/or reach issues.

Whether it is an SFP+ adapter or a native RJ45 port, high-speed Ethernet rates over twisted pairs require specific cable grades and have a maximum reach (distance, length). Here are some typical values:

  • 10GBASE-T requires Cat 7 or Cat 8 cables and can reach 30m (100 ft)
  • 5GBASE-T requires Cat 6A cables and can reach 100m (328 ft)
  • 2.5GBASE-T requires Cat 5E cables and can reach 200m (656 ft)

Therefore, using a random or common/generic RJ45 UTP patch cord is not recommended, as it can introduce rate limitations, errors, and/or reach problems that significantly degrade link performance and compromise your test results.

Also verify the copper SFP+ label and datasheet to ensure it is explicitly specified for the target data rates and reach you intend to test.

Finally, when using VeEX test sets with RJ45 SFP+ support, always use the VeEX-recommended copper SFP+ module to ensure proper performance and reliable test results.