Gigabit Ethernet has been with us for many years as the standard choice for wired connectivity and has served most users well. Using all four pairs, it achieves a spectral efficiency of just 4 bits/Hz using 62.5MHz of bandwidth to push 1Gbit/s of throughput in both directions simultaneously. For many years, there hasn’t been a big push to upgrade in part as internet connection speeds were often below 1Gbit/s, but also because the next major step-up to 10GbE was more expensive than it was worth, requiring many people to upgrade their cabling and with a big cost in energy and heat dissipation. But with the adoption and popularisation of NBASE-T, 2.5GbE and 5GbE intermediate steps became possible with the benefits of being able to run 2.5GbE over existing Cat5e cabling. This is because it uses a more efficient 6.25 bits/Hz encoding and extends the bandwidth up to 100MHz to deliver 2.5Gbit/s or to 200MHz for 5Gbit/s. While I previously tested two USB 2.5GbE adapters with some simple…
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