this post was submitted on 14 Nov 2023
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Home Networking
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Ignoring the use of fiber here, the IEEE 802.3ab defines Gigabit Ethernet over UTP at 1000Base-T over 100 meters. But, this standard was created around the use of CAT-5 cabling. As tech has progressed, it became easily possible to achieve faster data transfer rates with what is still considered “Gigabit Capable” ports and cables. Just because something is rated as Gigabit, does not in any way mean that is the max it is capable of. MystiCom was able to use CAT-5 for 10Gb/s transfer back in 2002. Notwithstanding that you completely omitted any other hardware capabilities/limitations such as backplanes or line cards, you simply saying “you can’t” and that gigabit ports “cap out around 940mbps” is simply incorrect. What you seem to be referring to are the data rates that ISP’s offer in their brochures where they throw up an asterisk and say that over head may reduce their gigabit plan to 940mbps max. So yes, while the above is not incredibly in-depth, you way oversimplified what gigabit entails and what impacts that performance. And telling someone that “anything reported over that is a bad measurement or a bug” is just incorrect information.
I think you need to remember we are in /HomeNetworking and not /Networking. I am very aware that spec does not dictate hardware capability. I am very aware that you can run 10gig over cat 5 (and other various configs beyond the "spec") in certain cases. I am very aware that IPSs overprovision. What I am NOT aware of is anyone who has gone to best buy, purchased a modem and wifi-router with gigabit NICs, gone home to their gigabit ISP plan, plugged and played, and magically gotten 1.2Gbps to their client device. Simplifying for the purposes of home networking to say that given a standard Gig NIC > Cat whatever cable > Gig NIC negotiated at 1000Base-T will run ~940Mbps is perfectly valid, especially in the context of this post where the user has one data point showing 1.2Gbps, all other sites showing ~940Mbps, and his set up is what I described above. You are reading way to far into my (I'll agree here) aggressive use of the word "cant" and trying to apply it en masse to all possible situations. In the context of home networking, the OPs issue, and anyone else experiencing similar things, this is quite clearly a bad measurement or a bug. Also, I am not referring to data rates in the brochure. Go run some Iperf tests on the setup I described above and let me know what you get. Verizon does clearly say 940, but I suspect this is because they know when they drop off their ONT with a Gig interface, they know dam well its expected to be ~940Mbps on the top end. They didn't pull this number out of their ass.