Beyond Cat6a — the data-center grades: what they do, why most of the world skips them, and how to spot them in a teardown.
Cat7 and Cat8 exist for one customer: the data center. Higher frequencies, heavier shielding, specialized connectors — and price tags to match. Most of the world will never install them. But if you are decommissioning a data center or buying its pull-out, you need to know what you are looking at.
We buy data center cable in volume — including Cat7/Cat8. Sell it →
Each pair individually shielded plus an overall braid (S/FTP). 10-gigabit to 100m with enormous headroom. The catch: Cat7 was never ratified by the TIA (the US standards body) — it is an ISO standard — and it uses non-RJ45 connectors (GG45/TERA) in its strictest form. Result: rare in the US, more common in Europe. When you find it, it is almost always data center or industrial.
The current ceiling: 2 GHz bandwidth, 25GBASE-T and 40GBASE-T — but only to 30 meters. Fully shielded, RJ45-compatible connectors. Built for switch-to-server links inside the data center, where 30m covers the row. Outside the data center it has essentially no use case — which is why you only meet it in teardowns.
For 99% of installations, Cat6a is the rational ceiling — Cat7/8’s extra performance serves links that fiber usually serves better and cheaper. Their real significance for most readers: identification. Data center pull-out containing Cat7/Cat8 is premium scrap and premium resale — heavy copper, full shielding, short lengths. Know it when you see it.
The jacket print is definitive: “CAT7” or “CAT8”, “600MHz” or “2000MHz”, and shielding codes (S/FTP). Physically: dramatically thicker and stiffer than Cat6a, obviously shielded, often with non-standard colors. Lengths run short (data center rows, not building risers). If you are clearing a data center and the cable looks like armored hose compared to normal Ethernet — check the jacket before you scrap it. Misidentified Cat8 sold as scrap copper is money left on the table; properly identified, it has a buyer waiting.
Cat7 should have been the future — 600 MHz, fully shielded, 10-gig with headroom to spare. It lost for unglamorous reasons: it was never ratified by the TIA (the US body), so American manufacturers had no standard to build to; its GG45/TERA connectors broke RJ45 compatibility, the most valuable property in networking; and by the time the market wanted 10-gig, Cat6a delivered it over familiar RJ45. The lesson: in infrastructure, compatibility beats specifications. Cat8 learned it — RJ45-compatible, TIA-ratified — but arrived to a world where fiber had already taken the speeds it serves. Standards history matters to sellers because it predicts the installed base: TIA-ratified categories (5e, 6, 6a, 8) are what you will actually find.
Almost certainly not — Cat6a covers every realistic commercial need, and fiber covers everything beyond it. Cat7/8 serve data-center switch-to-server links.
Cat7: 600 MHz, 10-gig/100m, fully shielded, non-TIA standard. Cat8: 2000 MHz, 25/40-gig but only 30m, RJ45-compatible. Both are data-center cable.
No — for the links Cat8 serves (short, very fast), fiber is usually cheaper, lighter, and future-proof. Cat8 exists for copper-mandated niches.
Yes — premium copper content and a niche resale market. Identify it from the jacket print and sell it as what it is, not as scrap.
Jacket markings (category, footage, plenum/riser), box labels, and quantity. The jacket print is the entire specification.
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