Cat8.1 Ethernet Cable: Specs, Features, Pros & Cons
No twisted-pair grade with an RJ45 plug is faster than Category 8.1, and none has a shorter reach. Tested to a very high frequency, it carries the twenty-five and forty gigabit Ethernet modes that IEEE 802.3bq defines, but only across a thirty-meter channel, less than a third of the reach every slower grade is granted.
The limit is deliberate, because the grade was written for links inside a data center, from a top-of-rack switch to the servers in the racks around it, and the whole engineering trade is reach exchanged for frequency. Outside a rack, the distance limit rules it out of most structured cabling, which is planned around channels of up to a hundred meters.
The decimal in the name separates it from Category 8.2, which is built on different connectors entirely and will not mate with normal equipment. This variant is backward compatible with the RJ45 grades below it, so it plugs into ordinary switches and negotiates ordinary speeds, and a lead sold simply as Cat 8 with RJ45 plugs on both ends is this one.
It is always shielded, it specifies alien crosstalk limits for dense bundles, and it supports the full power-over-Ethernet range.
Home equipment never negotiates those top speeds, so a lead of this grade between a console and a router runs exactly as fast as a thinner, older grade would, and it is stiffer to bend around a desk or behind a TV stand.
Category strengths
Where the Cat8.1 Ethernet Cable beats the median
- A much higher bandwidth ?2,000 MHz vs 375 MHz (median)
- Has 25G / 40G Ethernet ?
- Has shielded construction ?
- Has alien crosstalk limits ?
Where the Cat8.1 Ethernet Cable trails the median
- A much lower reach at top speed ?30 m vs 100 m (median)
- A lower 10 Gigabit reach ?30 m vs 42.5 m (median)
How this VS Score was computed
Score 77: each known spec is measured against the median of all ethernet cables (8 products), then weighted; 50 means level with that median. In classes of six or more, a value beyond the class’s 10th–90th percentile range counts as that limit, so one extreme product cannot set the scale. 82% of the scoreable weight could be used; unknown values, features not applicable to this class and proxies (battery capacity where a rated life exists) add or remove nothing.
| Specification | This product | Cohort median | Score weight | Points moved |
|---|---|---|---|---|
| Bandwidth | 2,000 — capped at the class’s upper range (1,000) | 375 | 2.5 | +125.0 |
| 10 Gigabit Ethernet | Yes | 63% of the class have it | 2 | +100.0 |
| Native RJ45 connector | Yes | 75% of the class have it | 2 | +100.0 |
| Recognition for new installs | Yes | 75% of the class have it | 2 | +100.0 |
| Multi-gig (2.5G / 5G) | Yes | 75% of the class have it | 1.5 | +75.0 |
| 25G / 40G Ethernet | Yes | 13% of the class have it | 1 | +50.0 |
| Shielded construction | Yes | 38% of the class have it | 1 | +50.0 |
| Alien crosstalk limits | Yes | 33% of the class have it | 1 | +50.0 |
| Reach at top speed | 30 — capped at the class’s lower range (55) | 100 | 1.5 | −33.0 |
| 10 Gigabit reach | 30 | 42.5 | 2 | −30.0 |
| Typical shielding | F/UTP (foil screen) | U/UTP (unshielded) | 1.5 | +25.5 |
| Maximum data rate | 40 — capped at the class’s upper range (10) | 10 | 3 | +0.0 |
| Maximum PoE power | 90 | 90 | 1.5 | +0.0 |
Not scored: Gigabit Ethernet (standard for the class (88% have it)); Conductor material (unknown: not scored); Snagless boots (unknown: not scored); PoE++ (Type 4, 90 W) (standard for the class (88% have it)); Backward compatibility (standard for the class (100% have it)).
Editor’s note
Category 8.1 is the fastest twisted-pair cabling there is, and the first thing to understand about it is how short a distance that speed covers. Published in 2016, it is tested to 2000 MHz and carries 25GBASE-T and 40GBASE-T, but only across a 30-meter channel. This is a data-center standard, written for the run between a top-of-rack switch and the servers in the same rack or the next one, and the whole design trades reach for frequency.
Crucially, 8.1 is the RJ45 variant. ISO defines two flavors of Category 8: Class I, which is 8.1, keeps the familiar 8P8C connector and is explicitly backward compatible and interoperable with Class EA, the Cat 6a level. Class II, which is 8.2, uses GG45 or TERA instead. If you are buying Cat 8 that plugs into normal equipment, you are buying 8.1, and TIA recognizes it as Category 8 in ANSI/TIA-568.2-D. The cable is always shielded, with a foil screen at minimum.
The reason this matters to home buyers is that Cat 8 patch cords are sold aggressively to consumers as the ultimate upgrade, and for a home network they are close to pointless. No consumer equipment does 25 or 40 Gigabit over copper. Below that, a Cat 8 cord carries exactly the same 10 Gigabit that Cat 6a carries, while being thicker, stiffer and, because its channel is defined only to 30 meters, specified for less distance at 10 Gigabit than Cat 6a is.
In its intended home, short runs between data-center switches, it is the right cable and there is no alternative in twisted pair.
Specifications
Quality bars show where each figure sits between the lowest and highest of the 8 ethernet cables this VS Score is measured against.
Speed & reach
Construction & shielding
Power & connectors
Standards & status
Sources and verification
Where the specifications come from
- Official product pagestandards.ieee.org
- Datasheet or manualwebstore.iec.ch
Verification
- First published
- Specifications last checked
- Sheet completeness
- 21 of 28 specifications verified; the rest show as Unknown and are never estimated or scored
- Page type
- Product specification page — Compiled from the manufacturer’s published specifications and the cited sources; this is not a hands-on test.
- Basis
- Research-based: specifications and editorial text were compiled from the documents listed here and the manufacturer’s published data. We have not tested this unit ourselves; where independent measurements are mentioned they belong to the linked publication.
Ratings & reviews
No reviews yet. Be the first to share your experience.
The bottom line
The Cat8.1 Ethernet Cable earns a VS Score of 77, above the median of the 8 ethernet cables it is measured against (a score of 50 is level with that median).
- Who it’s for
- Short switch-to-server runs in a rack that need 25 or 40 Gigabit over copper.
- Who should look elsewhere
- Home and office networks. Nothing consumer-grade exceeds 10 Gigabit on copper, and Cat 6a carries that further.
- The trade-off that matters
- The highest twisted-pair bandwidth available, bought with a 30-meter ceiling and a stiff, always-shielded cable.
- The main alternative
- Cat6a Ethernet Cable: the longer ten gigabit reach for anything outside a rack
The VS Score is calculated from the weighted specifications above, each measured against the median of comparable ethernet cables — a shortlisting guide, not a substitute for your own priorities. See how we score.