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Cat5e, Cat6, Cat6a, Cat7, UTP, S/FTP, T568A, T568B. Eight bits of jargon standing between you and a decision that will outlive your router, your ISP and probably your sofa. This guide translates all of it — for the person who just wants the right cable, and for the engineer who wants the numbers behind it.
باختصار: for anything you are installing today, Cat6 is the minimum worth putting in a wall and Cat6a is what you specify when the run is long, the bundle is dense, the device draws serious power over the cable, or you simply do not want to open that wall again. Cat5e belongs only in walls that already contain it. Cat7 is a trap — it is not recognised by the American TIA standards at all, and the "Cat7" cable sold with ordinary RJ45 ends is, in practice, Cat6a with a higher price sticker. Cat8 is a real standard, but it is a 30-metre data-centre cable and has no business in a home or office riser.
The reason this decision matters more than it looks is simple arithmetic: the cable is almost never the cost. A box of Cat6a costs a fraction of the labour needed to chase a wall, pull the run, terminate it, patch it, test it and make the plaster good again. Choosing the cheaper cable saves you a rounding error and permanently caps what the building can carry. Nobody has ever regretted the extra category. A great many people have regretted the missing one.
The rest of this page is the reasoning. What is actually inside the sheath and why it is twisted. What each category number really promises. What the shielding letters mean and when shielding helps — and when it actively hurts. How RJ45 termination works and what the colour codes are. What the label on the drum does عادةً tell you, including the one substitution that quietly ruins PoE installations across the region. And finally, where copper stops being the right answer and fibre begins.
Every network cable from Cat5e to Cat8 is the same basic object: four pairs of copper conductors, each pair twisted around itself, wrapped in a jacket. Almost everything that separates the categories is a refinement of that one idea.
Two conductors carry each signal, and they carry it as a difference. Whatever electrical noise the world throws at the cable — a fluorescent ballast, a lift motor, a mains cable running alongside — lands on both conductors of a pair almost equally, because the twist keeps them in the same physical space. The receiver subtracts one from the other, the shared noise vanishes, and the signal survives. That is the whole trick, and it is why a cheap twisted pair outperforms an expensive untwisted one.
The pairs are then twisted at deliberately different rates from each other, so that pair one and pair three do not fall into step and start coupling. That coupling has a name — crosstalk — and controlling it is essentially what you are buying when you move up a category. Cat6 adds a plastic spline down the centre to hold the four pairs further apart. Cat6a goes further and, for the first time, specifies performance against alien crosstalk: interference leaking not between pairs inside one cable, but between separate cables bundled tightly together in a tray or a hot ceiling void. That single addition is the reason Cat6a holds 10 Gigabit over a full 100 metres where Cat6 gives up around 55.
Each step up buys bandwidth headroom, tighter crosstalk control and thicker copper. Here is what that means in practice, and the honest verdict on each.
| Category | Bandwidth | Max speed @ 100 m | 10 Gbps reach | Standard body | Where it belongs |
|---|---|---|---|---|---|
| Cat5 | 100 MHz | 100 Mbps | لا شيء | TIA / ISO (withdrawn) | Nowhere. If you find it, it predates 2001 — replace it. |
| Cat5e | 100 MHz | 1 Gbps | لا شيء | TIA / ISO Class D | Existing runs that test clean. Not for new work. |
| Cat6 | 250 MHz | 5 Gbps | ~55 m | TIA / ISO Class E | Homes, apartments, short office runs. The honest minimum. |
| Cat6a | 500 MHz | 10 Gbps | Full 100 m | TIA / ISO Class EA | Offices, risers, long runs, dense bundles, high-power PoE, villas built once. |
| Cat7 / Cat7a | 600 / 1000 MHz | 10 Gbps | Full 100 m | ISO Class F / FA only — not recognised by TIA | Specialist European installs using GG45 or TERA connectors. Not with an RJ45 on the end. |
| Cat8 | 2000 MHz | n/a — 30 m limit | 25G / 40G to 30 m | TIA / ISO Class I & II | Data-centre top-of-rack to server. Never a building backbone. |
Two things this table will not tell you, and both matter more than the category: a link runs at the speed of its weakest component, so Cat6a cable terminated into Cat6 keystones is a Cat6 link; and there is no such thing as "Cat6e" — it is a marketing label, not a standard. If a supplier quotes Cat6e, ask which of Cat6 or Cat6a they are actually shipping.
The shielding code looks cryptic and is actually mechanical. It is written as XX/YZZ: the letters before the slash describe the shield around the whole cable, the letter after it describes what each individual pair gets.
U means unshielded, F means a foil wrap, and S means a woven braid. So U/UTP is a plain unshielded cable with unshielded pairs; F/UTP has one foil around everything; U/FTP gives each pair its own foil but nothing overall; and S/FTP is the full construction — a braid around the cable and a foil around every pair. You will still see the older shorthand STP, FTP and SFTP on datasheets and packaging; they refer to the same constructions, less precisely.
This is the part of the subject where the marketing and the engineering openly disagree — and where people spend money for nothing. It deserves saying plainly.
Category 7 is a real specification — but it is an ISO/IEC one, defined as Class F, and the American TIA standards body never recognised it. TIA went from Cat6a straight to Cat8. That alone would be a footnote, except for the second half: genuine Cat7 does not use an RJ45 connector at all. Class F is specified around the GG45 and TERA connectors, which are physically different, considerably more expensive, and almost never seen outside specialist European installations.
The RJ45 connector itself is characterised only to 500 MHz — which is exactly the Cat6a limit. So the moment a "600 MHz Cat7" cable is terminated into an ordinary RJ45 jack, the link is capped at Cat6a performance by the connector. The cable may well be built to a high standard, heavily shielded and pleasant to work with. It is simply not delivering anything a good Cat6a channel would not, and you are paying a premium plus the cost and complexity of shielding you may not need. The same applies with more force to "Cat8" patch leads sold for home use: Cat8 is a 30-metre data-centre specification for 25 and 40 Gigabit switch-to-server links, on equipment almost nobody has outside a rack.
None of this is a reason to distrust your supplier — the labelling is industry-wide and mostly repeated in good faith. It is a reason to ask one question before you buy: "is this a TIA-recognised category, and is the connector rated for it?" For every building QSN cables in the UAE, the answer that survives that question is Cat6 or Cat6a, terminated into components rated to match.
Two wiring schemes exist. They are electrically identical, they differ only in which pair sits on which pins, and the single rule that matters is that both ends of a run use the same one. Switch between them below.
| Pin | Conductor colour | Pair | 100 Mbps | 1 Gbps and above | PoE (4-pair) |
|---|---|---|---|---|---|
| 1 | White / OrangeWhite / Green | with pin 2 | Transmit | Used | Powered |
| 2 | OrangeGreen | with pin 1 | Transmit | Used | Powered |
| 3 | White / GreenWhite / Orange | with pin 6 | Receive | Used | Powered |
| 4 | Blue | with pin 5 | Idle | Used | Powered |
| 5 | White / Blue | with pin 4 | Idle | Used | Powered |
| 6 | GreenOrange | with pin 3 | Receive | Used | Powered |
| 7 | White / Brown | with pin 8 | Idle | Used | Powered |
| 8 | Brown | with pin 7 | Idle | Used | Powered |
The two schemes exist for a historical reason: T568A keeps compatibility with older American residential telephone wiring, and remains the required scheme in some US federal and residential specifications. T568B descends from the earlier AT&T 258A practice and became the commercial norm almost everywhere else, the UAE included. Neither is faster or better. Pick one, write it on the rack label, and never mix them in the same building.
Notice what 100 Mbps used versus what everything since uses. Old Fast Ethernet only ever needed two pairs, which is why some very old buildings have four-pair cable with only four conductors actually punched down — and why those outlets mysteriously refuse to negotiate a gigabit today. Gigabit and 10 Gigabit use all four pairs in both directions, and four-pair PoE carries power on all eight conductors. A "working" socket that only has four wires in it is a socket that will fail the moment you put a modern device on it.
Two cables can both say "Cat6a, 305 m" on the box and be entirely different products. These are the four things worth checking before anyone pulls a metre of it into your building.
One single strand of copper per conductor. Lower resistance, better high-frequency performance, and it holds its shape — which is what a punch-down contact needs to bite into.
Many fine strands per conductor. Slightly higher attenuation, so patch leads count against your channel budget — but it survives being coiled, trodden on and yanked out of a laptop daily.
Data does not warm a cable. Power does — and modern access points, PTZ cameras, door stations and LED lighting draw a great deal of it down the same eight conductors.
Current flowing through copper generates heat, and cables bundled together cannot shed it — the ones in the middle of the bundle are insulated by the ones around them. Warmer copper has higher resistance, higher resistance means more signal loss, and the standards respond by shortening the permitted length as temperature rises. In a Dubai ceiling void in August, that derating is not a theoretical exercise.
Three practical consequences follow, and they cost nothing at design stage. Use thicker conductors — 23 AWG Cat6a has meaningfully more copper cross-section than 24 AWG Cat5e and runs cooler for the same load. Keep bundles smaller — several loose bundles of twenty-four beat one heroic bundle of a hundred, and cost the same in cable. And never, under any circumstances, run high-power PoE over copper-clad aluminium, which combines the worst resistance with the worst heat behaviour and is the reason behind a surprising share of the "our cameras keep rebooting" calls we take.
The 100-metre limit is not a suggestion, and there is no category of copper that extends it. Past that line the answer changes material, not number.
Three questions. The answer follows the same rules our engineers apply on site — and it will tell you when the honest answer is "not copper at all".
Indicative guidance for a single permanent run. A real specification also depends on containment, routing and the equipment at both ends — which is what a site survey establishes.
A short run to an ordinary device in a normal indoor route. Cat6 unshielded carries a gigabit comfortably, is easy to route, and still leaves 2.5 and 10 Gigabit headroom at this distance.
The questions people ask once they realise the cable outlives everything plugged into it.
New build, fit-out or retrofit — we specify the category, the shielding and the containment around how the building will actually be used, install it, certify every run and hand you the test results. Not a wire map. A certification report.