What is a LAN Cable?
A LAN cable β formally called an Ethernet cable β is a physical cable that connects computers, Wi-Fi routers, network switches, NAS devices, gaming consoles, and other network equipment to form a wired LAN (Local Area Network). It uses an RJ-45 connector at each end and carries data using twisted pairs of copper wires inside a protective jacket.
Wired Ethernet consistently outperforms Wi-Fi in three critical areas: raw speed, latency (ping), and reliability. For online gaming, video conferencing, 4K/8K streaming, NAS file transfers, and work-from-home setups where a dropped connection means a dropped call, a LAN cable is the simplest and most effective way to ensure a rock-solid network connection.
In-Depth
Cable Categories and Speeds
LAN cables are classified by “Category” (Cat) ratings defined by the TIA/EIA-568 standard. Higher category numbers support faster speeds and wider bandwidth β meaning they can carry more data simultaneously.
| Category | Max Speed | Bandwidth | Max Length (full speed) | Typical Use |
|---|---|---|---|---|
| Cat5e | 1 Gbps | 100 MHz | 100 m | Legacy home networks (minimum acceptable today) |
| Cat6 | 1 Gbps (10 Gbps up to 55 m) | 250 MHz | 100 m (55 m for 10G) | Current standard for home and office |
| Cat6A | 10 Gbps | 500 MHz | 100 m | 2.5G/5G/10G networks, NAS, future-proofing |
| Cat7 | 10 Gbps | 600 MHz | 100 m | Shielded data-center environments |
| Cat8 | 25-40 Gbps | 2,000 MHz | 30 m | Short-run data-center switch-to-switch links |
For most homes and offices today, Cat6 is the practical standard β it handles gigabit connections effortlessly and supports 10 Gbps over short runs. Cat6A is the smart choice for future-proofing, especially if you plan to upgrade to multi-gigabit internet (2.5 Gbps or faster) or run a 10 GbE NAS. Cat7 and Cat8 are overkill for residential use and can even introduce grounding issues if connected to consumer equipment that lacks shielded ports.
Cable Shapes and Construction
LAN cables come in three physical profiles:
- Round (standard) β The traditional cable with the best shielding and signal integrity. Ideal for permanent in-wall installations, server racks, and any run where longevity matters.
- Flat β Thin enough to slip under carpets, through door frames, and along baseboards without drilling holes. Convenient for home routing but slightly more susceptible to crosstalk and physical damage.
- Slim (ultra-thin) β Very flexible and easy to manage in tight desktop spaces. Less durable than standard cables and best for short patch connections.
Shielded vs. Unshielded (STP vs. UTP)
UTP (Unshielded Twisted Pair) cables are the default for home and office environments and work perfectly in the vast majority of cases. The twist pattern of the wire pairs inherently rejects most electromagnetic interference.
STP (Shielded Twisted Pair) cables add metallic foil or braided shielding around each pair or the entire cable bundle to further reject interference. They are necessary in electrically noisy environments β factories, medical imaging rooms, or anywhere near heavy electrical equipment. Cat7 and Cat8 cables are inherently shielded, but both the cable and the equipment ports must be properly grounded for the shielding to function correctly. Using shielded cable with ungrounded consumer equipment can actually worsen performance.
PoE (Power over Ethernet)
LAN cables can carry both data and electrical power simultaneously using PoE (Power over Ethernet). This powers devices like IP cameras, VoIP phones, wireless access points, and smart-home sensors without needing a separate power cable. Cat5e and above support PoE, but higher-power PoE++ (up to 90 W) benefits from the thicker conductors and better heat dissipation of Cat6A cable.
Durability and Longevity
A well-installed LAN cable can last 20 years or more β far outlasting the devices connected to it. For in-wall installations, invest in solid-core cable (rather than stranded), which maintains signal integrity over long runs and terminates cleanly into wall plates and patch panels. For patch cables between devices, stranded-core cable is more flexible and tolerates repeated bending without breaking. Avoid sharp bends (below the minimum bend radius), stapling cables too tightly, and running LAN cables parallel to high-voltage power lines, which can introduce electromagnetic interference.
How to Choose
1. Match the Category to Your Network Speed
If your internet plan and router top out at 1 Gbps, Cat6 is the right and most economical choice. If you have or plan to get multi-gigabit service (2.5 Gbps or 10 Gbps), or if you are building a NAS-centric home network, step up to Cat6A. There is no practical residential benefit to Cat7 or Cat8.
2. Pick the Right Shape for Your Environment
For permanent in-wall installations, use round (standard) cables β they will last for decades. For surface runs across floors and under doors, flat cables are far easier to work with and nearly invisible. For patching between nearby devices on a desk, slim cables reduce clutter.
3. Buy the Right Length, Plus a Little Extra
Measure your intended cable route and add 1-2 meters of slack for flexibility. Excessive cable creates management headaches and can technically degrade signal quality over extremely long runs (though Ethernet’s 100 m limit is generous for most homes). Pre-terminated cables in common lengths (1 m, 2 m, 5 m, 10 m, 15 m, 20 m) are the easiest option; for custom lengths or in-wall runs, buying bulk cable and crimping your own RJ-45 ends gives complete control.
Recommended Products
When choosing a LAN cable, the cable category (speed rating), length, and routing environment are the key factors. Here are three recommended products for home and office use.
Elecom LD-GPAT/BU20 (Cat6A LAN Cable 2m)
If you’re unsure, go with this. A well-rounded choice. A Cat6A cable supporting 10 Gigabit connections, featuring a latch-protection connector that resists breakage during frequent plugging and unplugging. The 2m length is ideal for router-to-PC connections, and the slim design makes routing easy. Perfect for Wi-Fi 6E or wired LAN upgrades.
BUFFALO BSEA5L10BK (Cat5e LAN Cable 10m)
Best value. Perfect if you want to keep costs down. A Gigabit-ready Cat5e cable in a 10m length for connecting rooms or reaching devices far from your router. BUFFALO’s reliable build quality at a budget-friendly price, widely used in home LAN setups for TVs, gaming consoles, and other devices that benefit from a wired connection.
Sanwa Supply KB-T7-01BL (Cat7 LAN Cable 1m)
For high-speed specs, this is the one to choose. A Cat7 cable with 10 Gigabit support and full S/FTP shielding for maximum noise rejectionβideal for servers or high-performance NAS connections. The 1m length keeps cable runs tidy between adjacent devices, delivering Cat7 quality without breaking the budget.
The Bottom Line
A LAN cable is the most reliable, lowest-latency way to connect any device to your network. Cat6 handles today’s gigabit speeds affordably, and Cat6A future-proofs you for multi-gigabit connections at a modest premium. Choose the cable shape that suits your routing situation, buy an appropriate length with a little slack, and enjoy a connection that Wi-Fi simply cannot match for speed, consistency, and reliability.