Wi-Fi vs 5G vs Ethernet: How Business Connectivity Works

Most complaints about “the internet” at work are really about one of three things: the connection bought from a provider, the network inside the building, or the device at the end of it. Wi-Fi, 5G, and Ethernet are often compared as rivals, but each is simply a way of moving data over the last stretch to a device, and each makes a different trade between speed, reach, reliability, mobility, and cost.

This guide explains how each works, what the version numbers and cable categories mean, which spec-sheet figures matter, and how to choose a sensible mix for an office, warehouse, shop, or remote team. For the wider picture of LANs and WANs, start with our guide to computer networks.

What is the real difference between wired and wireless connectivity?

A wired connection sends signals down a dedicated cable. Nobody else shares it, so each device gets its full rated speed to the switch, and interference from neighbors or metal shelving is irrelevant. The cost is that the device stays where the cable is, and someone has to install it.

Wireless sends radio waves through the air, and radio is shared. Devices on the same channel take turns, so an access point’s capacity is divided among its users. Signals also weaken with distance and through walls, glass, metal, and water, including people. In return you get mobility and far less installation work per device.

How does Ethernet work, and which cable should you install?

Ethernet (the IEEE 802.3 standards) is the familiar cable with a plug on each end. Cables run from wall sockets to a switch in a comms cupboard, which forwards traffic between devices and up to the router or firewall. A copper run is limited to 100 meters (about 328 feet), patch leads included.

Cable categories in plain terms

• Cat5e: 1 Gbps over the full 100 meters; common in older buildings and often fine for 2.5 Gbps on shorter runs.
• Cat6: 1 Gbps at 100 meters and 10 Gbps over shorter distances, commonly cited as about 55 meters.
• Cat6a: 10 Gbps over the full 100 meters; the usual choice for new commercial installations, especially for Wi-Fi 6E or Wi-Fi 7 access points.

Cabling is expected to last 15 years or more, while switches and access points are replaced every five to seven. That is why many consultants recommend Cat6a in a new fit-out: pulling cable through finished ceilings later costs far more than the cable. Beyond 100 meters, such as between buildings, networks use fiber-optic links, which carry light, run for kilometers, and ignore electrical interference.

Power over Ethernet (PoE)

PoE sends electrical power down the data cable, so access points, desk phones, cameras, and badge readers need only one connection. The main standards are 802.3af (up to 15.4 watts per port), PoE+ 802.3at (up to 30 watts), and 802.3bt (up to 60 or 90 watts). Check a switch’s total “PoE budget” as well as the per-port figure: a 370-watt switch cannot run twenty 30-watt devices at full draw.

Why Ethernet is the reliability benchmark

A wired link inside a building typically adds well under a millisecond of delay and delivers close to its rated speed all day, however many people are online. If a device never moves and a socket is nearby, the cable wins. That is why the machines in what is a server are always wired.

How does Wi-Fi work, and what do the version numbers mean?

Wi-Fi is the consumer name for the IEEE 802.11 standards. An access point (AP), cabled to the network, broadcasts a signal that laptops and phones join. At home the router and AP are one box; businesses mount dedicated, centrally managed APs on ceilings. The speeds below are theoretical maximums for each standard; a real laptop sharing an AP sees a fraction of them.

• Wi-Fi 5 (802.11ac): 5 GHz; about 3.5 Gbps theoretical in common configurations.
• Wi-Fi 6 (802.11ax): 2.4 and 5 GHz; about 9.6 Gbps theoretical. Its real gain is efficiency in crowded spaces, serving many devices at once rather than strictly in turn.
• Wi-Fi 6E: Wi-Fi 6 extended into the less congested 6 GHz band, where regulators allow it.
• Wi-Fi 7 (802.11be): wider 320 MHz channels and Multi-Link Operation, letting a device use several bands at once; roughly 46 Gbps theoretical. As of 2026 the equipment is widely available, though many business laptops still connect on Wi-Fi 6 or 6E.

Why does Wi-Fi slow down with distance, walls, and crowds?

Three bands, one trade-off

Lower frequencies travel further and penetrate walls better; higher frequencies carry more data but fade faster.

• 2.4 GHz: longest range, but effectively three non-overlapping channels and heavy congestion. Best for low-bandwidth sensors.
• 5 GHz: many more channels and higher speeds, shorter range. The workhorse of business networks.
• 6 GHz: the widest, cleanest spectrum, with range similar to or slightly below 5 GHz. Availability and power limits vary by country.

Access points and mesh

Business Wi-Fi is designed for capacity, not just coverage. One powerful AP that “reaches” the whole floor is a classic mistake: distant devices connect slowly, hog airtime, and drag everyone down. Several lower-power APs, each serving a smaller area, work better. Mesh systems link APs wirelessly; each wireless hop consumes capacity, so cable every AP you can and use mesh only for gaps.

Interference

Wi-Fi shares unlicensed spectrum with neighbors and Bluetooth, while concrete, metal racking, coated glass, and even bottled stock absorb or reflect signal. A site survey, modeled from floor plans or measured on-site, is the standard way to decide how many APs you need and where.

How do 4G and 5G cellular networks fit into business connectivity?

Operators run cellular networks on licensed spectrum, so interference is lower than on Wi-Fi, but you share each tower with nearby subscribers. 4G LTE remains the backbone in many areas, with 5G layered on top.

Sub-6 GHz versus mmWave

Sub-6 GHz 5G covers large areas and passes through buildings reasonably well; it is the 5G most people use. Millimeter wave (roughly 24 GHz and above) offers huge capacity but reaches only a few hundred meters, is blocked by walls and foliage, and appears mainly in dense city centers, stadiums, and transport hubs. The 5G standard targets a theoretical peak of 20 Gbps downlink; real-world speeds are a small fraction of that and vary by location, time, and operator.

Private 5G

A private 5G network is built for one organization on a factory, port, mine, or campus, using dedicated spectrum such as the shared CBRS band in the United States or local licenses in several European and Asian countries. It suits large outdoor areas, vehicles, and robots that need seamless handover and guaranteed capacity. As of 2026 it is mainly a large-enterprise option.

Fixed wireless access (FWA)

FWA uses the cellular network as a building’s internet line: a 5G or 4G router, sometimes with an outdoor antenna, replaces fiber or cable. It installs in days, suiting new branches and pop-ups. Speeds depend on signal and cell load, and some plans have fair-use limits, so read the terms.

What do speed, latency, and reliability actually mean?

Throughput is data per second, in megabits or gigabits per second; 1 Gbps is roughly 125 megabytes per second, as our guide to bits and bytes explains. Latency is round-trip delay in milliseconds, jitter is how much that delay varies, and reliability covers packet loss and drop-outs.

For office work, latency and jitter usually matter more than throughput. An HD video call needs only a few megabits per second but turns choppy when delay spikes, and voice is just as sensitive, which is why vendors in our business phone and VoIP comparison publish latency and loss requirements. In the table, speeds are theoretical maximums and latencies typical ranges.

How do you keep wired and wireless business networks secure?

Wireless signals leak beyond your walls, and a live, unused wall socket in reception is an open door too.

• Use WPA3. WPA3-Personal replaces the old password handshake with SAE, which resists offline guessing. WPA3-Enterprise authenticates each user against a directory, so a leaver’s access is revoked without changing a shared password. The 6 GHz band requires WPA3.
• Separate guest Wi-Fi. Visitors and personal phones get internet access but no route to printers, file shares, or payment terminals.
• Segment the network. VLANs and firewall rules split one network into zones for staff, guests, point-of-sale, cameras, and building systems, so a compromised camera cannot reach finance. Payment card rules effectively expect this isolation.
• Cover cellular devices. SIM-connected laptops and routers sit outside the office firewall, so use a business VPN or zero-trust service to reach company resources.

For firewalls and monitoring, see network security basics.

Which internet connections can a business buy, and why should you have two?

The line from your building to the internet is a separate purchase, and it is where most outages happen. Our guide on how the internet works explains what lies beyond it.

• Fiber: the best option where available, often symmetric (equal upload and download), which helps backups and video calls. Dedicated fiber with a service-level agreement costs more than shared business broadband but guarantees speed and repair times.
• Cable: uses the coaxial TV network; strong downloads, much lower uploads, capacity shared with neighbors.
• DSL: old telephone copper; speed falls with distance from the exchange, and many operators are retiring it.
• Fixed wireless: 4G/5G FWA, or point-to-point radio links from specialist providers.
• Satellite: geostationary satellites sit about 36,000 km up, giving round-trip latency of roughly 600 ms or more. Low Earth orbit (LEO) constellations fly at a few hundred to about 1,200 km and typically deliver latency in the tens of milliseconds, making them practical for rural sites, construction projects, and backup.

Redundancy and failover

A backup only helps if it fails for different reasons. Two fiber lines sharing one street duct both die when a digger cuts it. The strongest pairing mixes technologies and routes, such as fiber plus 5G FWA or LEO satellite. A dual-WAN firewall or SD-WAN appliance detects the outage and switches traffic automatically, often within seconds. Many firms keep the backup on a cheaper plan reserved for essentials.

Which connection fits which kind of workplace?

Desk-based offices

Cable every fixed desk with a desktop or dock, every meeting-room system, and every AP. Use Wi-Fi 6 or newer for laptops and phones, planning roughly one AP per 20 to 30 active users in open-plan space as a starting point for the site survey to refine.

Warehouses and factories

High ceilings, metal racking, and changing stock make Wi-Fi harder. Scanners and forklift terminals need smooth roaming between APs, so directional antennas along aisles, industrial-grade APs, and fiber between distant switches are common. Ports and yards are where private 5G starts to pay off.

Retail and hospitality

Wire payment terminals where possible and keep them on their own segment. Put customer Wi-Fi on an isolated, rate-limited guest network. A cellular failover router is close to essential: if card payments stop, sales stop.

Remote and hybrid workers

Home internet is outside your control, but advise staff to plug in by cable for important calls and keep a phone hotspot as backup. Route company data through a VPN or zero-trust service and manage devices remotely; our RMM and IT management software comparison covers the tools.

What does this mean for your business?

Connectivity is mostly long-lived, one-off investment, so focus on fit and failure rather than the newest standard. Start from how people and equipment actually use the network; our overview of IT infrastructure shows how it connects to servers, cloud, and support.

Main cost drivers

• Cabling labor: cheapest during a fit-out.
• Switches and APs: including PoE capacity and any cloud-management subscription.
• Internet lines: SLA-backed dedicated fiber costs noticeably more than shared broadband; a backup line adds a smaller monthly fee.
• Ongoing management: firmware, monitoring, and changes, in-house or via a managed provider.

Questions to ask your IT team or vendor

1. Will you do a site survey, and will we get the coverage map?
2. Which cable category will you install, and will each run be certified with test results?
3. How many users is each AP designed for, not just how much area it covers?
4. How fast does failover happen when the main line drops, and has it been tested?
5. How are guest, staff, payment, and camera traffic separated?
6. What upload speed and repair time does the internet contract guarantee?

Frequently Asked Questions