What Is a Wireless Access Point?

A wireless access point is a network device with one or more Wi-Fi radios and an Ethernet port. It broadcasts a network name (SSID), lets laptops, tablets, scanners and other Wi-Fi clients join, and passes their traffic onto the wired network as if they were plugged into a switch. In networking terms it is a bridge between IEEE 802.11 wireless and IEEE 802.3 Ethernet.

The access point connects to a switch with a single Ethernet cable. In most business and industrial installations that cable also carries power, so the access point can be mounted on a ceiling, mast or machine without a mains socket nearby. Several access points with the same SSID cover a large building, and clients roam from one to the next as they move.

An access point handles the radio side: channels, transmit power, encryption and which clients are connected. Addressing, routing and internet access stay with the router and the rest of the network.

The two are often confused because most home Wi-Fi routers contain an access point. Inside a business or industrial network they are separate devices with separate jobs.

Access points are sold by Wi-Fi generation, the Wi-Fi Alliance name for each IEEE 802.11 amendment. Headline rates are theoretical maximums across all streams; a single client typically achieves a fraction of them.

Faster generations need faster uplinks and more power. Wi-Fi 6 and 7 access points commonly use 2.5 Gb/s Ethernet uplinks and draw more than the 15.4 W of basic PoE, so the switch port and cabling have to keep up.

Power over Ethernet is the standard way to power access points. IEEE 802.3at (PoE+) delivers up to 30 W at the switch port and covers most Wi-Fi 6 models, while some Wi-Fi 7 access points need IEEE 802.3bt. Size the total PoE budget of industrial PoE switches for every access point and camera on them, with headroom for start-up. Our guide to industrial Power over Ethernet explains power classes and how to budget for them.

Most sites run several SSIDs, such as staff, guest and machine networks, and map each one to its own VLAN on the switch. That keeps guest traffic away from control systems. Our guide to how VLANs segment a network covers the switch side.

Warehouses, factories, ports and depots use Wi-Fi for handheld scanners, vehicle-mounted terminals, AGVs and mobile robots. Industrial access points differ from office models in sealing, often IP67 with M12 or N-type antenna connectors, in wide operating temperatures, and in fast roaming so moving vehicles hand over between access points without dropping a session. Some industrial computers carry a Wi-Fi module that can run as a local access point, letting engineers connect a tablet directly to a machine. Many industrial IoT gateways combine Wi-Fi with 4G or 5G, using the cellular link for backhaul where no wired network reaches.

On buses, trains and service vehicles, an access point on board gives passengers or crew Wi-Fi while a cellular router carries the traffic to the outside world. Our explainer on how multi-SIM routers keep vehicles connected covers that side of the link. Plan coverage with a site survey before installation, because racking, tanks and moving metal change how radio signals travel.

An industrial access point does the same job as an office model but is built for the cabinet, mast or vehicle it is fixed to. When comparing models, these are the points that usually separate them:

We fit Wi-Fi and cellular modules, antennas and cabling in the industrial computers and gateways we supply as standard, and configure each radio for the site before it ships. Send us your coverage area and device list, and we will specify the wireless hardware to match.