Access point
An access point is a network device that creates a wireless Wi-Fi network and connects laptops, smartphones and other devices to it. It converts wired network traffic into a radio signal and back, providing mobile access in offices, homes and facilities.
An access point is a network device that creates a wireless Wi-Fi network and connects laptops, smartphones and other devices to it. It converts wired network traffic into a radio signal and back, providing mobile access in offices, homes and facilities.
What is an access point
An access point (Access Point, AP) is a device operating at the second layer of the OSI model and serving as a bridge between a wired local network and wireless Wi-Fi clients. It connects to a switch with twisted pair (often with PoE power) and broadcasts the network within its range. An access point should be distinguished from a router: a router hands out IP addresses, NAT and internet access, while an access point only extends an existing network by adding wireless connections. Modern access points support Wi-Fi 6 (802.11ax) and Wi-Fi 6E standards, 2.4 and 5 GHz bands, allow connecting dozens and hundreds of clients, support VLAN, guest networks, PoE management and centralized control through a controller.
Types and applications
Several types are distinguished by purpose. Home access points — often built into a router, create one network for an apartment. Office access points — mounted on ceilings or walls, powered via PoE, cover a cabinet or floor area; for large premises, networks of several APs with a controller and seamless roaming are built. Outdoor access points — protected from moisture and temperature, used in warehouses, factories and territories. Industrial access points — operate in harsh conditions and support terminal connections. For access control systems, video surveillance and remote access to workstations, Wi-Fi allows connecting devices without running cable, and roaming technologies provide an uninterrupted connection when moving between coverage areas.
How to build a wireless network
Wi-Fi network design starts with a site survey: the area, the number of employees and the devices that need connection are determined. To cover a floor, several access points are usually placed, which connect to a switch over twisted pair with PoE power. Neighboring points are set to different, non-overlapping channels, and fast roaming (802.11r/k/v) is used for seamless transitions between areas so that calls and video conferences do not drop when moving. Security is provided by WPA3 encryption, a separate guest network with client isolation, MAC address filtering and a centralized controller that collects statistics and manages all points. After installation, a coverage survey is performed and placement is adjusted to eliminate “dead zones”.
The number of access points is calculated based on client density and room type: for open space, one point covers a large area; for rooms with partitions, more are needed. The load is assessed in the context of applications: video surveillance and video conferencing take up most of the channel, so dedicated points or separate SSIDs with traffic priority are planned for such systems.
Frequently asked questions
What is a Wi-Fi access point?
An access point (AP) is a device that creates a wireless Wi-Fi network and connects clients to it. It connects by cable to a switch and broadcasts the network over the radio, allowing laptops and smartphones to work without wires.
How is an access point different from a router?
A router hands out IP addresses, performs NAT and provides internet access. An access point only adds wireless access to an existing network, without doing routing. A home router combines both a router and an access point.
How many devices can an access point handle?
Modern Wi-Fi 6 access points support from 50 to 200 clients depending on the model and load. With a large number of devices and high speed requirements, a network of several APs with a controller is built.
What is Wi-Fi roaming and why is it needed?
Roaming is a technology where a client automatically switches between access points without dropping the connection when moving around a building. The controller coordinates the APs, and a video call or work session is not interrupted.
What is PoE on an access point?
PoE is powering a device over a network cable. An access point receives power and data over one twisted pair, which simplifies mounting on a ceiling or wall and does not require a separate outlet at the installation point.
How to build a wireless network in an office?
A radio survey is conducted to calculate the number of access points, they are mounted on the ceiling with PoE power, connected to switches and configured with a single SSID with roaming through a controller. Guest traffic is isolated via VLAN and limited.
What Wi-Fi standards are there?
Wi-Fi 5 (802.11ac) — up to 3.5 Gbps at 5 GHz; Wi-Fi 6 (802.11ax) — higher speed, better performance in dense environments and lower latency; Wi-Fi 6E — adds the 6 GHz band. The choice of standard determines the speed and capacity of the network.
Do I need an access point at home?
If the apartment is large or the walls weaken the signal of the built-in router, a separate access point or a mesh system provides stable coverage. The access point is connected by cable to the router and creates an additional Wi-Fi zone.
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Access point
An access point is a network device that creates a wireless Wi-Fi network and connects laptops, smartphones and other devices to it. It converts wired network traffic into a radio signal and back, providing mobile access in offices, homes and facilities.
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