Wireless network

Computers can talk without wires.

They use invisible waves in the air. This helps us use phones anywhere.

These waves move data from place to place. It is easier than using long cables.

You can use these networks at home. You can also use them at work.

Some networks work in a small area. These are called local networks. They help devices talk nearby.

Other networks cover very large areas. They can reach between towns. Some use satellites in space.

Wireless networks make life easier. We use them to share things fast. Do you use one today?

Computers can talk without using any cables.

They use invisible waves to send data. This is called a wireless network. These networks help us save money. We do not have to put wires in walls.

Some networks cover a small area. A wireless local area network, or WLAN, links devices nearby. You might use one at home. Many people use Wi-Fi to connect to the internet.

You can move around and stay connected.

Other networks cover huge areas. A wireless wide area network can reach between towns. These often use microwave links. These links use dishes to send signals in a straight line.

Cellular networks are also very common. They divide land into small areas called cells. Each cell has a base station. This station helps your phone talk to the network. As you move, your call moves from cell to cell. This keeps you connected while you travel. Some networks even use satellites in space. These satellites send signals down to Earth. They help us talk across the whole world.

A wireless network is a way for computers to talk without using any cables.

Instead of wires, these networks use invisible data connections between different points. This is very helpful for homes and big businesses. It allows them to avoid the hard job of installing many expensive cables into buildings. Different types of networks exist for different needs. Some are small, while others cover entire cities or even the whole world.

These connections make it much easier to link equipment in different locations.

Wireless networks work by sending signals through the air using radio waves.

One common way is through a wireless local area network, or WLAN. This links devices over a short distance using an access point. Many people know this technology by the brand name Wi-Fi. Another way is through cellular networks. These divide a large area into smaller parts called cells. Each cell has its own base station to help relay signals. As you move from one area to another, the network hands your connection off to the next cell. This keeps your call or data flowing smoothly.

People have been building these networks for a long time. The first professional wireless network was called ALOHAnet. It was developed at the University of Hawaii in 1969. This network became operational in June 1971. Later, the first commercial wireless network arrived in 1986. It was called the WaveLAN product family and was made by a company named NCR. In 1997, the first version of the Wi-Fi protocol was released. Since then, technology has moved from 2G to 3G, 4G, and even 5G. These new generations allow us to send much more data much faster.

Many different parts and numbers make these networks work.

Engineers use special tools called MOSFETs to build parts like routers and mobile transceivers. These tiny parts help manage the digital signals. Some networks use microwave links that work in the low gigahertz range. These links must have a clear line-of-sight to work. Other networks use satellites stationed in space. These satellites are often in a geosynchronous orbit above the equator. They can receive and send voice, data, and TV signals across the planet. Even space networks exist to help spacecraft talk to each other near Earth.

Wireless technology is part of almost everything we do today.

You might use a wireless personal area network, or WPAN, to connect a headset to a laptop. This uses technologies like Bluetooth or infrared light. We also use wireless networks for emergency services like the police. They help officers communicate effectively when they are working. Businesses use them to share data quickly across an office or a whole city. Whether it is a small device in your hand or a huge satellite in space, wireless networks keep our world connected.

A wireless network is a computer network that uses wireless data connections between network nodes.

These networks allow homes, businesses, and telecommunications systems to function without physical cables. Installing cables into buildings can be a very expensive and difficult process. Wireless technology solves this by using radio communication at the physical layer of the OSI model. This model is a structure used to describe how different parts of a network work together. By using invisible signals, devices can connect across rooms, cities, or even the entire planet.

Modern wireless technology relies heavily on advances in semiconductor physics. Specifically, the development of MOSFET, or metal-oxide-semiconductor field-effect transistor, technology enabled digital wireless networks. These tiny components are the building blocks for many essential parts of a network. They are used to build mobile transceivers, base station modules, and routers. They also make up RF power amplifiers and telecommunication circuits. As MOSFET technology improved, it led to increased bandwidth, which is the amount of data that can be sent. This progression is often referred to as Edholm's law.

Wireless networks are categorized by the geographic area they cover. A Wireless Personal Area Network, or WPAN, connects devices within a person's immediate reach. Examples include using Bluetooth or infrared light to connect a headset to a laptop. A Wireless Local Area Network, or WLAN, links devices over a short distance. These often use an access point to provide internet access. Many products using the IEEE 802.11 standard are marketed under the brand name Wi-Fi.

For larger areas, there are Wireless Metropolitan Area Networks, known as MANs. These connect several local networks together, such as through the WiMAX standard.

On an even larger scale, Wireless Wide Area Networks, or WANs, cover regions between towns or cities. These often use point-to-point microwave links with parabolic dishes. These dishes operate on the 2.4 GHz and 5.8 GHz bands. For global connectivity, a Global Area Network, or GAN, supports users across many different satellite and LAN areas. The biggest challenge in these large networks is the "handoff." This is the process of moving a user's communication from one local coverage area to the next without losing the connection.

Cellular networks are a specific type of radio network distributed over land areas called cells.

Each cell is served by a fixed-location transceiver called a base station or cell site. To prevent interference, each cell uses a different set of radio frequencies from its immediate neighbors. This method is known as frequency reuse. As a person moves through the network, their device communicates with different base stations. This allows mobile phones and pagers to stay connected while traveling. Modern cellular systems have evolved through several generations, including 2G, 3G, 4G, and 5G.

Wireless communication also happens far above the Earth using satellites. These satellites are typically stationed in geosynchronous orbit above the equator. They communicate using microwave radio waves, which are not deflected by the Earth's atmosphere. These systems can receive and relay voice, data, and TV signals globally. There are also terrestrial microwave networks that use Earth-based transmitters. These look like satellite dishes and operate in the low gigahertz range. Because of how these waves travel, they require a clear line-of-sight between the transmitter and the receiver.

History shows how rapidly this technology has grown. The first professional wireless network was ALOHAnet, developed at the University of Hawaii in 1969. It became operational in June 1971. The first commercial wireless network was the WaveLAN product family, created by NCR in 1986. In June 1997, the first version of the 802.11 Wi-Fi protocol was released. Today, 4G LTE networks provide data speeds that are roughly 10 times faster than 3G networks. From small Bluetooth connections to massive space networks, wireless technology continues to expand our ability to share information.