Today we will be discussing more on wireless networks
Network connections can be established wirelessly using radio or other electromagnetic means of communication.
There are few types of wireless technologies which we use in our day-to-day life:
- Terrestrial Microwave– Terrestrial microwave communication uses Earth-based transmitters and receivers resembling satellite dishes. Terrestrial microwaves are in the low gigahertz range, which limits all communications to line-of-sight. Relay stations are spaced approximately 40 miles (64 km) apart.
- Communication Satellites – Satellites communicate also communicate via microwave. The satellites are stationed in space, typically in geosynchronous orbit 35,400 km (22,000 mi) above the equator. These Earth-orbiting systems are capable of receiving and relaying voice, data, and TV signals.
- Cellular Networks - use several radio communications technologies. The systems divide the region covered into multiple geographic areas. Each area is served by a low-power transceiver.
- Radio and spread spectrum technologies – Wireless LANs use a high-frequency radio technology similar to digital cellular. Wireless LANs use spread spectrum technology to enable communication between multiple devices in a limited area. IEEE 802.11 defines a common flavor of open-standards wireless radio-wave technology known as Wi-Fi.
- Free Space Optical Transmission - uses visible or invisible light for communications. In most cases, line of sight propagation is used, which limits the physical positioning of communicating devices.
- Wi-Fi - especially popular in home networks and as Wireless technology.
- Bluetooth - for low-power and embedded applications.
- Mobile Networks - 5G, 4G, and 3G cellular internet.
- Wireless Home Automation - standards like Zig-Bee and Z-wave.