Computer Networking -Wireless Networks Digital wireless communication is not a new idea. Earlier, Morse code was used to implement wireless networks. Modern digital wireless systems have better performance, but the basic idea is the same. Wireless Networks can be divided into three main categories:
1. System interconnection
2. Wireless LANs
3. Wireless WANs
System interconnection is all about interconnecting the components of a computer using short-range radio. Some companies got together to design a short-range wireless network called Bluetooth to connect various components such as monitor, keyboard, mouse and printer, to the main unit, without wires.
Bluetooth also allows digital cameras, headsets, scanners and other devices to connect to a computer by merely being brought within range. In simplest form, system interconnection networks use the master-slave concept. The system unit is normally the master, talking to the mouse, keyboard, etc. as slaves.
These are the systems in which every computer has a radio modem and antenna with which it can communicate with other systems. Wireless LANs are becoming increasingly common in small offices and homes, where installing Ethernet is considered too much trouble. There is a standard for wireless LANs called IEEE 802.11, which most systems implement and which is becoming very widespread.
The radio network used for cellular telephones is an example of a low-bandwidth wireless WAN. This system has already gone through three generations.
• The first generation was analog and for voice only.
• The second generation was digital and for voice only.
• The third generation is digital and is for both voice and data.
Inter Network or Internet is a combination of two or more networks. Inter network can be formed by joining two or more individual networks by means of various devices such as routers, gateways and bridges.