Nowadays TV package deals that combine digital television services with the internet are becoming popular. One reason for this is that is save money, and another is that with digital TV the differentiation between TV and the internet is become more fuzzy, for instance many TV services are provided over the internet.
These services are provided either by cable or satellite. When TV is received by satellite, internet access is provided over a standard copper telephone line, though when TV is received by fibre optic cable, internet access can also be provided via the fibre optic cable network. The advantage is the latter is improved speeds and quality of service.
Independent of the way that internet services are provided, the hardware that interfaces with either the telephone line or the optical cable network is called a router, and it is the router that connects every device on the network to each other and to the internet.
In the early days of home networks and the internet it was necessary for all the computers in the network to be linked by cables. This was awkward to say the least, and not very versatile. Then along came wireless internet or Wi-Fi as it is generally called, and all those cables suddenly became unnecessary.
The router communicates with every device in the network (for instance desktop computers, printers, scanners, laptops, tablet computers, game consoles, and smartphones), via radio signals. The frequency of the radio waves is such that it is possible for devices to communicate even through walls and ceilings. Typically Wi-Fi has a maximum range of around 30 meters, though the signal is attenuated when it has to pass through walls, which can reduce the range.
Although Wi-Fi is reasonably secure, it is not totally so. In its early days security relied on an encryption standard called WEP or wired equivalent privacy, however it failed to live up to its name and it proved possible to determine the encryption key by eavesdropping on the network. Security was improved by the introduction of WPA and WPA2, though WPA is no longer considered to be secure.
When you use a wireless router it is important that you set up the security properly. Some routers allow you to change the password, whilst others have a password that is set by the internet supplier. Never use a wireless router that is not password protected.
