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The internet and connectivity: WANs, IoT and bandwidth
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- 1The internet is a global network of computers that any computer can join. It is a WAN - which is a series of connected LAN(s).Web browser
A web browser is a piece of software that enables the user to access web pages and web apps on the internet. There are a range of browsers available, and they are usually free to download and install. - 2The 'internet of things' is the concept of networking lots of devices so that they can collect and transmit data. The idea that any object or living being can be uniquely identified on the internet is central to the concept. By automating the capture of information, greater quantities of it can be stored and processed.Fibre optic cabling is made from glass that becomes very flexible when it is thin. Light is passed through the cable using a transmitter. Light travels quickly through the light-reflecting internal wall of the cable.
The transmitter in the router sends light pulses representing the binary code. When the data is received, it is decoded back to its binary form and the computer displays the message. - 3The internet is transmitted both on physical wires and wireless connections. Broadband internet is transmitted on physical wires that run underground and under the oceans. Download speeds tend to be faster than upload speeds. More bandwidth is assigned for downloading because there is a higher demand for downloads. Network speeds are measured by how many megabits they can download per second (Mbps).Cable
Cable companies do not use traditional telephone lines to provide broadband internet access. They have their own network which is a combination of co-axial copper cable and fiber optic cable. Copper wires connect a house to the nearest connection point - usually a green cabinet in a nearby road. From there, the cables to the telephone exchange will be fiber optic.
With their purpose-built infrastructure, cable companies are able to provide speeds of up to 200 Mbps - considerably faster than the highest available ADSL speed (24 Mbps).
A cable modem or router is needed for broadband internet access over cable. This is usually provided by the ISP.
The making and receiving of phone calls are not affected because the telephone line is not used.
3G and 4G
The wireless 3G and 4G networks can be accessed through a smartphone without the need for a WiFi router. The data is transmitted through the cellular phone network rather than the physically cabled network of broadband. This enables anyone to connect to the internet as long as there is a 3G or 4G connection available. - 4Bandwidth (signal processing) or analog bandwidth, frequency bandwidth or radio bandwidth, a measure of the width of a range of frequencies, measured in Hertz. Bandwidth (computing), the rate of data transfer, bit rate or throughput, measured in bits per second (bit/s)
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- Fichas sobre Sin título, creado por callum broomfield el 20/11/2018.
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