「What is the Definition of an Internet Service Provider」の版間の差分

2016年7月25日 (月) 20:11時点における版

Internet providers (ISPs) will be in almost every home and office in the modern world. But what exactly is an ISP? What should you look for when selecting one?
An Internet service provider is a company that connects you to the Internet, usually to get a monthly fee. Most modern ISPs offer either cable or DSL service, though there are also providers offering dial-up, satellite, fiber optic, and cellular connections. (These is going to be discussed in more detail in later sections.)




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Usually, Internet connections can be purchased at the least expense from your local phone (for dial-up or DSL) or cable (for cable or fiber optic) company. Satellite television providers offer satellite Internet connections, and cellular phone carriers offer cellular Internet connections.

As mentioned before, your local phone company can offer DSL or dial-up Internet connections. Both of these connections are carried over the same lines because your phone calls throughout the house.





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Dial-up connections use what's called a "circuit-switched" link with your ISP -- that is, it remains connected constantly before you close the connection. This feels like a good thing -- all things considered, traditional telephone service is circuit-switched -- but and also this means that the fishing line it uses can't receive any other connections as long as you're on the Internet, and each computer that needs a connection optimally must be given its own line. Though few ISPs actively promote dial-up packages for consumer use because slow speeds, these are still available plus a good option prefer a low-speed, persistent connection, such as for the credit card line. The connection speed maximum as defined by the IEEE is 56 kilobits per second, or 56 Kbps.

A digital subscriber line, more commonly known as DSL, uses a "packet-switched" connection -- that is, your pc connects towards the find internet by having a DSL connection for very long enough for you or receive information, then drops the link to free it for other computers to work with. This process of acquiring and dropping the connection is transparent, as you don't have to do just about anything but surf the Internet for this to work. DSL is faster than dial-up, including 128 Kbps to 8 megabits per second, or Mbps. DSL, like its predecessor dial-up, allows for any private connection, which signifies that the computers on your neighborhood network include the only ones that are in your connection all the way towards the ISP. However, the bond speed can vary depending on the distance for your ISP. This connection type is best used in a personal home or possibly a small to medium business setting.

Cable-based Internet providers alter from phone-based Internet providers because the Internet signal travels over the copper wire that happens upon your home to provide cable tv. Like DSL, this can be a packet-switched connection. Cable is similar to DSL in the speeds, although maximum speed that cable can provide can go as high as 27 Mbps. One thing that creates cable not the same as DSL, though, is always that it is usually a shared connection ' that is certainly, everyone in your town who is also using cable Internet is employing the same bandwidth when the signal leaves your property to the time it reaches the ISP. Because of this, speeds might be affected by how many people are around the network with a given time. Cable Internet is usually best found in the home, since shared connection can't absolutely guarantee a speed which businesses may depend on.

Satellite Internet services are usually only practical in locations where more common services is not deployed. As the name indicates, the service relies on a clear line of sight with a satellite orbiting the earth. These connections would be better used by locations where are constantly about the move, such as vessels cruising, airplanes flying, or vehicles shifting land. Upload speed over a satellite connection is approximately a tenth of the download speed, which peaks at about 500 Kbps.

Most mobile phone carriers offer what are called "aircards", cards that plug into either a PCMCIA / PCMCIA Express slot on a laptop or desktop, or perhaps a USB modem that plugs into a USB port on a computer. These devices allow your personal machine to connect to your cellular network, much like your mobile phone does. Some carriers also offer plans that allow you to definitely use your cellular phone itself being a modem for your personal machine. These carriers offer 3G connection speeds and/or 4G connection speeds. The actual speed itself may vary depending about the number and use of cellular towers in the region you're in when trying for connecting. Cellular broadband can be a very great option for mobile businesspeople and those for the go.

Most large cities have started establishing municipal Wi-Fi connections for either public use or for city employees only. Even some smaller cities have these municipal networks create for emergency service use, to really succeed for police to acquire information over a vehicle or location, and ambulances and fire services to have to locations by finding the best routes on interactive maps. When available to the public, municipal Wi-Fi depends on hotspots, or areas covered by one or more interconnected wireless access points, like wireless routers. Some of these municipal Wi-Fi networks actually offer high-speed Internet access at little cost compared to other, classical broadband providers, or sometimes no cost at all.
WiMAX is definitely an emerging telecommunications technology directed at providing interconnectivity over longer distances than other types of wireless connection types. While traditional wireless routers in a municipal network hold the range of most mobile phones, WiMAX can cover areas of up to 3000 square miles and provide speeds just like DSL or cable.

Vachon, Bob and Rick Grazini. "Accessing the WAN, CCNA Exploration Companion Guide." Ch 6, pp 384-401.
Other information from author's own knowledge and experience.
Images copyright Creative Commons.