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

2016年7月25日 (月) 19:27時点における版

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




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

As mentioned before, any local phone company may offer DSL or dial-up internet service near me connections. Both of these connections are carried on the same lines as your phone calls throughout the house.





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

A digital subscriber line, additionally known as DSL, utilizes a "packet-switched" connection -- which is, your personal computer connects on the Internet through a DSL connection for too long enough for you or receive information, then drops the connection to free it for other computers to utilize. This process of acquiring and dropping the link is transparent, because you don't have to do 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 ensures that the computers on your neighborhood network will be the only ones that are on your connection all the way to the ISP. However, the bond speed can vary depending on the distance in your ISP. This connection type is best used in a private home or a small to medium business setting.

Cable-based Internet providers alter from phone-based Internet providers because the Internet signal travels across the copper wire that incurs your home to provide cable. Like DSL, this can be a packet-switched connection. Cable is similar to DSL rolling around in its speeds, even though the maximum speed that cable can offer can go of up to 27 Mbps. One thing which makes cable distinctive from DSL, though, is the fact it is usually a shared connection ' that is, everyone in your area who is also using cable Internet is employing the same bandwidth from the time the signal leaves your house to the time it reaches the ISP. Because of this, speeds could be affected by what number of people are for the network with a given time. Cable Internet is usually best utilized in the home, since shared connection can't absolutely guarantee a speed which businesses may count on.

Satellite Internet services are often only practical in locations where more traditional services can't be deployed. As the name indicates, the service uses a clear distinct sight to a satellite orbiting the planet earth. These connections would be best used by locations are constantly about the move, for example vessels on the ocean, airplanes in flight, or vehicles moving forward land. Upload speed on the satellite connection is around a tenth from the download speed, which peaks at about 500 Kbps.

Most cellphone carriers offer precisely what are called "aircards", cards that plug into the PCMCIA / PCMCIA Express slot over a laptop or desktop, or even a USB modem that plugs into a USB port with a computer. These devices allow your personal machine to connect to your cellular network, much like your cellphone does. Some carriers offer plans that allow you to use your mobile phone itself like a modem for your personal machine. These carriers offer 3G connection speeds and/or 4G connection speeds. The actual speed itself can vary depending around the number and availability of cellular towers in the region you're in when trying in order to connect. Cellular broadband is often a very great choice for mobile businesspeople and those on the go.

Most large cities have started establishing municipal Wi-Fi connections for either public use and city employees only. Even some smaller cities have these municipal networks build for emergency service use, to make it easier for police to have information with a vehicle or location, and ambulances and fire services to acquire to locations by finding the optimum routes on interactive maps. When available towards the public, municipal Wi-Fi depends on hotspots, or areas covered by one or more interconnected wireless access points, for example wireless routers. Some of these municipal Wi-Fi networks actually offer high-speed Internet access at little cost compared to other, more traditional broadband providers, or sometimes cost-free at all.
WiMAX is 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 phones, WiMAX can cover aspects of up to 3000 square miles and convey speeds much 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.