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

2016年7月25日 (月) 15:16時点における版

Internet providers (ISPs) have been in almost every home and office in the modern world. But exactly what is an ISP? What in case you look for when choosing one?
An Internet service provider is a company that connects that you the Internet, usually for the 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 will be discussed in depth in later sections.)




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

As mentioned before, your local phone company may offer DSL or dial-up Internet connections. Both of these connections are carried within the same lines as the phone calls throughout your home.





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Dial-up connections use what is known as a "circuit-switched" link to your ISP -- which is, it remains connected constantly and soon you close the bond. This sounds like a good thing -- in fact, traditional telephone service is circuit-switched -- but this also means that the fishing line it uses can't have any other connections as long as you're on the Internet, and every computer that has to have a connection optimally should be given a unique line. Though few ISPs actively promote dial-up packages for consumer use due to its slow speeds, these are still available plus a good option if you prefer a low-speed, persistent connection, such as to get a credit card line. The connection speed maximum as defined by the IEEE is 56 kilobits per second, or 56 Kbps.

A digital subscriber line, also known as DSL, utilizes a "packet-switched" connection -- which is, your pc connects to the Internet via a DSL connection for long enough for you or receive information, then drops the link to free up for other computers to work with. This process of acquiring and dropping the link is transparent, because you don't have to do anything whatsoever 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 to get a private connection, which implies that the computers on any local network will be the only ones that are on your own connection all the way for the ISP. However, the link speed may vary depending about the distance to your ISP. This connection type is best used in an exclusive home or even a small to medium business setting.

Cable-based Internet providers alter from phone-based Internet providers in this the Internet signal travels throughout the copper wire that suffers from your home to provide wire. Like DSL, this is really a packet-switched connection. Cable is comparable to DSL in their speeds, although maximum speed that cable can provide can go up to 27 Mbps. One thing that produces cable different from DSL, though, is always that it is mostly a shared connection ' which is, everyone in your area who is also using cable Internet is using the same bandwidth from the time the signal leaves your property to the time it reaches the ISP. Because of this, speeds could possibly be affected by the number of people are for the network with a given time. Cable Internet is generally best used in the home, considering that the shared connection can't absolutely guarantee a speed which businesses may depend on.

Satellite Internet services are usually only practical in locations where some services can't be deployed. As the name indicates, the service uses clear distinct sight to your satellite orbiting the planet earth. These connections might be best used by places where are constantly on the move, for example vessels on the ocean, airplanes during flight, or vehicles shifting land. Upload speed with a satellite connection is about a tenth in the download speed, which peaks at about 500 Kbps.

Most cellular phone carriers offer what exactly 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 over a computer. These devices allow your personal computer to connect to some cellular network, much like your mobile phone does. Some carriers offer plans that allow you to definitely use your cellphone itself being a modem for your pc. These carriers offer 3G connection speeds and/or 4G connection speeds. The actual speed itself may vary depending around the number and option of cellular towers in your neighborhood you're in when trying in order to connect. Cellular broadband is a very good option for mobile businesspeople and those around the go.

Most large cities have started creating municipal Wi-Fi connections for either public use or for city employees only. Even some smaller cities have these municipal networks setup for emergency service use, to learn effectively for police to have information with a vehicle or location, and ambulances and fire services to have to locations by locating the optimal routes on interactive maps. When available to the public, municipal Wi-Fi relies upon hotspots, or areas protected by one or more interconnected wireless access points, search for broadband example wireless routers. Some of these municipal Wi-Fi networks actually offer high-speed Internet access at little cost when compared with other, classical broadband providers, or sometimes zero cost at all.
WiMAX is surely an emerging telecommunications technology geared towards providing interconnectivity over longer distances than other types of wireless connection types. While traditional routers in a municipal network have the range of most phones, WiMAX can cover parts of up to 3000 square miles and bring speeds comparable to 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.