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

2016年7月26日 (火) 22:10時点における版

Internet 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 selecting one?
An Internet service provider is often a company that connects one to the Internet, usually for a monthly fee. Most modern ISPs offer either cable or DSL service, though there's also providers offering dial-up, satellite, fiber optic, and cellular connections. (These is going to be discussed in greater detail 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 wire (for cable or fiber optic) company. Satellite television providers offer satellite Internet connections, and cellphone carriers offer cellular Internet connections.

As mentioned earlier on, any local phone company can offer DSL or dial-up Internet connections. Both of these connections are carried within the same lines since your phone calls throughout your property.





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Dial-up connections use what is called a "circuit-switched" link to your ISP -- that is certainly, it remains connected constantly before you close the bond. This appears like a good thing -- all things considered, traditional telephone service is circuit-switched -- but this also means that the queue it uses can't have any other connections while you are on the find internet, each computer that really needs a connection optimally needs to be given a unique line. Though few ISPs actively promote dial-up packages for consumer use due to its slow speeds, they may be still available as well as a good option if you prefer a low-speed, persistent connection, such as for 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, typically known as DSL, runs on the "packet-switched" connection -- which is, your personal computer connects to the Internet by having a DSL connection for too long enough for you or receive information, then drops the link with free it for other computers to work with. This process of acquiring and dropping the text is transparent, since you don't have to do just about anything but surf the Internet for this to work. DSL is faster than dial-up, which range from 128 Kbps to 8 megabits per second, or Mbps. DSL, like its predecessor dial-up, allows for a private connection, which means that the computers on the local network are the only ones that are on your connection all the way on the ISP. However, the bond speed can differ depending around the distance for a ISP. This connection type is better used in a private home or a small to medium business setting.

Cable-based Internet providers vary from phone-based Internet providers in that the Internet signal travels through the copper wire that suffers from your home to provide cable television. Like DSL, this is often a packet-switched connection. Cable is comparable to DSL rolling around in its speeds, even though maximum speed that cable can offer can go all the way to 27 Mbps. One thing which makes cable not the same as DSL, though, is the fact it is normally a shared connection ' which is, everyone locally who is also using cable Internet is applying the same bandwidth from the moment the signal leaves your house to the time it reaches the ISP. Because of this, speeds could possibly be affected by the number of people are about the network at a given time. Cable Internet is mostly best employed in the home, considering that the shared connection can't absolutely guarantee a speed which businesses may depend on.

Satellite Internet services usually are only practical in locations where more common services cannot be deployed. As the name indicates, the service uses clear distinct sight to a satellite orbiting the earth. These connections would be best used by locations are constantly for the move, such as vessels at sea, airplanes in flight, or vehicles moving forward land. Upload speed on a satellite connection is about a tenth with the download speed, which peaks at about 500 Kbps.

Most cellphone carriers offer precisely what are called "aircards", cards that plug into whether PCMCIA / PCMCIA Express slot on the laptop or desktop, or possibly a USB modem that plugs into a USB port on the computer. These devices allow your personal computer to connect to a cellular network, much like your cell phone does. Some carriers also provide plans that allow you to use your mobile phone itself as being a modem for your computer. These carriers offer 3G connection speeds and/or 4G connection speeds. The actual speed itself can vary depending on the number and accessibility to cellular towers in the area you're in when trying in order to connect. Cellular broadband can be a very wise decision for mobile businesspeople and those about the go.

Most large cities have started creating 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 really succeed for police to have information on a vehicle or location, and ambulances and fire services to obtain to locations by finding the optimum routes on interactive maps. When available towards the public, municipal Wi-Fi relies upon hotspots, or areas included in one or more interconnected wireless access points, such as wireless routers. Some of these municipal Wi-Fi networks actually offer high-speed Internet access at little cost in comparison with other, more common broadband providers, or sometimes no cost at all.
WiMAX is surely 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 contain the range of most cell phones, WiMAX can cover regions of up to 3000 square miles and provide speeds similar 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.