Technology has advanced greatly in recent years, along with the needs of Internet connection speed. The more applications that require transmission of images, voice or video available on the market, the more the capacity requirement data transmission through networks that recruit. Some of the connection types most popular Internet, along with a basic explanation for each.
Analog connection or dial-up connection
These are the connections that are made through a modem connected to your computer and make use of the telephone line, using a telephone number provided by the ISP (ISP). Some computers have built-in modem, and all you need is a phone cable.
It is called analog connection because the transmission over the phone line is digital and the modem is used to convert from one format to another. The bandwidth that can be achieved in dial-up connections ranges from 2400 bps to 56 Kbps.
It is also known as dial-up (in English).
integrated services digital network (ISDN)
The integrated services digital network (ISDN, or ISDN, by stands for Integrated Services Digital Network) is a communications standard for sending voice, video and data using digital or conventional telephone lines. The bandwidth that can be achieved in this standard typically ranges from 64 Kbps to 128 Kbps.
The digital network of integrated broadband services (B-ISDN or B-ISDN, by stands for Broadband Integrated Services Digital Network) is similar to ISDN with the difference that the transmission is performed using a digital medium, such as optical fiber instead of using telephone lines.
DSL and ADSL
DSL stands for Digital Subscriber Line (in Spanish, digital subscriber line), and refers to a set of technologies that enables Internet access using digital data over telephone networks, allowing simultaneous use with phone conversations. The bandwidth that can be achieved in this standard typically ranges from 256 Kbps to 40 Mbps.
Usually it required to use a modem on the client side, which is commonly known as DSL modem (DSL modem).
DSL is used equally to refer to ADSL, which stands for Asymmetric Digital Subscriber Line (in Spanish, asymmetric digital subscriber line). The difference with DSL, and the reason why it is called asymmetric, is that the ability to download (download) and upload (upload) data are not equal.
Basically ADSL2 + (or ADSL + 2) is a standard that extends the ability of ADSL by doubling the discharge capacity. The data transmission rate of this standard can reach 24 Mbit / s in discharge, and up to 1.4 Mbit / s uphill.
SDSL is a standard based on DSL, with the difference that SDLS offering bandwidth is symmetrical, which means that the download speed (download) is equal to the upload speed (upload) data. Hence SDSL stands for Symmetric are Digital Subscriber Line (in Spanish, symmetrical digital subscriber line).
In the Internet world this type of connection is called Internet access. It is the Internet that is made by cable television infrastructure. It can be said that the Internet connection is cable to cable television what is a DSL connection to the telephone line. Like DLS, it requires a client-side modem, which is known as a cable modem (cable modem). In configurations of cable Internet in residential areas, it is very common to find that the bandwidth is shared by groups of users.
The rates for this type of connection can be up to 20 Mbps for upload (upload), and up to 100 Mbps for download (download).
The wireless Internet connections are carried out by radio frequency connections made. To use this service, the customer must be within the coverage areas of the network, which is usually offered in big cities only. Not to be confused with Wi-Fi points. To use wireless antennas point to the transmission towers used service.
T-1 and T-3
T-1 and T-3 are terms that apply to Internet connections that are made by dedicated circuits leased for this purpose and operating in copper lines or fiber optics. A T-1 line consists of 24 individual channels, and allow utility companies to hire one or more of these channels (each channel can be configured to carry voice or data), what is called fractional T-1 line.
It is common grouping more than one T-1 to increase the transmission capacity. A grouping of two or more T-1 are known as Bonded T-1.
It is called T-3 to a grouping of 28 T-1, resulting in 672 channels available (24 x 28). In a typical line T-1 bandwidth is 1.544 Mbps, and a T-3 becomes of 44.736 Mbps. The T-3 lines are commonly used by ISPs (ISP).
OC, OC-3, OC-12 and similar
OC stands for Optical Carrier and is used to refer to the specification of optical fiber transmission. these acronyms are usually used together with an integer, for example OC-3; the integer is a multiplier of the base unit transmission rate is 51.84 Mbps, which means that a OC-3 line will have a transmission rate of 155.52 Mbps. may be OC-12, OC-24, OC -48, OC-192, OC-768. To learn more about fiber networks (also known as SONET or SDH), you can see this introductory article to SONET (in English).
Satellite Internet is a service that is most commonly used where other means of connection are not available. This type of service have less bandwidth than cable or DLS, plus there is a high latency in data transmission between the satellite and ground stations, which makes it a poor experience for users in some cases, online games and some applications of communications through Internet.
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