DSL or xDSL is a group of digital technologies that allow the transmission of data over the phone. DSL originally stood for digital subscriber loop, but it is now commonly referred to as Digital Subscriber Line. The typical transmission speed of DSL services ranges from 128 kilobits per second to 24,000 kbit / s DSL technology was originally developed as part of the Integrated Services Digital Network (ISDN started). ISDN is a series developed by snoring implementedorder for the digital transmission of voice and data over a standard copper phone line. This has led to a better speed and quality than the old analog system.
Most common forms of DSL
Asymmetric Digital Subscriber Line (ADSL) is a form of DSL, the fastest transmission of data over the same copper wires of a dial-up modem standard permit. This is achieved by the use of frequencies that are normally not by a voice on the phone, usedin particular, frequencies higher than those of human hearing.
The disadvantage is that ADSL is Ony effective on relatively short distances. You must be at 5 km from the telephone company central office. There, the ADSL signal is removed and then immediately routed to a conventional internet network, while a voice in traditional telephone network is connected. This will allow a single telephone line for voice and data are used.
Thefeature of ADSL is that more data on other speeds of more than one way. This is often marketed to small businesses or home users who are more interested in Internet access at an affordable price. Allows a download speed faster, thus reducing the user time to view websites and download files. This is not recommended if you are the need to load large amounts of information or servers that require large amounts ofBandwidth in the opposite direction.
Symmetric Digital Subscriber Line (SDSL) is a variant of DSL that allowed the user to the same speed of data transfer in both directions. This technology is the transmission speed 72-2320 kbit / s. The main disadvantage is that you even closer to Telecom central office. A maximum distance of 3 km and all, what is supported. It is also much more expensive.
Typical DSL technologies are:
HighData Rate Digital Subscriber Line (HDSL), the first DSL technology that the spectrum used to transmit data more frequesncy
Symmetric Digital Subscriber Line (SDSL), a standardized version of HDSL
Asymmetric Digital Subscriber Line (ADSL), a version of DSL with an upload speed
Rate-Adaptive Digital Subscriber Line (RADSL), a variant of ADSL, the upstream speed is obtained the compound in an attempt to a specific downstreamSpeed.
Very-high-bit-rate Digital Subscriber Line (VDSL), an improvement compared to the rapid growth of HDSL transmission rate of offers. He used up to 4 different frequency bands, two for the upstream (client to Telekom) and two for the valley.
Very-high-bit-rate Digital Subscriber Line 2 (VDSL2), an improved version of VDSL-Symmetric High-Speed Digital Subscriber Line (G. SHDSL), a replacement standard for WiMAX SDSL by the International TelecommunicationUnion
Telecommunication Standardization Sector Powerline Digital Subscriber Line (PDSL), high-speed powerline communications solution that provides high-speed data over existing electrical infrastructure for the distribution of modulation
DSL Service offers small business customers access to high speed Internet for a very reasonable price. Many people do not realize that DSL speeds of 1.5 Mbps, the same T1 speed of 1.5 Mbit / s at peak. DSL costs $ 35 per month on averagewhere a full T1 usually costs $ 400 or $ 500 if you are in an underground city and is located up to 1,000 dollars a month if you are in a rural setting. Why the high cost for T1 service without the extra speed? A T1 gives reliable service and is not compatible with other subscribers or oversubscribed, as DSL is shared. Why not a common service that brings a high price.
DSL service offers a slightly 'less reliable at a fraction of the cost. If you already have DSL Service youHave noticed that it's fast at some times and slower at other times. This is because it is sold out. Oversubscription means that many people draw the same resources. What does this mean for you? Slow speeds occasionally in peak hours.
The largest, most users of small businesses' concern is price, which is why DSL Service is so popular among them. Some slow periods are a small price to pay for a reduction of 90%.