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DSL Info - What is DSL?
DSL is an acronym for Digital Subscriber Line. This is a type of broadband Internet connection that allows web surfers to navigate the Internet several times faster than dial-up.
It has a high speed frequency that is more than 10 times faster than dial-up connection. This kind of technology also uses telephone lines to get connected and to bring information of high bandwidth to consumers and to businessmen.
A DSL Internet connection is usually accompanied with a modemOrdinary modems provide you with the maximum amount of 56 Kbps in terms of data exchange, lower to ISDN which can give up to 128 Kbps. This is because the telephone company requires your computer to change the analog signals into digital signals first producing a low bandwidth. With DSL however, the digital data is passed on directly to your computer as digital data, thereby producing a higher bandwidth and allowing higher Kbps rates that may even be higher than ISDN and even cable.
A DSL line can accommodate voice signals as well as data signals It allows users to use both the telephone and the Internet at the same time, unlike dial-up connection in which either one cannot be used if the other is being utilized.
DSL actually started in the year 1998 and has had a continuous increase in the number of connections in many parts of the world. The big companies such as Intel, Microsoft, and Compaq have come up with G. Lite, which is a type of ADSL that is easier to install and is described to be accelerating deployment.
How does DSL Works?
The Technology Behind DSL
The technology behind DSL (Digital Subscriber Lines) works by connecting users to a main broadband DSL access multiplexer.
It sends signal from the customers DSL to a network which in return connects the users or subscribers to the internet. It has the ability to compresstransformed into graphics, text and other form of information which are then transferred at high speed rates to computers across the world.
And since DSL is a technology that is ever evolving and developing that includes the technology of fibre optic cable, cable modems, Wi-FI, WLAN - consumers can be sure to get better service than we do today. This is not to say than the present broadband technology is not exemplary; the fact is that it is. As a consumer who uses and depends a lot on the internet, there is no other satisfactory alternative to high speed and reliable broadband DSL.
Types of DSL: ADSL and SDSL
two types of DSL: Asymmetric DSL and Symmetric DSL.
Symmetric DSL (SDSL)
This type of DSL connection have equal bandwidth for upstream and downstream activities. Symmetric DSL connections are more popularly used in business because they have higher requirements or needs when it comes to data transfers as compared to home Internet users. Normally, Symmetric DSL can offer up to 1.5 Mbps both for download and upload. Examples of Symmetric DSL are: HDSL, SDSL/G-Lite and SHDSL .
ISDN DSL or IDSL
Another type of DSL Internet Service is the so called IDSL which is actually a hybrid DSL (ISDN technology) that was designed at the same time when the other forms of DSL Internet technologies were made. IDSL however is not used that much because of the low speeds that it offers, actually only a maximum of 128 Kbps.
DSL is an acronym for Digital Subscriber Line. This is a type of broadband Internet connection that allows web surfers to navigate the Internet several times faster than dial-up.
A DSL Internet connection is usually accompanied with a modemOrdinary modems provide you with the maximum amount of 56 Kbps in terms of data exchange, lower to ISDN which can give up to 128 Kbps. This is because the telephone company requires your computer to change the analog signals into digital signals first producing a low bandwidth. With DSL however, the digital data is passed on directly to your computer as digital data, thereby producing a higher bandwidth and allowing higher Kbps rates that may even be higher than ISDN and even cable.
A DSL line can accommodate voice signals as well as data signals It allows users to use both the telephone and the Internet at the same time, unlike dial-up connection in which either one cannot be used if the other is being utilized.
DSL actually started in the year 1998 and has had a continuous increase in the number of connections in many parts of the world. The big companies such as Intel, Microsoft, and Compaq have come up with G. Lite, which is a type of ADSL that is easier to install and is described to be accelerating deployment.
How does DSL Works?
Howcopper wire. These telephone copper wires have extensive space, and it can carry more than your telephone conversation. It has a large bandwidth, or a range of frequencies, than that is required for a voice telephone call. DSL then makes use of these spaces to bring information visible on the line without disturbing the conversations on the telephone. The complete plan of DSL is just to match specific frequencies to tasks at hand.
Telephone Service. Traditional phone service was created to let you exchange voice information with other phone users and the type of signal used for this kind of transmission is called an analog signal. One of the ways in which the POTS works is to actually limit the frequency of what a phone conversation can carry over the wire. A normal telephone conversation has a frequency range between 0-3,400 hertz, which is a very small portion of the range of frequencies. There are some phone lines which actually carry several million hertz, as compared to a normal phone conversation. By having such a tiny small space in the copper wire, the telephone system can actually squeeze in other range of frequencies without having to worry about disrupting the flow of conversation.
This is where the Digital Subscriber Line (DSL) connection comes in, as the equipment can send more digital rather than analog data, and this can actually maximize the power of the phone line. DSL is a technology that assumes digital data does not require change into analog form and back. Digital data is transmitted to your computer directly as digital data and this allows the phone company to use a much wider bandwidth for transmitting it to you. Meanwhile, if you choose, the signal can be separated so that some of the bandwidth is used to transmit an analog signal so that you can use your telephone and computer on the same line and at the same time.
Knowing how a DSL connection works makes you treasure indeed that you have a one-of-a kind system in your phone line.
The Technology Behind DSL
The technology behind DSL (Digital Subscriber Lines) works by connecting users to a main broadband DSL access multiplexer.
And since DSL is a technology that is ever evolving and developing that includes the technology of fibre optic cable, cable modems, Wi-FI, WLAN - consumers can be sure to get better service than we do today. This is not to say than the present broadband technology is not exemplary; the fact is that it is. As a consumer who uses and depends a lot on the internet, there is no other satisfactory alternative to high speed and reliable broadband DSL.
Types of DSL: ADSL and SDSL
two types of DSL: Asymmetric DSL and Symmetric DSL.
Asymmetric DSL (ADSL)
This type of DSL connection gives the consumer more bandwidth when it comes to downloading as compared to uploading. Because of the reduced upload rate, Internet service providers are able to offer greater bandwidth in terms of downloading. This technology is best used by residential customers since they normally use more bandwidth for downloading. The normal rate for downloading is at 5 Mbps and 1 Mbps when uploading. Examples of Asymmetric DSL are: RADSL, VDSL and ADSL/G.Lite. - RADSL (Rate-Adaptive DSL) - is an ADSL technology from Westell in which software is able to determine the rate at which signals can be transmitted on a given customer phone line and adjust the delivery rate accordingly. Westell's FlexCap2 system uses RADSL to deliver from 640 Kbps to 2.2 Mbps downstream and from 272 Kbps to 1.088 Mbps upstream over an existing line.
- VDSL (Very high data rate DSL) - is a developing technology that promises much higher data rates over relatively short distances (between 51 and 55 Mbps over lines up to 1,000 feet or 300 meters in length). It's envisioned that VDSL may emerge somewhat after ADSL is widely deployed and co-exist with it. The transmission technology (CAP, DMT, or other) and its effectiveness in some environments are not yet determined. A number of standards organizations are working on it.
Symmetric DSL (SDSL)
This type of DSL connection have equal bandwidth for upstream and downstream activities. Symmetric DSL connections are more popularly used in business because they have higher requirements or needs when it comes to data transfers as compared to home Internet users. Normally, Symmetric DSL can offer up to 1.5 Mbps both for download and upload. Examples of Symmetric DSL are: HDSL, SDSL/G-Lite and SHDSL .
- HDSL (High bit-rate DSL) - is the earliest variation of DSL to be used for wideband digital transmission within a corporate site and between the telephone company and a customer. The main characteristic of HDSL is that it is symmetrical: an equal amount of bandwidth is available in both directions. For this reason, the maximum data rate is lower than for ADSL. HDSL can carry as much on a single wire of twisted-pair as can be carried on a T1 line in North America or an E1 line in Europe (2,320 Kbps).
- UDSL (Unidirectional DSL) - is a proposal from a European company. It's a unidirectional version of HDSL.
- SDSL (Single-line DSL) - is apparently the same thing as HDSL with a single line, carrying 1.544 Mbps (U.S. and Canada) or 2.048 Mbps (Europe) each direction on a duplex line. It is considered to be the "business grade" DSL because of its symmetric speeds. SDSL is slower than ADSL but usually marketed with Service Level Agreement (SLA) such as the network will be guaranteed up for 99.5%, and there will be a 24-hour response time for every problem.
ISDN DSL or IDSL
Another type of DSL Internet Service is the so called IDSL which is actually a hybrid DSL (ISDN technology) that was designed at the same time when the other forms of DSL Internet technologies were made. IDSL however is not used that much because of the low speeds that it offers, actually only a maximum of 128 Kbps.
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