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INTRODUCTION TO ADSL ASYMMETRIC DIGITAL SUBSCRIBER LINE
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In the previous article, we gave a brief overview of the DSL (Digital Subscriber Line) technology we use in our daily lives. Now, in this post, we’ll take a closer look at the first variant of the DSL, which is H. ADSL Internet technology (Asymmetric DSL). So let’s get started. The long form of
What is ADSL Internet in reality (ADSL Meaning) ?
ADSL is an asymmetric DSL. It proves higher bitrate downstream (from internet to user) compared to upstream bitrate (from user to internet). That’s why it’s called asymmetric. ADSL uses 1MHz twisted pair cable to dive the bandwth into 3 frequency bands. 1. The starting frequency band is between 0 and 25 kHz. It is used for plain old telephone sets (POTS). The service uses only 4kHz of this band, the rest is implemented as a guard band to separate the voice channel from the data channel. 2. The second frequency band ranges from 50 kHz to 200 kHz. It is used for upstream data communication. 3. The third frequency band is from 250 kHz to 1 MHz. It is used for downstream data communication. ADSL technology is designed for home users. It is not suitable for business applications, because such applications require more bandwth than home users.
Use of existing Local Loop in ADSL
ADSL uses existing subscriber lines and can still support very high data rates. In fact, local twisted pair telephone lines can support bandwths up to 1.1MHz. A filter installed at the end of the line reduces the bandwth to 4 kHz. Therefore, with this modification, the existing local loop can have a bandwth of 1.1MHz, and ADSL can use the existing loop for voice and data communication. Existing user connections can handle bandwths up to 1.1 MHz.
Adaptive Technology in ADSL
1.1 MHz of bandwth is not always available in practice. This depends on various factors such as distance, cable size, signal type, etc. Therefore, ADSL is designed as an adaptive technology. This means that the ADSL data rate is adjusted according to the actual situation and actual available bandwth. ADSL is an adaptive technology. The system uses a data rate based on local loop conditions.
Modulation Techniques in ADSL
Two modulation techniques are available for ADSL: Carrier Amplitude/Phase (CAP). Discrete Multitone (DMT). CAP is a modulation technique similar to QAM, with one important difference, the elimination of the carrier signal. Discrete Multitone Technology (DMT) in ADSL: DMT is the standard modulation technique for ADSL. It is a combination of QAM and FDM technology. Typically, the available 1.1MHz bandwth is dived into 256 channels. However, this is not a rule. The division can be from one system to another. Channel “0” is reserved for voice communication. Channels 1 to 5 are called free channels because they are not used at all. These channels form guard bands between the voice and data channels. Channels 6 to 30 (25 channels) are used for upstream data transfer and control. 24 channels are used for data transmission and 1 channel is used for control. Channels 31 to 255 (225 channels) are used for downstream data transmission and control. from 225 channels. One is reserved for control and the remaining 224 are reserved for data.
ADSL Modem !!
The ADSL modem installed at the customer’s premises is shown in the figure: The local loop (existing telephone line) is connected to a filter that separates voice and data. The sound enters the telephone instrument. Data goes to the ADSL modem, which modulates it using DMT to create upstream and downstream channels. Note that the dispenser must be installed at the customer’s site, usually by a telephone company technician. The voice line can use the existing telephone line at home, but the data line must be installed by a professional. All of this makes ADSL lines expensive.
ADSL Lite !!
Building splitters on their hypothetical edges, and wiring the information pipeline, can be expensive and impractical enough to deter many readers. A new and improved variant of ADSL technology called ADSL Lite (or Universal ADSL or Splitter ADSL) can be purchased for all these subscribers. This technology allows an ADSL Lite modem to be plugged into a phone jack and connected to your PC. The split is done at the phone company. It can prove a maximum downlink data rate of 1.5Mbps and an uplink data rate of 512Kbps. Finally we have reached the end of this article. Stay tuned for more interesting stuff. report this ad
What is ADSL technology?
ADSL (Asymmetric Digital Subscriber Line) is a technology that facilitates fast data transmission at a high bandwidth on existing copper wire telephone lines to homes and businesses. Unlike regular dial-up copper telephone line service, ADSL provides continuously available, always-on broadband connections.
What does ADSL internet stand for?
ADSL = Asymmetric Digital Subscriber Line. It’s a line that transmits data – but aysmmetrically, or unequally. The download lane needs more capacity than the upload lane.
What type of internet is ADSL?
ADSL is a popular, older type of broadband, with the term standing for Asymmetric Digital Subscriber Line. It is a broadband connection that works through the copper wires of existing phone lines and is mainly used for home broadband and within small businesses.
Why is ADSL important?
Asymmetric Digital Subscriber Line, or ADSL, is a communication technology that offers faster connection speeds over traditional telephone lines than dial-up internet provides. It powers many internet connections worldwide and enabled the broadband internet speeds that drove Web 2.0 and beyond.
How does ADSL connection work?
ADSL works by using spectrum above the band used by voice telephone calls. With a DSL filter, often called splitter, the frequency bands are isolated, permitting a single telephone line to be used for both ADSL service and telephone calls at the same time.
What are the features of ADSL?
ADSL is characterized by “high speeds” and “always on” connectivity. This is achieved by using the frequencies not being used by voice calls. ADSL was designed to support the typical home Internet user who downloads frequently rather than uploads data.
Where does ADSL connect to?
ADSL is a type of Broadband Internet connection.
Or “Digital Subscriber Line” (DSL). Very simply put, it is your connection to the internet. From your computer to the world wide web.
What speed is ADSL?
The four possible ADSL speeds are 256kbps/64kbps, 512kbps/128kbps, 1,500kbps/256kbps and the premium 8,192kbps/384kbps speed. ADSL 256kbps/64kbps speed: ADSL with a download speed of 256kbps (kbps equals ‘kilobytes per second’) is the most basic form of broadband.
Is ADSL a fibre?
Fibre broadband is better, faster and more reliable than standard ADSL internet and is delivered to homes and businesses through fibre optic cables. Pretty much every major internet service provider now offers fibre. Most connections connect to your home via the phone network cabinet in your area.
Is ADSL a wireless connection?
The ADSL Wi-Fi option:
ADSL is the optimal form of wireless internet one can have at home, and if it’s possible (some areas are too far from the phone exchange to receive ADSL), you should go for it. ADSL broadband is cheap, you get a large amount of download data, and it’s a fast internet connection.
What is ADSL modulation?
ADSL refers to a modulation scheme used to deliver network traffic to a customer’s residence using the same copper twisted-pair wiring used for voice and ISDN service. It coexists with both services, while offering 6-8Mbps speeds downstream and up to 640kbps upstream.
Is ADSL digital or analog?
ADSL is using an analog carrier to encode a digital signal. AN ADSL device includes a Modem (but a much faster and more complex one then the old dial-up ones) – the input to the modem on the sending side is digital, the modem converts it to analog, the remote side converts it back to digital.
See some more details on the topic What Is ADSL Internet Technology in a Physical communication network here:
What Is ADSL Internet Technology – ElectronicsGuide4u
It is used for upstream data communication. 3. The third band is from 250 kHz to I MHz. It is used for downstream data communication. ADSL …
What is ADSL (Asymmetric Digital Subscriber Line)?
Symmetric DSL (SDSL) is also a broadband technology that transmits data over a telephone network. However, with SDSL, the downstream bandwth — from the …
Asymmetric digital subscriber line – Wikipedia
Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that … Provers usually market ADSL as an Internet access service primarily for …
ADSL Technology Explained, Part 1: The Physical Layer
An ADSL system uses existing telephone wire to allow birectional data communications between a user and the telephone company’s central office (CO). Some …
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