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Why Japan and South Korea use DSL,ADSL and VDSL ?

Difference between DSL , ADSL and VDSL and how it work : We discuss DSL, ADSL and VDSL in our life every day, but what is the difference between them, perhaps we try to know less. In this article, we will further discuss the same topic, what is DSL, ADSL and VDSL and how it works. It all three are core part of telecoms, it provides data to the subscribers. We will also look Why Japan and South Korea use DSL,ADSL and VDSL?

This is a kind of connection between the service provider and the subscriber. DSL, ADSL and VDSL provides a dedicated and point to point public network access. If you use ADSL, your PC is always connected to the Internet.On the other hand VDSL gives very good speed to the subscriber. Now we will discuss about them in detail.
DSL,ADSL and VDSL internet service details
Internet Services

What is DSL

Full name of DSL "Digital Subscriber Line", which is a modem and an Internet connection using digital data connection between a phone line by known generic Internet Service. Its biggest feature is that you can enjoy a good internet speed even when the phone line is busy, that is, you are also on call.

In other words, we can also say that DSL means that digital subscriber line is a modern technology that transports more bandwidth data to subscribers of the service using the already existing telephone lines. DSL provides a dedicated and point to point public network access.

DSL is between the network service provider central office and the customer site. Or it may also be a local loop built inside a building or campus. In today's era, DSL has attracted a lot of attention of service providers. This is because it delivers high-bandwidth data rates and that too over a considerable distance. For this, it makes small changes to the already existing telecommunications network. You can easily understand through the image given below.
DSL circuit diagram and connection details
DSL connection details 

Function of DSL

In other words, a digital subscriber line, ie DSL (formerly called Digital Subscriber Loop) is a means of communication through which an Internet transfer takes place using copper wire telecommunication line. 

In addition to cable internet, it is also a well-known method of providing broadband internet access by Internet service providers. The aim is to keep the high speed Internet transfer intact.

If you are thinking how this happens, that is, both telephone and internet facilities, then DSL filters are the answer. These are also called splitters. Using this, the frequencies are separated and ensure that they are not interrupted.

Types of DSL 

There are two types of DSL which are mentioned below-
1. Symmetric DSL
2. Asymmetric DSL

1. Symmetric DSL : SDSL separates upstream and downstream frequencies evenly, causing data transfer speeds to remain the same both for loading and downloading. These connections can deliver upstream and downstream speeds of 2Mbps. It is used more by small organizations.

2. Asymmetric DSL : The full name of ADSL is "Asymmetric Digital Subscriber Line", which is also a type of service in which the speed of data is sent upstream and the data received is called downstream. Speed ​​in and out of it is never the same. The speed found in it varies from time to time.

ADSL facilitates a large frequency range for downstream data transfers, which increases the download speed several times. The ADSL connection can deliver downstream speeds of 20Mbps and upstream speeds of 1.5Mbps. This is because most users download more data than they upload.

ADSL uses a special modem and microfilter in the customer's telephone line. Thanks to the filter, connection and telephone service can be used at the same time. The word 'asymmetric' in ADSL actually means faster than uploading the download.

If you use ADSL, your PC is always connected to the Internet. As long as the modem, router and A computer are enabled, you automatically have an Internet connection. Unless you manually disconnect. Unlike dial-up modems, ADSL can operate multiple computers in a single home for multiple residents at the same.

The most requested service is ADSL. When it comes to ADSL, the internet service provider offers options for higher bandwidth in upstream, downstream or both. It has all kinds of facilities, but it charges more for good speed.

Much slower than VDSL. VDSL does not support HDTVs. Adjustable bandwidths are not allowed while VDL can. Soaking is much less troublesome than VDSL. More suitable for those homes. Which are far away from telephone exchanges. More widely distributed.


Benefits of DSL

DSL has the following benefits-

No additional wiring required : Since a DSL connection uses a telephone connection you already have, you don't have to do anything else to upgrade your phone system further. It does not have to be installed new wires.


Cost Effective : DSL internet is quite cost effective and is also good in connectivity. It does not require extra expense.

Users can avail both of them at the same time as telephone line and internet service. This is because the transfer of voice has different frequencies and the transfer of digital signals has different frequencies.

The beauty of DSL is that there is a superfast internet connection even if you are calling. The only problem is that for this fast internet you have to be close to the telephone exchange.

Difference between ADSL vs VDSL

The Very High Bitrate Digital Subscriber Line or VDSL / VHDL is an improved version of ADSL (Asymmetric Digital Subscriber Line). This is one of the technologies that we can use to connect to the Internet. They apply in a different way.

Therefore, you cannot use one technology tool for another technique. The main difference between the two technologies is speed. With ADSL you can get 8mbps as upload speed and maximum download speed of 1mbps. VDSL can upload up to 52mbps for download and speeds up to 16mbps.

Due to the excessive speed supported by VDSL, it is seen as a good future technology for use applications requiring a high bandwidth. Think about HDTVs, which cannot be supported by ADSL.

Due to limitations and high price, the spread is not as large as ADSL. VDSL is widespread only in countries such as South Korea and Japan

VDSL providers also exist in other countries. There are often only a few companies per country. In comparison, ADSL is used extensively and there are many providers of this type of Internet connection in all countries.

Another very useful feature is that 7 uses different frequency bands to transmit data. Which frequency band can the user use to download or upload. This flexibility is great if you have to host some files that have to be downloaded by many people.

The most significant disadvantage for VDSL is the short maximum distance to the telephone exchange. Within 300 meters you still get maximum speed, but for larger distances kwaliteit lines and speeds much faster backwards.

This is why ADSL is still better, as long as you do not stay too close to your provider's telephone exchange. Most VDSL customers are therefore companies that require very high speeds. They often place their own servers in the immediate vicinity.

Its only problem is that whichever company you are using the internet, if you use the internet near its central office, then the speed is good and if you use the internet at a greater distance from the central office then the speed Decreases. There are several types of DSLs, such as: SDSL, VDSL, and ADSL.

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