What is DSL technology and differentiate between DSL modem and DSLAM?

The DSL technology is defined as the digital subscriber lines. Here, the data is transmitted to the users over the telephone signal lines.

Voice communication over the telephone is the best example of the digital subscriber lines. Also, there are DSL services that are provided by DSL technology.

Here there is asymmetric and symmetric digital subscriber line both are supported by the DSL network.

The services provided by the companies that provide the DSL are −

  • The broadband internet connection

  • Voice communication

  • Video streaming at low speed is offered by the companies using the DSL network.

Purpose of DSL

The purposes of DSL are explained below −

  • DSL is used for maintaining or controlling the transferring speed of the internet.

  • With the help of DSL filters or splitters we will be able to get the telephone service and internet service and splitters split the persistence and regularity therefore, it will not be able to disturbed.

  • DSL technology is related to the family that comes in the xDSL in which x belongs to Asymmetric digital subscriber line (ADSL) etc.

  • It provides better bandwidth of telephone lines as compared to the standard bandwidth. This phenomenon is known as broadband services.


Let us see the difference between digital subscriber line (DSL) and digital subscriber line access multiplexer (DSLAM) −

  • The DSL is the network that is the digital subscriber line while the DSLAM is the digital subscriber line access multiplexer that is derived from the DSL network.

  • The DSL subscriber line network is used by the single user while the digital subscriber line access multiplexer allows connecting multiple digital subscriber lines that helps to use the networks using the multiplexing.

  • The topology used for the cable modem for the data transfer is the star topology that is used for the scale model for the data transfer system.

Symmetric and Asymmetric transfer rate

Let us have a look at the concept of symmetric and asymmetric transfer rate in ADSL mode.

The difference in the symmetric and asymmetric transfer rate in the ADSL modem is given as follows, in the symmetric the upload and the download have the same speed that is for the network same speed, while in the asynchronous different speed for upload and different for the download.

The symmetric is faster in upload and also accessible to cloud services while the asymmetric is costly and here the download speed is more.

It is preferred by the users to use symmetric for equal upload and the download speed while if the difference is required then asymmetric is preferred.


  • Symmetric − Fiber internet, synchronous digital hierarchy (SDH), Fiber broadband.

  • Asymmetric − WLAN network, ATM, TCP/IP model.

The figure given below depicts the DSL and DSLAM −

Updated on: 16-Sep-2021

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