Friday, September 18, 2015

Digital Subscriber Line

Digital Subscriber Line

As Internet access became widespread and increasingly important part of business, the telephone companies (the platform for internet connection) realize that they need to have a more competitive product. 

The telephone companies got solution is to start new digital services, offering over the local loop. They aim to provide Services with more bandwidth than standard telephone service (broadband).

A digital subscriber line (DSL) connection is a high-speed network connection. DSL connection is done by using the same wires as a regular telephone line. 

DSL provides dedicated point-to-point network access services. DSL service is provided using copper wire that is twisted-pair cable. The connection loop between a network service provider's central office and the customer.

DSL modems are connected to Digital Subscriber Line Access Multiplexer (DSLAM) through DSL circuits.

It creats three data channels: a high-speed downstream channel, a low-speed upstream channel, and a basic telephone service channel.

The DSLAM (the cloud) provides one of the main differences between DSL and cable modems.

Because cable-modem users generally share a network loop that runs through a neighborhood, adding users means lowering performance in many instances.

Asymmetric Digital Subscriber Line (ADSL) provides a dedicated connection from each user to the DSLAM. Therefore, users won't see a performance decrease as new users are added.

Customer premises must contain Network Interface device which is connected to DSL connection. The Network Interface device is closely connected to splitter, which separates channels (band).

A DSL Modem can be used to connect to a modem port defined in the Cloud using telephone wire.

Another device (such as a PC or a router) is connected to Ethernet port on the DSL Modem.

The DSL Modem acts like a bridge forwarding traffic from one port to the other port.

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