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DSL (Digital Subscriber Line)

 

DSL is a set of standards for broadband network connectivity over normal telephone lines. When you connect to the Internet, you might connect through a regular modem, through a local-area network connection in your office, through a cable modem or through a digital subscriber line (DSL) connection.

DSL is a very high-speed connection that uses the same wires as a regular telephone line. Typically, the download speed of consumer DSL services ranges from 256 kilobits per second (kbit/s) to 24,000kbit/s, depending on DSL technology, line conditions and service level implemented. Typically, upload speed is lower than download speed for Asymmetric Digital Subscriber Line (ADSL) and equal to download speed for Symmetric Digital Subscriber Line (SDSL). We mentioned earlier that DSL is a family of standards. Types of DSL include:

· ADSL - Asymmetric DSL (a version of DSL with a slower upload speed)

· HDSL - High bit-rate DSL (this is a fast connection, but works only over a short distance)

· SDSL - Symmetric DSL (a standardized version of HDSL)

· VDSL - Very high bit-rate DSL and Others.

Here are some advantages of DSL:

· You can leave your Internet connection open and still use the phone line for voice calls.

· The speed is much higher than a regular modem

· DSL doesn't necessarily require new wiring; it can use the phone line you already have.

The company that offers DSL will usually provide the modem as part of the installation.

But there are disadvantages:

· A DSL connection works better when you are closer to the provider's central office.

· The connection is faster for receiving data than it is for sending data over the Internet.

The service is not available everywhere.

The reason that modems are slow in that telephones were invented for carrying human voice and entire system has been carefully optimized for this purpose. For this optimization telephone wires at end office runs through a filter to attenuate frequencies below 300 Hz and above 3400 Hz (this usage of total capacity is very small). The trick that makes DSL work is that when a customer subscribes to it, the incoming line is connected to a different kind of switch, one that does not have this filter, thus making the entire capacity of the telephone lines available.

 

The DSL services have all been designed with certain goals in mind. First, the services must work over existing telephone wires. Second, they must not affect customers’ existing telephones and fax machines. Third, they must be faster than 56 kbps. Fourth, they should be always on, with just a monthly charge but no per-minute charge.

Some DSL implementations move data traffic over the same pair of wires which carry voice telephone traffic. Other DSL implementations move date traffic over a dedicated wire pair. If the home has a telephone line with two wires and only one telephone line in use, DSL can be installed on the second pair. If the home has both telephone lines in use, DSL must share one wire pair with voice traffic. This is done using a DSL splitter. A DSL splitter is a small box which attaches to the wire pair and splits it into two separate wire pairs, one for voice traffic and the other for DSL traffic.

DSL standards simply offer higher bandwidth over existing telephone lines with the possibility of using voice and data services simultaneously.

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