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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.

ShopforDSL provides the largest coverage area for High Speed Business SDSL and ADSL Broadband Internet access and affordable broadband solutions for small - medium business or home office. We have created a one-stop-shop interface that will allow you to see real-time availability in your area.

Latest Handset News

HTC has used the Mobile World Congress (MWC) 2012 event to give its new range of handsets the best opportunity to flourish this year. While 2011 was something of a struggle for the firm due to its large number of new releases, the next 12 months are going to see a more focused effort which includes fewer handsets but an increased overall quality.

The HTC One X is the model which is the talk of the town at the moment because it represents the technical pinnacle of the market. This is thanks to its Nvidia Tegra 3 processor which has four physical cores each clocked at 1.5GHz.

This amount of processing power will be put to good use making Android 4.0 run smoothly and HTC`s fourth edition of the Sense interface will also give the hardware a workout.

A 4.7 inch HD display is the centrepiece of the One X and with a high definition resolution it should deliver levels of detail which were not possible on previous smartphones. The display uses a Super LCD panel, which is going to be a little less desirable than an alternative Super AMOLED screen as you might find on the Samsung Galaxy Nexus. However, HTC has proven in the past that S LCD screens can be bright and engaging, so it should not be much of an issue.

The HTC One S is a step down from the One X when it comes to hardware, but it is still going to be a very capable Android 4.0 handset thanks to its dual core 1.5GHz processor and 4.3 inch Super AMOLED display.

The One S will be the 2012 equivalent of last year`s Sensation XE, albeit in a much slimmer guise. Measuring just 7.6 millimetres thick, the One S will be one of the most slender smartphones around and it even manages to pack in an eight megapixel camera and all the connectivity trimmings you would expect from an HTC handset.

The chassis of the One S is impressively high-tech as it features a blend of carbonised metal and a ceramic finish, which should make it hardwearing and very stylish at the same time. The One X also has this polycarbon frame and it marks a major departure for HTC, which had previously relied on unibody aluminium shells for its smartphones.

The HTC One V is the least powerful of the three new phones launched during MWC. However, it will still run Android 4.0 and Sense 4.0, which means you can get an excellent software experience without having to pay the price for high end hardware.

A 1GHz single core processor, 3.7 inch screen and five megapixel camera with HD video capture will give it the competitive edge against other midrange mobiles. You will need to compare the HTC One V against the "http://mymobiledeal.com/Best-Blackberry-9810-Torch-Deals.aspx">best BlackBerry Torch deals in order to determine which model will best suit your needs. Aggressive network subsidies should also aid HTC`s handsets in 2012.