DSL

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Digital Subscriber Line (DSL) - What is it?

Digital Subscriber Line or DSL for short, is a modem-like technology that allows for the transmission of voice, video and data over existing telephone lines at megabit speeds.

DSL services uses the high frequency spectrum on the same lines that deliver voice service to home and business users. This means that both voice and data can run simultaneously without the need for additional phone lines or other connections to the ISP.

DSL AdvantagesCustom writing service can write essays on DSL

The great thing about DSL is it uses the unused bandwidth that already exists on your phone line. Your phone service will continue to operate the same way as it did before DSL was installed. This means you can surf the Internet and still be able to pick up the phone and make a phone call, and all on a single phone line.

Speed

What you here Digital Subscriber Line (DSL) solutions offer the user data speeds of up to 50 times the rate of a traditional analog 8.8 Kbps modem.

What you get It depends on how close you live to your telco and how much you are willing to pay for bandwidth. In general, with basic DSL service you will be able to download a 5MB file in under 1.5 minutes. Now thats Fast..

Reliability

Phone company networks are among the most reliable in the world, experiencing only minutes of downtime each year.

Convenience

Since your DSL connection is always on. Theres no need to dial-up and wait for a connection every time you want to do something online. You will also never experience line dropping when youre in the middle of browsing or downloading.

Types of DSL

xDSL is used interchangeably with the acronym DSL to describe all the different variations of the technology. Basically they all fall into one of two categories Asymmetric DSL and Symmetric DSL.

Home and Residential - Asymmetrical DSL

Asymmetric DSL (ADSL) reserves more bandwidth going downstream to the user and less going upstream. Asymmetric DSL works by using more bandwidth for downloads to the user and less bandwidth for uploads from the user to the Internet. This is more attractive to Internet surfers because they typically download much more data than they send.

Business - Symmetric DSL

Unlike Asymmetric DSL, Symmetric DSL provides the same bandwidth for both downstream and upstream data. Because of the larger bandwidth (and cost) requirements, it is more suited for Web servers, corporate networks, and those who send out large quantities of data.

Choosing an Internet Service Provider

This will most likely be the hardest decision you will have to make when deciding on DSL service. There are so many different providers competing for your business, how can you possibly make a decision.

In general remember the following Local ISPs usually have better pricing than the National ISPs. Also, Local ISPs can sometimes give you better bandwidth speeds. On the other hand, National ISPs usually have better technical support, larger service areas and special promotional offers.

Conclusion Shop around before you buy.

DSL Hardware Information

At minimum you will need a DSL modem and network card. Most ISPs will provide the modem for free if you sign up for at least one year of service. Network cards are inexpensive and can be purchased as kits to network multiple computers together. For more than two computer, they can all be connected to one DSL modem using a router or firewall/router combination.

Security Concerns

If you create a home network to connect multiple computers and/or share your broadband Internet connection, you should consider installing a network firewall, especially if you have enabled file and print sharing on your home LAN. A network firewall is a separate hardware device that creates a security barrier between your network and the Internet. Be sure the firewall you choose offers stateful packet inspection the strongest form of security for small networks.

Technologies Comparisons

How does DSL stack up against other broadband technologies. The following information will show you the pros and cons vs. DSL broadband. Hopefully this will help you decide what broadband technology is best for you.

DSL vs. Analog (dial-up) modems

Analog modems have reached their technical limit using the V.0 technology. It is possible to bond or shotgun two 56K modems together for more bandwidth (up to 11K). However, you will still need an extra phone line. When you consider the costs for multiple lines and the extra ISP costs for shotgun access. Its cheaper, faster and more reliable to chose another broadband option.

DSL vs. Cable modems

Cable modems offer high-bandwidth Internet access over cable TV lines, the service is reliable, and service costs are close to that of most DSL. Cable modems are used primarily for home and residential Internet access because most commercial and business buildings arent usually wired for cable television service.

With a cable modem, you are sharing access to the Internet, unlike DSL which runs on a dedicated connection. The downside of shared access is security. Hackers may be able to break into other computers on the same cable network.

Also, as more users in a neighborhood send and receive information, the available bandwidth for individual users shrink, potentially slowing bandwidth speeds down to a crawl.

DSL vs. Satellite access

DBS service requires a small dish, mounted outdoors to receive data sent from a stationary satellite. DBS service providers can deliver download speeds approaching 50 kilobits per second.

The downside is that satellite services are receive-only. You still need a phone line and modem to request (upload) information from the Internet.

DSL vs. ISDN

ISDN is a widely available, faster alternative to analog modems. Its not as fast as DSL, Cable or Satellite and it cost -5 times more. If your area does not offer any of the other high-bandwidth options, ISDN is the only way you will be able to break the 56K barrier.

Conclusion

In most areas, only one or two of these technologies are available. If your lucky enough to live in an area that has all the options. Shop around, talk to people, and find out what kind of speeds they have experienced based on what the theoretical maximum can be. Also remember to check the technical support service and options when deciding on a provider. If you cant get a hold of anyone concerning technical issues, it doesnt make a difference how fast the service is.

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