What is DSL?
DSL (digital subscriber line) carries both voice and data simultaneously using your existing phone line. It delivers high-speed Internet connectivity to your home using your existing telephone line at speeds that will allow you to do more than dial-up. What this means to you is that you can talk on the phone and surf the Net at the same time.
Digital Subscriber Line, or DSL, is a technology that allows data to be transmitted over a dedicated digital circuit using ordinary copper phone lines between a business or residence and a telephone company's central office. DSL transmits at much higher speeds than traditional, analog technology. DSL technology can also allow you to make a phone call while transmitting data (while using the Internet, for example) on the same line. There are several different types of DSL technology, offering speeds from 15 to 50 times faster than today's analog modems. DSL works by replacing conventional analog call-switching equipment with digital modems known as DSL multiplexers, sometimes called "D-slams." The speed at which homes and businesses can send and receive text, video and other data depends, in part, on how far away they are located from the central office where the D-slam is installed.
So, why stick with the antiquated dial-up method when DSL offers you the freedom and flexibility to multi-task?
How does DSL work?
Digital Subscriber Line, or DSL, is a technology that allows data to be transmitted over a dedicated digital circuit using ordinary copper phone lines between a business or residence and a telephone company's central office. DSL transmits data at much higher speeds than traditional, analog technology.
DSL technology can also allow you to place or receive phone calls while transmitting data (while using the Internet, for example) on the same line. There are several different types of DSL technology; offering speeds are 15 to 50 times faster than today's analog modems.
DSL works by replacing conventional analog call-switching equipment with digital modems known as DSL multiplexers, sometimes called 'D-slams.' The speed at which homes and businesses can send and receive text, video and other data depends, in part, on how far away they are located from the central office where the D-slam is installed.
How does DSL compare to cable modems?
Cable modems offer service over a shared cable. Tens, and possibly hundreds, of users may be connected to this local cable line. Access speed is compromised as more users access a cable data network. The capacity available to any one user inevitably drops. DSL technology provides a dedicated service over an existing telephone line. DSL provides dedicated service you don't have to share your access connection with other users and therefore you'll see more consistency and persistency in your connection
What is ADSL?
DSL connections can be configured to offer faster data rates "downstream," to your computer from a host computer than "upstream" from your computer to a host computer. This is called Asymmetric Digital Subscriber Line, or ADSL, and is best suited for some applications, such as using the Internet, where you typically need to receive more data than you send. Other DSL applications - a corporate data network, for example - require symmetric service, where data are sent at the same rate in both directions
How is DSL different from ISDN?
DSL and ISDN have a number of things in common; however, they each have their own advantages that make them the best solutions for different customers. One primary difference is that ISDN is a switched, multi-point service. For instance, you can use your ISDN line to dial up an Internet connection, then later establish different ISDN connections to send a high-speed fax or connect to a corporate LAN (local area network) - all the while, having the ability to also use the same phone line for digital voice calls. With DSL, your data connection is an "instant on" connection (no busy signals), and is a dedicated, point-to-point connection to a particular service, such as an Internet service provider.
Will I have to purchase hardware or software to use the services?
Some applications as well as some individual access technologies may require purchase of equipment or software. Generally, DSL providers will make basic hardware needed for a data service available as part of the installation process. Provider technicians can be available to install the necessary equipment and test the service for you or will help you with difficulties you may have if you choose to install the equipment yourself. DSL requires a DSL modem and an Ethernet card or USB connection in your PC.
Does DSL require installing an additional phone line?
No. DSL utilizes varying frequency spectrums, 0-4 kHz for POTS (Plain Old Telephone Service) and 100 kHz - 2.2Mhz for data transmission. This allows simultaneous analog voice or fax and DSL data transmission over the same telephone line at the same time.
Can I connect to AOL?
Yes, America Online offers a special TCP/IP account for customers who already have high-speed Internet access (ISDN, DSL, etc.). This allows you to use your DSL service to access AOL content without giving up AOL.
Can I continue to use America Online?
AOL has a product called 'Bring your own access', which for about $10 a month lets you use the familiar AOL environment. You will end up paying a little more than you would if you just used DSL, and two parties would be billing you but if you wish continuity with your AOL account, this would be the way to go.
What do Downstream and Upstream mean?
Downstream is data flow from the Internet or a LAN to your computer (data you receive); while Upstream is the data flow from your computer to the Internet or LAN (data you send). A typical user requires much higher bandwidth Downstream (to download web pages or files from a LAN) than upstream. But if you are transferring large files from your computer to another location or to the Internet, then you may need higher Upstream bandwidth than the typical user
Do I get a dynamic or static IP address?
Most residential customers receive a dynamic IP address that adds an additional layer of security at no additional charge. A static IP may be requested for an additional small monthly fee from some providers.
What is an IP Address?
IP stands for "Internet Protocol". An IP address allows your computer to be identified while you are on the Internet. While most DSL customers use Dynamic IP, some advanced users may be interested in a Static IP product. Here is the difference between Static and Dynamic IP
Where can I find information about NIC Cards?
A network interface card (NIC) provides your computer with the capability to communicate with other Ethernet based devices like the DSL modem or router you will use with the service. They are available in a variety of different types, one of which should work with your computer. You can also purchase a NIC card at a computer retailer.
Reduce the number of hours that your computer is physically connected to the Internet by logging off or by other means.
Make sure that your computer's settings minimize vulnerabilities.
Keep up-to-date on security fixes for your operating system and programs.
Install firewall software to prevent attacks from being successful
If a computer is equipped with both Ethernet and USB, is one better to use?
If a computer has the option of USB or Ethernet, Ethernet would be the better choice. The USB adapter is a work-around for those people who are unable to add a network card, or are intimidated by opening the computer case to install a network card. While the USB adapter allows use of the USB port for networking, the USB port was never really intended for networking. In short, the Ethernet connection is the right tool for the job and the USB adapter is a suitable substitute.
