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  Residential DSL is now available in Moline, Rock Island, East Moline, Milan,
Davenport, Bettendorf and Dubuque!

Even if you didn't qualify for DSL before, or your telephone company has told you they can't get DSL to you, the expanded service area of our sister company AscendTel may be your answer for high-speed Internet access. Fill out our pre-qualification form to see if you qualify!

Click here for our Illinois and Iowa G.Lite ADSL pricing.

Business Grade DSL is Now Available!

Business Grade DSL is now available in Dubuque and the Illinois and Iowa Quad City Area - Moline, Rock Island, Davenport and Bettendorf. If you would like more information or to see if you qualify for IDSL or SDSL, please call 309-736-8000 or email your contact information and request to .

DSL Overview

DSL, or Digital Subscriber Line, uses standard telephone lines to deliver data to users at high speeds.

DSL technology significantly increases the bandwidth and data transmission capacity of the copper wires that are already connected to most homes and businesses. DSL does this by using higher frequencies for data transfer than those used for a normal voice telephone call.

There are many varieties of DSL technology (generally described with the term "xDSL"). Internet Express provides the optimal business-to-business solution, SDSL.

SDSL (Symmetric Digital Subscriber Line) is a technology which provides data transfer rates that are the same speed in both directions (download and upload). This is the characteristic that differentiates SDSL from ADSL (Asymmetric Digital Subscriber Line), a residential DSL product that provides high-speed access over your existing phone line in which download speeds are faster than upload speeds. IDSL is similar to SDSL, but runs over ISDN lines and therefore is available at greater distances from the Central Office than the others and can be implemented in locations serviced by fiber.

Wiring/Line Qualification

Not all telephone lines are capable of passing the high frequencies used by DSL modems. There are also limits to the length of copper wire that DSL will work on. Therefore, a telephone line must be "qualified" before DSL can be installed on the line. The line qualification is done by the telephone company and checks the length of the local loop, for the presence of loading coils, for the presence of excessive bridge taps, for local loops that are provisioned over DLC, and the general state of the line.

Performance

One of the first things a new DSL user wants to know is "how fast is this line, really?" So they surf off to some server somewhere and try to download a big file. They are subsequently pleased at the speed or curious because the rate doesn't seem as fast as the modem is rated. Here are a few quick points to keep in mind while measuring your performance:

Know your modem's speed. Your modem speed is "trained up" or negotiated with the corresponding equipment at the other end of your local loop. DSL Modems, like standard analog modems, can train up at different speeds, depending on the line condition and configuration settings at the consumer end and Telco end of the connection.

Recognize that the Internet is not homogenous. Some servers may be far away and connected over slow links. You will not get fast transfer rates from these servers regardless of how fast your local connection is. You are only as fast as the slowest link (or slowest server). In other words, the best download test would be a connection to a fast server directly on your ISP's network. This kind of test eliminates the most unknowns.

Know what you are measuring. When you get performance numbers, where do you get them from? They may mean different things. For example, while downloading a file in Internet Explorer, IE will report a download speed. This is the speed that the actual file data is being copied. (For example, a 200k file that takes 60 seconds to transfer is a download speed of 3.3k/sec.) The actual number of bytes passed over the DSL connection is much higher because of the network overhead and error correction that takes place continually while transferring data.

Security

A DSL connection to the Internet has a greater security risk than an analog modem dialup connection. For one, the bandwidth is greater, allowing the possibility of more cracking to be done in the same period of time. More importantly, the connection is always on, which makes your hosts a much easier (and potentially more lucrative) target to find. Securing a connection to the Internet is a large topic and should be addressed on an individual basis to determine the best solution for your business. Just be aware that because any form of dedicated access is inherently more insecure than a dialup connection, it makes addressing security issues more important.


Click here for more information on Internet Express's Security Packages.

 

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