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DSL, T1, T3, VoIP... Get a FREE 'Real Time' Quote

Welcome to the Shop4DSL real-time business DSL, T1 and T3 quote tool! Use our free service to perform unbiased price research to find the best service at the best possible price. You can also call our toll free help line at 800-880-2001 (Ref. # 7557) for live assistance.

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Who We Are
shop4dsl.com is the result of the cumulative efforts of independent T1 agents and customers from all over the world, the realized dream of thousands seeking real-time T1 and DS3 price quoting. It took a team of expert programmers months of research, experimentation, and over $1M in funding to create GeoQuote. That investment is now paying huge dividends; the days of having to contact a myriad of companies and then wait days or even weeks for them to send you back a price quote are now a thing of the past.

What We Do
Although GeoQuote is used primarily as a good faith price estimate tool, behind it is a team of T1 service experts that are ready to help. Just minutes after you submit your information to obtain a price quote, one of our trained and experienced T1 consultants will contact you to discuss your situation, analyze your needs, and give you the unbiased research that you deserve. Making an informed decision will be easy and quick with our revolutionary new T1 shopping system.

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Our T1 experts continue in their commitment to bring to the best T1 pricing tools available. A team of programmers remains in constant contact with our T1 providers to update rates, coverage area, and specials/promotions. You can rest assured that we will be here for you during all phases of service, from the decision making process, the application and credit approval process, the installation process, all the way through to the end of your contract and eventual renewal of your service. We are committed to you in every aspect of the customer relationship.

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 High-Speed DSL

Written by: DirectGlobal Communications - Mar 20, 2010


At the customer premises, a DSL router or modem connects the DSL line to a local-area network (LAN) or an individual computer. The modem also organizes the aggregate data stream created by multiplexing downstream channels, duplex channels, and maintenance channels together into blocks, and attaches an error correction code to each block. The receiver then corrects errors that occur during transmission up to the limits implied by the code and the block length. The unit may, at the user's option, also create superblocks by interweaving data within sub-blocks; this allows the receiver to correct any combination of errors within a specific span of bits. This allows for effective transmission of both data and video signals alike.

To create multiple channels, DSL modems divide the available bandwidth of a telephone line in one of two ways -- Frequency Division Multiplexing (FDM) or Echo Cancellation. FDM assigns one band for upstream data and another band for downstream data. The downstream path is then divided by time division multiplexing into one or more high-speed channels and one or more low speed channels. The upstream path is also multiplexed into corresponding low speed channels. Echo Cancellation assigns the upstream band to over-lap the downstream, and separates the two by means of local echo cancellation, a technique well know in V.32 and V.34 modems. With either technique, DSL splits off a 4 kHz region for POTS at the DC end of the band.

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