FAQ > Internet Access
Which DSL and why; IDSL ADSL or SDSL?
First, it is important to understand the concepts of upstream and downstream speeds.
Downstream speed is the speed at which information is traveling from the Internet to your computer. Examples would be opening a web page on your computer screen, or opening e-mail messages.
Upstream, means you are sending information from your computer to the Internet. Examples of information traveling upstream are sending e-mail, Internet Video Conferencing. If you have ever tried to send e-mail with a large attachment, like pictures, large spreadsheets, electronic presentations, CAD files or large production graphics you have probably noticed how sluggish your upstream connection is. This can really slow down your business.
SDSL (Symmetrical Digital Subscriber Line)
SDSL is a symmetrical service, which means that information travels upstream and downstream at the same rate. It was designed for applications requiring high speeds in both directions. SDSL speeds begin at 192 Kbps and go as high as 1.5 Mbps. SDSL is well suited for business applications, Internet video conferencing as well as gaming because of its symmetrical nature.
ADSL (Asymmetrical Digital Subscriber Line)
ADSL is an asymmetrical service, which means that downspeeds are different from upload speeds. ADSL is faster downstream than upstream. Upstream speeds are 128 Kbps, while downstream speeds can be significantly higher - 384 Kbps . ADSL is primarily used by residential users who spend most of their time online downloading information.
IDSL (ISDN DSL)
IDSL is essentially used to provide DSL service to customers who do not qualify for SDSL or ADSL. IDSL is capable of reaching customers who are up to 6-7 miles away from the telephone company Central Office (C.O.). IDSL operates at a symmetrical speeds of 128-192 Kbps.
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