What type of DSL do most Internet service providers sell?
The DSL service offered by incumbent telephone company competitors is usually symmetric DSL (SDSL). SDSL has the same speed for downloading and sending to the Internet. LAN connectivity is offered to other corporate sites, Internet access, and Web hosting for the customer’s Internet domain name, as well as email service. Because the telephone company ADSL service is asymmetric, slower speeds are available for sending to the Internet than when receiving information from the Internet. Service providers claim that businesses send large files and thus need equal speeds for sending as well as downloading from the Internet. Residential consumers send mainly email messages that do not require high speeds. However, businesspeople tend to send large files such as PowerPoint and Excell attachments in addition to simple text emails.
