SBC Yahoo DSL

Thanks to a merger between AT&T, Inc., and Yahoo! Inc., your telephone has the capabilities of bringing the world wide web into your home or business using existing telephone lines. This union formally operates under the name AT&T Yahoo! as a result of a recent AT&T merger with SBC. Before the name was changed to reflect the addition of AT&T on January 1, 2006, the internet service provider (ISP) was known as SBC Yahoo!

Internet service using telephone lines comes in two forms – dial-up and DSL. Dial-up service is becoming a thing of the past due to its technological limitations. It is impossible to use both your telephone and your internet service at the same time with a dial-up connection. The inconvenience of this technology is being replaced by the much more flexible DSL service.

For use in this article, we will refer to this more advanced telephone / internet technology as SBC Yahoo DSL. The term DSL was once used to designate a digital subscriber loop but the terminology has been changed to digital subscriber line. Basic operation happens when digital information is passed along a telephone line to the end-user, who is a subscriber to the SBC Yahoo DSL service.

The SBC Yahoo DSL technology theoretically splits the telephone line into two separated bands of frequency. The voice communications, which take place at a low level of frequency, measured in Herz units (Hz) is filtered away from the higher frequencies used for internet access.

The filters employed in SBC Yahoo DSL transmissions allow digital transmission of information to and from the internet without interference with telephone operations. This allows the user to be using the internet at the same time he or she is having a telephone conversation, an impossibility with original dial-up service.

The filters required for SBC Yahoo DSL service are usually included at no extra cost when the service is installed, or initiated. The DSL service has traditionally relied upon the availability of co-existing telephone service and the pre-existing telephone lines for transmission.

The reliance on traditional landline telephone service is losing ground, however, to the more convenient cellular telephone services now available. In order to tap into the cellular phone market without losing business to the diminishing demand for landline phones, SBC Yahoo DSL is now available in a form known as dry-loop DSL, often called “naked DSL” because it doesn't need the telephone lines to transmit data.