The term Upstream usually refers to the sending of information over a network. It is actually the speed with which you send data (or upload data) and is called the Upstream Rate. Conversely, whenever a user receives information over a network, the speed at which you receive data (or download data) is known as the Downstream Rate. Whereas Downstream is important to the average home user for the purposes of downloading content, Uploads are used mainly for web server applications and similar processes where the sending of information is critical. ADSL and Cable modems are asymmetric (not arranged in a symmetrical way), thereby rendering the Upstream speed to be much lower than that of its Downstream speed.
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