Definition:
A download involves the receipt of a file copied from a remote network location. Often, a person downloads files to their personal computer from a remote server computer. In Microsoft email networks, for example, people download their email from an Exchange server to their Outlook client.
An upload involves sending a copy of a file to a remote network location. For example, Web publishers upload files to their Web server.
Sending files across a computer network does not necessarily constitute an upload or a download. The terms are more commonly used in client/server networking than in peer-to-peer networking.
One way to generate upstream traffic is to upload files to a server or send an email message. Conversely, downloading files and receiving email generate downstream traffic. Typical Internet users create much more downstream than upstream traffic.
Examples: The Web browser sends HTTP requests upstream to the Web server, and the server replies with downstream data usually in the form of HTML pages.
Asymmetric DSL (ADSL) services provides less bandwidth in the upstream direction in order to reserve more bandwidth for downstream traffic.
Measurement Units
Download / upload
Measured by kilo byte
Downstream / Upstream
Measured by kilo bit
So when we look to any ADSL line as an example we will find the following :
1024 kbit is a downstream rate and so if the line works 1:4 this means that it works 1024:256
If we knew that the ADSL line works 1:4 this means that
downstream = upstream*4
As download measured by kilobyte and downstream measured by kilobit , So download rate = downstream \ 8
Examples :
ADSL line with speed 1 m
Downstream = 1024 kbit
Upstream ( If 1:4) = 256 kbit
Download rate = 1024\8 = 128 kbyte
Upload rate = 256\8 = 32 kbyte
Download
A download involves the receipt of a file copied from a remote network location. Often, a person downloads files to their personal computer from a remote server computer. In Microsoft email networks, for example, people download their email from an Exchange server to their Outlook client.
Upload
An upload involves sending a copy of a file to a remote network location. For example, Web publishers upload files to their Web server.
Sending files across a computer network does not necessarily constitute an upload or a download. The terms are more commonly used in client/server networking than in peer-to-peer networking.
Upstream
From the user's perspective, upstream network traffic flows away from the local computer toward the remote destination.One way to generate upstream traffic is to upload files to a server or send an email message. Conversely, downloading files and receiving email generate downstream traffic. Typical Internet users create much more downstream than upstream traffic.
Downstream
Conversely, downstream traffic flows to the user's computer. Traffic on most networks flows in both upstream and downstream directions simultaneously, and often when data flows in one direction, network protocols often send control instructions (generally invisible to the user) in the opposite direction.Examples: The Web browser sends HTTP requests upstream to the Web server, and the server replies with downstream data usually in the form of HTML pages.
Asymmetric DSL (ADSL) services provides less bandwidth in the upstream direction in order to reserve more bandwidth for downstream traffic.
Measurement Units
Download / upload
Measured by kilo byte
Downstream / Upstream
Measured by kilo bit
So when we look to any ADSL line as an example we will find the following :
1024 kbit is a downstream rate and so if the line works 1:4 this means that it works 1024:256
If we knew that the ADSL line works 1:4 this means that
downstream = upstream*4
As download measured by kilobyte and downstream measured by kilobit , So download rate = downstream \ 8
Examples :
ADSL line with speed 1 m
Downstream = 1024 kbit
Upstream ( If 1:4) = 256 kbit
Download rate = 1024\8 = 128 kbyte
Upload rate = 256\8 = 32 kbyte
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