Implemented on top of?

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What does it mean when it's said that something is implemented or runs OVER or ON TOP OF something else. For instance when a logical channel is said to be implemented on top of a cloud that connects a set of hosts.

Posted 16-Nov-11 11:58am

CSLexy

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TRK3 · Answer 1 · 2011-11-16T13:47:00

I've never seen "logical channel implemented on top of a cloud that connects a set of hosts".

That almost seems non-sensical. Did you see that in some marketing literature?

You'll normally see "OVER" when you are talking about a communication layer/protocol implemented using some lower level medium, such as:

"logical channel implemented on top of 4 physical channels" (meaning that the thing looks like one channel from a logical perspective, but it's acutally implemented over 4 separate physical connections [usually to increase the bandwidth or reliability])

"SATA over PCIe" -- meaning the SATA transaction layer-protocol transported on a PCIe physical layer.

"Voice over I/P" -- voice over internet-protocol

"ON TOP OF" is probably more common when speaking of platforms or components as S A Kryukov suggests.

"e-commerce solution implemented on top of a Oracle database"

Sergey Alexandrovich Kryukov · Answer 2 · 2011-11-16T12:08:00

The expression "implemented on top of" is associated with the notion of platform, see http://en.wikipedia.org/wiki/Platform_%28computing%29[^].

I don't think "on top of a cloud" is a widely used term. It would be, again, more correctly to refer to a platform. Consider this overview of cloud computing here: http://en.wikipedia.org/wiki/Cloud_computing[^]. Take a look at generalized cloud architecture and locate the "Platform" layer on a picture and the section "3.3. Platform". And, on top of a platform…

—SA

Implemented on top of?

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