Hi! can any one explain me what is mean of protocol stack? Regards
This is the point where we quibble about whether or not a cell phone or telco switch is a "computer"... (I think so, at least for this purpose. But of course you can counter-quibble that there exist protocols that don't involve computers -- say, Morse code, or semaphore, and the address that sends the telegram on beyond the receiving telegraph station; or proper etiquette when "calling CQ" or "breaking" into a CB channel.)
Wikipedia says: "A protocol stack is a particular software implementation of a computer networking protocol suite." Wikipedia further defines: "Computer networking is the scientific and engineering discipline concerned with communication between computer systems." So the term "computer networking" may be a bit misleading here: protocol stacks are certainly not restricted to computer networking - a protocol stacks is any software implementation of any communications protocol. eg, your mobile phone contains a GSM (or whatever) protocol stack; telephone networks make extensive use of protocol stacks, etc, etc,...
http://en.wikipedia.org/wiki/Protocol_stack - Dejan
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