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Posted by gregg johnstone on July 19, 2006, 4:33 am
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Thanks guys- much clearer now-liked the phone analogy
shrike@cyberspace.org wrote:
> gregg johnstone wrote:
> > Can anyone explain this in laymans terms please-many thanks
>
> Think of circuit switched like the old telephone system where operators
> from one city would call another city and each one in sequence would
> move a cable on a patch pannel.
>
> This one "circuit" was created end to end. While this happens with big
> phone switches governed by SS7 now, it still operates with the same
> basic principle. There is communication from A to B by an
> administrative system before a connection is set up. Your "circuit" is
> private and you have dedicated bandwidth.
>
> Packet switched: The network knows how to get from A to B at all times.
> So you can drop any piece of correctly addressed information on the
> wire and expect it to get to the remote end. However you have no
> dedicated bandwidth once the data is in the core network, except as
> provided by specialized techniques like Frame CIR.
>
> Cell switched is the same as packet switched except the "cells" are
> fixed length, and have some more fancy traffic management features.
>
> Generally:
>
> Circuit: ISDN, Modem
> Packet: Frame Relay, Ethernet
> Cell: ATM
>
> What do you call an MPLS tagged packet?
>
> -Matt
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