PAcket /Circuit switched?
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Posted by gregg johnstone on July 18, 2006, 4:11 am
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Posted by The Dude on July 18, 2006, 10:22 am
Please log in for more thread options Packet - The unit of data sent across a network Circuit - A communications path Switched - To connect, disconnect, or divert (an electric current) by operating a switch Packet/circuit Switched - A dedicated communication path established between the sender and receiver along which all packets travel. The telephone system is an example of a circuit switched network. Also called connection-oriented The Dude | |||||||||||||||||||
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Posted by shrike@cyberspace.org on July 18, 2006, 2:11 pm
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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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Posted by gregg johnstone on July 19, 2006, 4:33 am
Please log in for more thread options 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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