vpi/vci question...
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Posted by Dario T. on August 4, 2006, 10:38 am
Please log in for more thread options In italy we use PPPoA with vpi/vci (8,35) with every ISP. In DSLAM the ATM switch change these values? or how is it possible to demultiplex traffic between every user? Thanks in advance. Dario | |||||||||||||||||||
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Posted by Doug McIntyre on August 4, 2006, 12:03 pm
Please log in for more thread options Yes, the DSLAM changes the VPI/VCI value. Think of the DSLAM as a big ATM switch that maps in and out various VPI/VCI values. While all the ports have 8,35 facing out to the CPE, back to the network, they'll get mapped into something else, (ie. 32/32 for port 0/1, 32/33 for port 0/1, etc. etc.). Just part of the config setup of the DSLAM. | |||||||||||||||||||
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Posted by Dario T. on August 4, 2006, 12:56 pm
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thanks a lot. I had an exam called broadband cable systems at my university but never explained it :) Dario >>In italy we use PPPoA with vpi/vci (8,35) with every ISP. In DSLAM the ATM
>>switch change these values? or how is it possible to demultiplex traffic >>between every user? >
> Yes, the DSLAM changes the VPI/VCI value. Think of the DSLAM as a big > ATM switch that maps in and out various VPI/VCI values. While all the > ports have 8,35 facing out to the CPE, back to the network, they'll > get mapped into something else, (ie. 32/32 for port 0/1, 32/33 for > port 0/1, etc. etc.). > Just part of the config setup of the DSLAM. > > > | |||||||||||||||||||
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>switch change these values? or how is it possible to demultiplex traffic
>between every user?