Asynchronous Transfer Mode is a layer 2 networking protocol which uses time division multiplexing with fixed size cells and runs on copper and optical mediums. It is commonly used in conjunction with SONET/SDH, and found in PSTN and Internet backbone networks.

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why ATM and MPLS are at level 2.5

i don't understand why ATM and MPLS are not well classified in networking levels stack iso/osi.
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ATM, why asynchronous?

hi i'm studing for a multimedia networks exams and i don't understand why ATM is asynchronous. i know that it is asyncrhonous if used with SONET but this makes no sense..
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Calculate vbr-nrt on a ATM interface?

We have a DS3 ATM with a 3Mb (soon to be 6Mb) PVC. How do you calculate the vbr-nrt setting on a Cisco router for this interface? Understanding the VBR-nrt Service Category and Traffic Shaping for ...