ATM differs mostly in that the ATM specification covers all layers and switches differently than Ethernet. ATM is a cell relay that encodes data traffic in small 53 byte cells. It also provides for prioritization.
She also provides a great explanation, in this Ask the Expert response, of how ATM and EoATM work and can be applied to networks.
For more information, this expert response from Tom Pisello on our sister site, SearchUnifiedCommunications.com, explains how ATM networks compare with IP networks, specifically: Comparing IP with ATM networks. RAD University, also, has an ATM tutorial generated by students at leading universities in Israel that you may find useful.
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