SMDS vs. ATM:
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ATM is one of technologies
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SMDS is a service which can be provided by ATM, Frame Relay or can be offered without ATM.
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SMDS is the first ATM service. It offers most of the same advantages as ATM
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SMDS is data-only solution; adding time-sensitive application (audio, video) support can be relatively easy
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SMDS and ATM cells are similar, but not quite the the same. Headers (5 bytes for ATM, 7 bytes for SMDS) must be translated
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SMDS: connection-less; ATM: connection oriented
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