3.1 Reference Model Definitions
This part of the Standard is based on the concepts developed in ISO 7498-1 and makes use of the following terms defined in it:
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application entity
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application layer
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application process
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data link layer
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layer entity
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network layer
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physical layer
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presentation layer
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presentation service
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protocol or layer protocol
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protocol data unit or layer protocol data unit
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service or layer service
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service access point
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session layer
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transfer syntax
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transport layer
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transport protocol
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transport connection