3 Definitions
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# 3 Definitions

For the purposes of this Standard the following definitions apply.

## 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:

1. Application Entity

2. Application Process

3. Protocol or Layer Protocol

4. Protocol Data Unit or Layer Protocol Data Unit

5. Service or Layer Service

6. Transfer Syntax

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2 Normative References | Home | 3.2 Service Conventions Definitions