3 Definitions
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# 3 Definitions

## 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 layer

3. application process

4. data link layer

5. layer entity

6. network layer

7. physical layer

8. presentation layer

9. presentation service

10. protocol or layer protocol

11. protocol data unit or layer protocol data unit

12. service or layer service

13. service access point

14. session layer

15. transfer syntax

16. transport layer

17. transport protocol

18. transport connection

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2.2 Other Documents | Home | 3.2 Naming and Addressing Definitions