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:

a) application entity

b) application layer

c) application process

d) data link layer

e) layer entity

f) network layer

g) physical layer

h) presentation layer

i) presentation service

j) protocol or layer protocol

k) protocol data unit or layer protocol data unit

l) service or layer service

m) service access point

n) session layer

o) transfer syntax

p) transport layer

q) transport protocol

r) transport connection