Freescale Semiconductor TWR-MCF52259-Ethenet, User Manual, Page: 33 / 166

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The OSI 7 Layer Model
The Open Systems Interconnection Reference Model ( OSI Model or OSI Reference Model for short) is a
layered abstract description for communications and computer network protocol design, developed as part of
the Open Systems Interconnect initiative.
Layer 7 – Application
HTTP, SMTP, POP3, TFTP
Layer 6 – Presentation
Berkeley Socket Interface, XTI, Custom
Layer 5 – Session
Berkeley Socket Interface, XTI, Custom
Layer 4 – Transport
TCP, UDP
Layer 3 – Network
IP, ARP, ICMP (Internet Control Message Protocol)
Layer 2 – Data Link (MAC)
Ethernet, PPP
Layer 1 – Physical (PHY)
RS232, 10BASE-T, DSL, T1
Application
Transport
Network
Link
TCP/IP Four
Layers
Equivalent:
All People Seems To Need Data Processing”.