Intelligent Building Dictionary

 

Fig. 6: OSI Model

Layer

Name

Function

Examples

7

Application

Network process to application

HTTP, SMTP, X.500

6

Presentation

Data representation and encryption

MIME, ASN.1, SSL

5

Session

Host-host communication

SIP

4

Transport

End-to-end connections and reliability

TCP, UDP

3

Network

Path determination and logical addressing

IP, IPsec

2

Data Link

Physical addressing

Ethernet, ATM, FDDI, PPP

1

Physical

Media, signal and binary transmission

RS-232, DSL, SONET