1. Overview of communication technology.
Basic Communications
Overview of communication technology.

2. Communications Electronically exchanging data or information.
Voice interactive communication
Data large volume batch transmissions
Image encoded graphics
Video streaming media

3. Telecommunications History
Pre 1984
Local and long distance monopoly
1984 AT&T settlement
Intense long distance competition
1996 Telecommunications Act
Local access competition

4. Standard Telephone System
Analog
Switch
Switch
Switch
Digital
Modem
Digital
Digital
Analog
Network
Network

5. Telephone Changes Rapidly decreasing long distance rates
Value added telephone services
Cellular access
Flat rate long distance?
Data and voice convergence.

6. Issue: Access Dedicated lines Standard voice
Integrated Services Digital Network
Digital Subscriber Lines
Cable Modem
Wireless

7. Voice vs. Data Voice Delay Sensitive Constant bit rate
Not error sensitive
Growth stable
(video ??)
Data
Delay insensitive
Variable bit rate
Error sensitive
Demand growing

8. Data Networks LAN Campus or Metropolitan Area WAN NIC Switch Router
Public TELCO
WAN
POP

9. OSI Reference Model Application Presentation Program Functions Session
Transport
Network
Data Link
Physical
Program Functions
Wide Area
Network Functions
LAN Functions
Connection Functions
©”A Guide to Networking Essentials”, 1998, Course Technology.

10. Packet Structure
Header(s)
Data Payload
Trailer

11. OSI Network Layers