ECEN4533
Data Communications
Lecture #12 4 February 2008
Dr. George Scheets

ECEN4533 Data Communications
Lecture #13 6 February 2008
Dr. George Scheets

ECEN4533 Data Communications
Lecture #14 8 February 2008
Dr. George Scheets

Two Types of Addresses

Whose Address goes where?

Whose Address goes where?

Packet to Print?
Must know destination IP Address

Shared 802.3 Ethernet

Whose address goes where?

Shared 802.3 Ethernet

Switched Ethernet

Switched Ethernet

Whose address goes where?

Whose address goes where?

Frame Relay

Frame Relay Backbone

Frame Relay Backbone

Frame Relay VC Set Up

Frame Relay Packet Format
(Assuming Ethernet LAN)

ISO OSI Seven Layer Model
Frame Relay Switch (Layer 1 & 2)

Frame Relay Backbone

Frame Relay Backbone

Moving Packets
PC1 > Ethernet (Switched) Hub > Router1 > FR1 > FR2 > Router2 > Ethernet (Switched) Hub > Server

Moving Packets
PC1 > Ethernet (Switched) Hub > Router1 > FR1 > FR2 > Router2 > Ethernet (Switched) Hub > Server

Moving Packets
PC1 > Ethernet (Switched) Hub > Router1 > FR1 > FR2 > Router2 > Ethernet (Switched) Hub > Server

Moving Packets
PC1 > Ethernet (Switched) Hub > Router1 > FR1 > FR2 > Router2 > Ethernet (Switched) Hub > Server

ATM

ISO OSI Seven Layer Model
ATM Switch

ATM Cell #1 Format AAL5

Carrier ATM Network

StatMux
ATM Version

OSU Campus Network ('95 - '01)

ATM Network

ATM PVC Set Up

ATM Connection Admission
Control

ATM Connection Admission Control

The Internet

Internet Service Provider Backbone

Washington D.C. Area - 2000

ISO OSI Seven Layer Model
IP Router

Internet Service Provider Network

Leased Lines

Frame Relay PVC's

Light Path (Wave) Connectivity
(OC-48 or OC-192)

Internet Packet Format

ISP Router Overload

Circuit Switched TDM

Queue Length

Queue Length

Queue Length @ 100% Load
Output capacity = 7 units
Input = 7 units on average (two dice rolled)

Queue Length @100% Load
Will tend to increase w/o Bound.

Packet Switched StatMux

Useful Probability Theorems