ECEN4533 Data Communications
Lecture #12        6 February 2012
Dr. George Scheets

ECEN4533 Data Communications
Lecture #13        8 February 2012
Dr. George Scheets

ECEN4533 Data Communications
Lecture #14 10 February 2012
Dr. George Scheets

ISP Router Overload

Internet Traffic Growth

Internet
Traffic

2008 - 2009 Comparison

2010 Internet Traffic Profile

Router

Switched Ethernet

Switched Ethernet

Ex) Leased Lines

Ex) Leased Lines

Ex) Leased Lines with Internet thru OKC

Ex) Commodity Internet
Corporate Connectivity

Ex) Commodity Internet
Corporate & Internet Connectivity

Virtual Circuit Backbone

Ex) Frame Relay, ATM, MPLS, Carrier Ethernet
Corporate Connectivity

Ex) Carrier Ethernet, FR, ATM, MPLS
Corporate & Internet Connectivity

Leased Line at OKC ↔ FR Net

Circuit Switched TDM

Packet Switched StatMux

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.

Probability Density Functions

1995 OSU Backbone Packet Histogram

2004 OSU Backbone Packet Histogram

IM Traffic Message Size

Traffic in 0.1 second intervals

Flip coin 50 times, repeat 400x

Packet Switched StatMux

Slide 33