ECEN4533           
Data Communications
Lecture #4          21 January 2009
Dr. George Scheets

ECEN4533 Data Communications
Lecture #5          23 January 2009
Dr. George Scheets

PSTN: Wired Phone

POTS Call Sequencing

ISDN connection
using PSTN

Carrier PSTN Network

Moving Traffic with Packets

PSTN Connectivity via BRI ISDN

Ex) Internet

Internet Service Provider Backbone

Internet Call Sequencing

Ex) ATM

ATM Backbone

ATM Call Sequencing

Moving Traffic with ATM Cells

Internet Packet Format

Internet Protocal v4

OSU Campus Network (> 2001)

OSU Internet Connectivity (simplified)...

Traceroute to WWW.CISCO.COM

Traceroute to WWW.TULSA.COM

ISP Routes Not Necessarily Optimum

Fall 2007 Weird Route Seen by Student

Internet Protocal v6

Slide 25