ECEN4533 Data
Communications
Lecture #24 3 March 2008
Dr. George Scheets
ECEN4533 Data
Communications
Lecture #25 5 March 2008
Dr. George Scheets
ECEN4533 Data
Communications
Lecture #26 7 March 2008
Dr. George Scheets
Classical Queuing
Theory
Vs. Self Similar
Carrying Capacity
% of Line Speed carrying Application Traffic
Low Speed Links
Likely Delay Constrained
Plenty of Memory Available
High Speed Links
Likely Memory Constrained
Plenty of Time Available
Circuit Switch TDM Trunking
(Old ‘Private Line’ Network Model)
Packet Switch StatMux Trunking
(Pure Internet Model)
Internet Service Provider Backbone
Cell Switch StatMux Trunking
(ATM Model)
Switched Network Carrying
Capacities
High Speed Trunk (OC-3)
Switched Network Carrying
Capacities
High Speed Trunks
Turn of the Century
A Mixed Traffic Environment
Switched Network Carrying
Capacities
High Speed Trunks
Switched Network Carrying
Capacities
High Speed Trunks
The Big
Unknown...
What impact will Video have?
Backbone Network
No single technique works best for all traffic mixes.