ECEN4533 Data Communications
Lecture #17 23 February 2009
Dr. George Scheets

ECEN4533 Data Communications
Lecture #18 25 February 2009
Dr. George Scheets

ECEN4533 Data Communications
Lecture #19 27 February 2009
Dr. George Scheets

Autocorrelation

255 point Noise Waveform
(Low Pass Filtered White Noise)

Autocorrelation Estimate of Low Pass Filtered White Noise

Autocorrelation in ATM Cell Stream
Each cell slot randomly On or Off (Empty)

Autocorrelation in ATM Cell Stream
On & Off bursts average 20 cells

Packet Switched StatMux

Statistical Multiplexed Packet Switch

Exponentially Distributed Inter-Arrival Time
(Not a good fit to real world traffic)

Exponentially Distributed Packet Length
(Not a bad fit to real world traffic)

M/M/1 Queues

Classical M/M/1 Queuing Theory

Finite Buffer Queuing Performance

"Low Working Bid:"

Little's Rule

M/M/a Queues