ECEN4533 Data Communications
Lecture #15 11 February 2008
Dr. George Scheets

ECEN4533 Data Communications
Lecture #16 13 February 2008
Dr. George Scheets

ECEN4533 Data Communications
Lecture #17 15 February 2008
Dr. George Scheets

Probability Density Functions

Packet Switched StatMux

Moments

Packet Switched StatMux

1995 OSU Backbone Packet Histogram

2004 OSU Backbone Packet Histogram

IM Traffic Message Size

255 point zero mean discrete time
White Noise waveform
(Adjacent points are independent)

Autocorrelation Estimate
of zero mean
Discrete Time White Noise

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

Slide 17