ECEN4533 Data Communications
Lecture #32 4 April 2011
Dr. George Scheets

ECEN4533 Data Communications
Lecture #34 6 April 2010
Dr. George Scheets

ECEN4533 Data Communications
Lecture #35 8 April 2011
Dr. George Scheets

Slide 4

UDP Header

Sources of POTS delay

Sources of VoIP delay

Voice Quality vs. Bit Rate

Voice Calls: Trunk Capacity Limit
G.711 Example

Voice Calls: M2E Delay Limit
G.721 Example

Supportable VoIP Calls

Example VoIP Network

Voice Calls Possible Over an OC-12 Trunk
(G.729 Fixed Rate Coder)

Slide 14