Title :
QoS evaluation of a voice over IP network with video: A case study
Author :
De Cristofaro, Nick ; McGill, Geoff ; Sallahi, Afrim ; Davis, Matt ; Alsibai, Alla ; St-Hilaire, Marc
Author_Institution :
Sch. of Inf. Technol., Carleton Univ., Ottawa, ON
Abstract :
In this paper, we evaluate the effect of different queueing disciplines and different codecs on a voice over IP (VoIP) network with video (also known as video conference). A real network topology is implemented using Cisco equipment. Experimental results show that low latency queueing (LLQ) and AutoQoS can provide significant improvements over FIFO in terms of delay, jitter and reserved bandwidth for a VoIP call with video. As far as codecs are concerned, they are suitable for different scenarios. It´s for certain that G.729 helps when low bandwidth is a must but, without any QoS parameters in place, codecs do not make a good enough difference for acceptable call quality on a congested network.
Keywords :
Internet telephony; quality of service; queueing theory; telecommunication network topology; teleconferencing; video communication; AutoQoS; Cisco equipment; QoS; VoIP; codecs; low latency queueing; network topology; queueing discipline; video conference; voice over IP network; Bandwidth; Codecs; Computer aided software engineering; Delay; Information technology; Internet telephony; Jitter; Network topology; Quality of service; Videoconference; Voice over IP (VoIP); case study; codecs; quality of service (QoS); queueing mechanisms; video conference;
Conference_Titel :
Electrical and Computer Engineering, 2009. CCECE '09. Canadian Conference on
Conference_Location :
St. John´s, NL
Print_ISBN :
978-1-4244-3509-8
Electronic_ISBN :
0840-7789
DOI :
10.1109/CCECE.2009.5090139
