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001-es BibID:	BIBFORM062503
Első szerző:	Gál Zoltán (informatikus)
Cím:	VoIP LAN/MAN traffic analysis for NGN QoS management / Zoltán Gál
Dátum:	2009
ISSN:	0866-5583
Megjegyzések:	Strict requirement is emphasized regarding QoS guarantees of the NGN (Next Generation Network) networks today. DiffServ mechanism is applied mostly for classification of protocol data units of real time and conventional information streams in LAN/MAN environment. The dependence of VoIP traffic characteristics of the delay and the jitter sensitive IP telephony vs. voice codec applied can be considered an exciting scientific question. We analyze Ethernet traffic generated by G.711, G.723, G.728 and Wideband (G.722) voice codecs. The self similar, fractal and multifractal properties of popular TCP based services (http, ftp, telnet, etc.) in LAN/MAN environment is well known for several decades. In this paper, we study the effect of UDP based current voice mechanisms on self similarity of the Ethernet data traffic. UDP traffics of the IP phones are evaluated in congested and congestionless environment using sophisticated methods of entropy and wavelet analysis. A new and efficient evaluation method, named ON/(ON+OFF) transformation is applied for characterization of VoIP traffic.
Tárgyszavak:	Műszaki tudományok Informatikai tudományok idegen nyelvű folyóiratközlemény hazai lapban NGN TCP UDP codec QoS DiffServ self similarity wavelet fractal entropy
Megjelenés:	Infocommunications Journal. - 64 : 2 (2009), p. 22-29. -
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
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