Quality-of-service in packet networks: basic mechanisms and directions
Computer Networks: The International Journal of Computer and Telecommunications Networking - Special issue on Internet telephony
IP QoS: Traveling in First Class on the Internet
IEEE Internet Computing
RSVP: General-Purpose Signaling for IP
IEEE Internet Computing
Internet telephony: services, technical challenges, and products
IEEE Communications Magazine
The IETF Internet telephony architecture and protocols
IEEE Network: The Magazine of Global Internetworking
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This paper deals with a Differentiated Services test-bed, developed in Alcatel Labs in order to evaluate and compare the performance offered by three different queuing policies, namely FIFO, Priority Queuing and Custom Queuing, when supporting Voice over IP traffic. A Premium class has been assigned to voice traffic, while Best Effort class traffics have been considered as disturbing traffic and they have been generated by means of suitable TCP and UDP software tools. Performance comparisons have been developed for the considered queuing schemes. In particular, Priority Queuing has resulted to be the best solution for Premium class quality in the developed test-bed. For this scheme a suitable analytical approach has been also proposed and validated by comparing analytical predictions with experimental results.