Quality of Service Overview Quality of Service is the term given to given data streams (more specificially IP packets) priority over a network (WAN, LAN etc.). The driving technology behind Quaility of Service is the introduction of Label Switching which allows the use of high speed ATM switches over normal IP networks.
IP RTP Priority The IP RTP Priority feature provides a strict priority queueing scheme for delay-sensitive data such as voice. Voice traffic can be identified by its Real-Time Transport Protocol (RTP) port numbers and classified into a priority queue configured by the ip rtp priority command. The result is that voice is serviced as strict priority in preference to other nonvoice traffic.
Indepth: Packet Loss Burstiness This paper outlines some key packet loss models, provides some analysis of packet loss data, discusses the degree of "fit" of models and data and proposes the use of a 4-state Markov model to represent loss distribution.
Indepth: Jitter Sources This contribution discusses the root causes and statistical characteristics of jitter, provides some practical measurement results and then discusses ways in which jitter can be measured and modeled. Finally the operation of jitter buffers is briefly discussed in order that the interaction between jitter and jitter buffers can be better understood.
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