Latency, jitter, Packet Loss 설명

Network/일반 | 2006/12/19 21:10 | adioshun
Latency, jitter, Packet Loss 설명


출처 : cafe.naver.com/asterisker


1. Latency --> is the time it takes for a data packet to make a round trip between the sending and receiving location.When the average latency of a VoIP connection is above 200ms, call quality suffers.  The best VoIP connections have latency under 80ms, Email and web access can gracefully  handle latency of 400ms

                     *  VoIP 서비스를 하기위해선 최소 80ms이하의 latency가 필요함.



2. jitter --> is the result of variance on latency between subsequent packets. For example, if you ping a network and get  results such as 90ms, 92ms, 89ms, the network is jitter-free or, to be exact, it has jitter of 3ms ( varuance  between 92ms and 89ms). But if your pins looked like: 50ms, 70ms, 190ms then your network has jitter of 120ms. jitter that exceeds 100ms degrades the quality of a VoIP call. Jitter under 50ms is gracefully handled by most IP  phone system

                * VoIP 서비스를 하기 위한 최소한의 jitter 값은 --> 50ms 이하임.



3. Packet loss --> occurs most commonly when an internet network is congested. Under such conditions, packets are often  simply discarded. TCP/IP automatically retransmits these lost packets, but VoIP-over-UDP will not. Packet loss will create "stuttering", or in extreme cases, "silent gaps" in your phone call.

                           * TCP/IP 프로토콜은 패킷을 잃어버리면, 재전송을 요구 할 수있느나, UDP 프로토콜은 그렇지 못하기 때문에 패킷 손실은 심각한 서비스 장애를 일으킬 수 있다. 예를들어, 띠엄띠엄 들린다던가, 심하면, 아예 않들릴수도 있다.


2006/12/19 21:10 2006/12/19 21:10
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