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packet delay variation
In computer networking, packet delay variation (PDV) is the difference in end-to-end one-way delay between selected packets in a flow with any lost packets being ignored.〔RFC 3393〕 The effect is sometimes referred to as jitter, although the definition is an imprecise fit.
==Terminology==
The term PDV is defined in ITU-T Recommendation Y.1540, (Internet protocol data communication service - IP packet transfer and availability performance parameters ), section 6.2.
In computer networking, although not in electronics, usage of the term jitter may cause confusion. From RFC 3393 (section 1.1):
The variation in packet delay is sometimes called "jitter". This term, however, causes confusion because it is used in different ways by different groups of people. ... In this document we will avoid the term "jitter" whenever possible and stick to delay variation which is more precise.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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