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来回通讯延迟Round-trip delay time),在通讯Communication)、电脑网络Computer network)领域中,意指:在双方通讯中,发讯方信号Signal传播Propagation)到收讯方的时间(意即:传播延迟Propagation delay)),加上收讯方回传消息到发讯方的时间(如果没有造成双向传播速率差异的因素,此时间与发讯方将信号传播到收讯方的时间一样久)。[1]

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