Traffic characteristics
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delay tolerance: defines the maximum delay an application can tolerate (we can wait 10 sec for an email, but not for video frame)
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response time : can an application experience variable delay and response time (jitter)? - like audio stream
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total capacity and throughput: capacity - actual amount of resources available across a given path (T1: 1.544 Mbps); throughput - measure how much data can be passed across a medium in a stated period of time (T1: 1.536 Mbps)
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