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According to RFC 1242 (Benchmarking Terminology for Network Interconnection Devices, July 1991), latency for store-and-forward devices is the time interval starting when the last bit of the input frame reaches the input port, and ending when the first bit of the output frame is seen on the output port. For bit-forwarding devices, latency is the time interval starting when the end of the first bit of the input frame reaches the input port, and ending when the start of the first bit of the output frame is seen on the output port. Variability of latency is called "jitter." See "Delay, Latency, and Jitter."
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