How can transmission errors in the last mile be detected? Experts in the field of telecommunications
measuring technology continually confront this question. Over the last 20 years, instrument manufacturers
have rolled out a wide range of mechanisms, counters and graphics for visualising errors
better and more rapidly on DSL. Up to now, the emphasis has been on ensuring that no packets are
lost on the DSL line segment. With initially 100 Mbit/s, the downstream Ethernet, which essentially
also constitutes the last mile, never used to be the bottleneck of the connection – but that is now

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