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On this The Tor Project webpage: https://www.torproject.org/about/jobs.html.en it is possible to read the following: "The Tor network's 6000 volunteer relays carry 48 Gbps for several million daily users".

What does 48 Gbps mean? I mean, is it the Data Transfer Rate of the Tor Network? Or maybe it is the bandwidth of the Tor Network? Or maybe it's something else ...

Could anyone tell me what does it mean? Thank you...

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It means the aggregation sum of all the speeds advertised+checked by relays. Of course it does not mean that you'll have it full just connecting to the network.

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    It's the measured throughput, the advertised capacity is actually much higher at over 200 Gbps as per metrics. – cacahuatl Feb 19 '17 at 21:43
  • Ok. So 48 Gbps is the measured throughput of the bandwidth of the Tor Network. Right? – NewUser Feb 20 '17 at 10:38
  • yes. Here how it works: a relay advertises it's speed - it can be whatever, even 1Pbps, but after that other nodes are starting to measure it by themselves in a distributed manner. And the consensus result of these metrics is the "relay speed" as it is considered by the network. An aggregate sum of these particular speeds is the number you're asking about. – Alexey Vesnin Feb 20 '17 at 11:28
  • Hmm, the bandwidth measurement is not that distributed. Though some non-dirauth relays could be participating in the process, dirauths control all these measurements. – nobody May 21 '17 at 9:00

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