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Author Topic: G.Fast - Understanding a difference of information between ISP and Openreach  (Read 3843 times)

re0

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  • Posts: 718

Code: [Select]
Max:    Upstream rate = 66064 Kbps, Downstream rate = 345788 Kbps
Bearer: 0, Upstream rate = 49871 Kbps, Downstream rate = 330011 Kbps

303139 (BRAS) / 0.88 = 344,476 (rounded)
330011 (sync (modem)) * 0.88 = 290,410 (rounded)
313174 (sync (user portal)) * 0.88 = 275,593 (rounded)
313174 (sync (user portal)) / 0.88 = 355,880 (rounded)

I have a feeling it is closer to 91-92% as opposed to 88%, since the first two calculations seem to make sense using that. I actually don't know the answer, but I would not be too surprised if G.fast needed a larger overhead for high INP.
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fat jez

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  • Posts: 42

Thanks for this. Makes you wonder if 330Mbps was chosen as the sync rate because it gives around 300Mbps after potential overheads?
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