Billion UK Forum

In Telnet Data two sets of speeds are shown thus

Max: Upstream rate = 888 Kbps, Downstream rate = 9028 Kbps
Bearer: 0, Upstream rate = 888 Kbps, Downstream rate = 8242 Kbps

I hope this is not too trivial a question. I can see that the lower figures are actual sync speed, but what do the higher represent- especially the downstream rate? Why is it recorded, and how calculated? Does anyone know, please?

I think this is the 'Attainable Rate'

Can you/ anyone explain further please? Where does the ~8% difference come from? I have seen that figure on a steady sync can vary a bit.

magogman wrote:Can you/ anyone explain further please? Where does the ~8% difference come from? I have seen that figure on a steady sync can vary a bit.

Have a look at the following thread http://forums.thinkbroadband.com/genera ... -rate.html

Thank you for the link. I had noticed since the opening post that the higher figure does change frequently,the difference between the two becoming narrower at night, for reasons we know. One comment in the link

A No, it's if the target Noise Margin were lower.
Bheoretically yes, but how many lines would sync with the target noise margin set at 0db ? never mind hold a sync with a 0 db margin for any period of time
But the theoretical attainable rate also increases or decreases according to what the margin is showing

makes me wonder what worth there is in the statiistic, unless one figure is vastly varied over the other.

I shall be comforted with my sync 8242 kbps; att 45.5 dB; target snrm 3dB; distance (road) ~3 kms and not ry tweaking anything on basis of that theoretical max,