Quote:
Originally Posted by Ignitionnet
5:2 is actually about right - people seem to start losing upstream when their downstream drops below ~60Mb so it seems to be around a 3:1 ratio.
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Strictly speaking I was talking purely about the bandwidth allocation at the VDSL layer, on my ECI cab that's almost exactly 5.02:2.
Mind you, I've seen quite large differences from cab to cab, for example max of 82/30 on one line and 108/28 on another.
Quote:
When I was the only connection live on the FTTC cabinet, the stats were:
Max:
Upstream rate = 29421 Kbps
Downstream rate = 98020 Kbps
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Not too shabby, though my line is like that when the cab's at 100% capacity
---------- Post added at 11:28 ---------- Previous post was at 11:26 ----------
Quote:
Originally Posted by Kushan
My experience with DSL has always been the same, upstream seems fairly resilient while downstream tails off quickly.
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With ADSL(2) that's to be expected, upstream always uses the bottom-most frequencies which have the longest range and least attenuation. Downstream uses everything above the bottom few percent, so degrades more quickly. Bit like cable really.
VDSL(2) works differently, in that the downstream and upstream are interleaved, there's just such a huge overall bandwidth that using a fixed low/high split isn't effective.
---------- Post added at 11:31 ---------- Previous post was at 11:28 ----------
Quote:
Originally Posted by OhReally
THIS.
Imagine if VM sold electricity
"you will get up to 240 volts"
You switch on your tv and nothing happens as you are only getting 60v today, the network is "too busy"....try watching it at 4am instead  |
Imagine if that's actually how the real world worked. OH WAIT, IT IS.
You get
nominally 240 V RMS, actually it varies from -320 to +320V every second but ignoring that, you are not guaranteed 240V. The target is 240V +/- 10% but can easily be as high as 265V or as low as 220V during normal operation. During busy periods you get brownouts and sometimes you get complete cutouts.
Perhaps you're a bit spoilt where you live but there are plenty of places in the world where electricity cuts out several times a day and always browns out during peak periods.