Quote:
Originally Posted by Chrysalis
ok but we know in le3 there is downstream congestion on legacy and even some on overlay albeit much less severe. its on at least 2 legacy ports as philce had it on legacy and I also had it on legacy. I expect many light takeup areas elsewhere in the country have much less than 300 per downstream as insufficent sales.
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You expect wrong
If there are light sales what's the point in spending money on hardware and resegmentation to leave all that capacity unused?
At one time 200+ modems per upstream wasn't uncommon when the speeds were lower, 5,000 cable modems on a single chassis not impossible. Where areas have light utilisation VM simply wouldn't have split them as much as heavier areas, so same kinda number of modems online just more homes passed per card.
Your area is the exception rather than the rule downstream, as you will have noted from the forums the overwhelming majority of issues are upstream.
Quote:
Originally Posted by Chrysalis
80:1 contention ratio is much higher than the amount I seen you post in another post, cant remember which site it was (think was tbb) and is quite a high number. Even on a large backhaul (eg. 1gigabit) that is high. We will disagree on if we think its reasonable, I have evidence to say it isnt in the performance we see here. Some VM areas have less than 50 on a downstream port.
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The 30:1 I mentioned was for overlay network.
Your issues are upstream related I believe? No idea what the ratio in your area actually is. Probably somewhat higher than the number I mentioned.
I would like to see these areas with 50 modems on a downstream port, they would be few and far between indeed. 50 on an upstream port for sure, 50 on a downstream not so much. Certainly last year most ports that I saw were running between 300 and 450 modems, I wouldn't be surprised if that were 150 - 200 now in most cases.
Reasonable contention ratios are as high as companies can get away with, they have become largely meaningless due to the various bandwidth reducing methods used. In VM's case shaping and STM are the big ones that allow the network to run at higher ratios than would normally be feasible.
Regardless the levels of contention operators run their networks at are generally obscene