Quote:
Originally Posted by Chrysalis
I meant not upgrading to reduce to that level but rather that original sales werent enough to get higher usage.
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You misunderstand how the network works. x customers are shared between y line cards. Where x is lower y is also lower to keep the number of customers per line card reasonable. There is no set formula for how many premises each line card covers, this varies depending on Virgin's needs.
They don't just throw in a line card for each 250 enabled homes and hope for good take up, the networks were originally thousands of homes passed per line card, even a 10% take up rate would have been ample to get 400 customers on a card.
---------- Post added at 15:59 ---------- Previous post was at 15:57 ----------
Quote:
Originally Posted by Chrysalis
why is legacy run at a different contention to the overlay network? thats an interesting one.
to me contention ratio is always relevent, its the ultimate measure of budgeted bandwidth. You said it yourself, the higher contention is only barely achievable due to STM and shaping been used to cut costs.
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To answer the first point that's easy, because the overlay network has far more bandwidth available. It can push 200Mbps to each fibre optic node while the maximum that the VXRs can push is 76Mbps.
As I mentioned contention ratio isn't relevant - that a ratio far higher than would be feasible is doable cheapens the value of that metric.
If you look at ISPs with strict caps and pay per GB overages they run on huge contention ratios because they can. Visible contention is what it's all about and is the only game in town. Whether the contention is made less visible due to a lower ratio, shaping, STM, whatever, that's the only valid metric.