Re: Connecting 2 Wifi Networks Via Cantenna

On May 4, 5:07 pm, Jeff Liebermann <j...@xxxxxxxxxxxxxxxxxxxxxx>
wrote:


Chuckle. I think you'll find that the satellite uplink path is far
more oversubscribed than just 10:1.

........ If every customer started downloading simultaneously, each would get:
1.8Gbits/sec / 260,000 customers = 7Kbits/sec
which isn't going to work very well.


I forget exactly, but some of the sat experts have thrown around
similiar numbers. 5Kbits/sec per user is what stuck in my head.
Thankfully, most of the connections are idle most of the time.

The oversubscription rate would therefore be:
260,000 customers / 3600 customers = 72:1 oversubscription


Yep. Or more.

As they improve the ways that they can cram more data into the same
bandwidth they are certainly increasing how many they can get on each
transponder, although perhaps the effective contention ratio is
maintained or lowered. That's why they encourage subscribers to go to
the new HN7000S (previous was the DW7000). It doesn't actually
improve the subsciber's experience, but when pointed at the right
satellite running the new...protocol(?), it allows more to be packed
in. I forget the terms, something about slicing each rotation of
something into four parts instead of two or one. This is good for the
user simply because if Hughes can cram more on each transponder then
they can turn a decent profit and won't have to clamp down on
bandwidth instead.

One can imagine that it was easy five years ago to offer x amount of
thruput, knowing few would use it. But with P2P, youtube and itunes
type uses on the increase, they have to clamp down just to maintain
the same numbers of accounts.

I'm too lazy to do the upload numbers, but I suspect they're in the
same ballpark (or worse).



I've heard that upload is worse. Don't understand why. Probably just
because it's bandwidth that doesn't get noticed, therefore doesn't pay
off.


Steve


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