[AUUG-Talk]: Documenting how ADSL modems work?
andrewr at iagu.net
Fri Sep 9 13:30:26 EST 2005
At 7:43 PM -0700 8/9/05, Michael Paddon wrote:
>I guess that there is no economic imperative for them to enable this
>functionality. After all, they would need to spend more on hardware and
>customers might settle for a slower link.
Actually, it's worse than that - there's economic imperative for them
*not* to. Most ISP's that charge per MB charge based on bytes
transmitted, which include headers that would otherwise be
compressed. This may not seem like much, but over a large ISP it can
add up to quite a bit of revenue.
This is why some ISP's preferred to deliver traffic over ethernet to
PPP - extra framing overhead! PPPoE is the best of all worlds for
them - maximise the framing overheads!
Was anyone else involved in the furore in University circles when
Telstra had just taken brought the AARNet network and they redefined
1MB from 2^20 to 10^6 because it increased their revenue by 4%?
You might be surprised how many ISP's calculate ADSL charging
including all the padding on the end of cells. Then again, maybe you
wouldn't be surprised. :-/
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