Why do some ISP's have bandwidth quotas?

Ron da Silva ronald.dasilva at twcable.com
Fri Oct 5 13:25:30 UTC 2007



On 10/5/07 5:28 AM, "michael.dillon at bt.com" <michael.dillon at bt.com> wrote:
>> And before anyone accuses me of sounding overly critical
>> towards the AU ISP's, let me point out that we've dropped the
>> ball in a major way here in the United States, as well.
> 
> We've dropped the ball in any place where the broadband architecture is
> to backhaul IP packets from the site where DSL or cable lines are
> concentrated, into an ISP's PoP. This means that P2P packets between
> users at the same concentration site, are forced to trombone back and
> forth over the same congested circuits. And P2P is the main way to
> reduce the overall load that video places on the Internet.

Michael - I don't think this is the case for most NA cable operators.  P2P
between subscribers in the same general area simply hairpins back over the
HFC from the aggregation hub (location of the CMTS), no unnecessary backhaul
to another distant PoP location.  Now, the rest of the traffic will be
aggregated further up on its way towards upstream peering...but that is a
different traffic flow.

-ron

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