North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: Why do some ISP's have bandwidth quotas?

  • From: Tim Franklin
  • Date: Mon Oct 08 08:35:45 2007

On Mon, October 8, 2007 1:06 pm, Roland Perry wrote:

> Surely the incumbent doesn't impose a cost on the bandwidth along the
> local loop - the bottleneck (and cost per gigabyte) is the backhaul from
> their locally operated DSLAM to the ISP's own network.

If you're buying wholesale from the incumbent, it's effectively the same
thing, as there's some kind of L2 connection per subscriber back to your
own network, so no possibility to talk to other local subscribers without
the hairpin.  (At least, I've yet to see such a thing in the offering from
any European incumbent.  I guess you could in theory with a virtual-router
or VRF per ISP on the incumbent's kit at the exchange, but that brings
other problems when you want to do things beyond basic Internet, e.g. VPN
or pseudowire services.)

Unbundling does change the model - renting just the metal path from BT is
not actually *that* horrific - but you then have to factor in your own kit
in the exchange.  That's not just cost, there's a big logistics piece -
and a lot of processes to change if you've built your business around