----- Original Message ----- > From: "Mikael Abrahamsson" <swm...@swm.pp.se>
> On Tue, 22 Jul 2014, Scott Helms wrote: > > > One of the main problems with trying to draw the line at layer 1 is > > that > > its extremely inefficient in terms of the gear. Now, this is in > > large > > part a function of how gear is built and if a significant number of > > locales went in this direction we _might_ see changes, but today > > each > > ISP would have to purchase their own OLTs and that leads to many > > more > > shelves than the total number of line cards would otherwise dictate. > > There are certainly many other issues, some of which have been > > discussed > > on this list before, but I've done open access networks for several > > cities and _today_ the cleanest situations by far (that I've seen) > > had > > the city handling layer 1 and 2 with the layer 2 hand off being > > Ethernet > > regardless of the access technology used. > > Stop doing PON then. Use point to point fiber, you get 40-48 active > customers per 1U. I'd imagine there might be newer platforms with even > higher densities. > > Yes, there are many examples of L2 being used but in order to deliver > triple play the L2 network won't be purely L2, also BCP38 needs it to > start doing L2.5+ functions, meaning it's harder to deploy new servies > such as IPv6 because now the local network needs to support it. > > It's cleaner just to do L1 and aggregate thousands or tens of > thousands of residential properties in the same place. I believe you've misunderstood Scott's point. The goal of layer-restriction is to encourage competition. The underlying goal is "reducing the barrier to entry of a new ISP". The less equipment such a new ISP has to provision, the lower that barrier is. If all you have to provision is a couple GE/10GE ports on your core switch, that's an order of magnitude easier than any type of optical termination equipment, for you as a potential ISP customer. To make this work, the fiber operator *has to make it easy for ISPs to become their clients* as well... Cheers, -- jra -- Jay R. Ashworth Baylink j...@baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://www.bcp38.info 2000 Land Rover DII St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274
