[opendtv] Re: F.C.C. Is Deluged With Comments on Net Neutrality Rules
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 22 Jul 2014 02:00:12 +0000
Craig Birkmaier wrote:
> Sorry Bert, but these are not trade-offs. Mirrored edge servers take a
> load off of the WAN, but do not solve the QOS problem if the last mile
> cannot handle the number of streams, and QOS of those streams.
> Obviously this is dependent on the infrastructure of the ISP.
Craig, the only sentence that is relevant in the above is your last sentence.
You're throwing around terms without placing them in a context. Explain to me
how you think an ISP network is architected, and then maybe we can set straight
your misconceptions about "WAN" and "last mile."
> DSL is a dedicated link, so it can deliver good QOS,
That's nonsense. The DSL link is just the very last link in a long chain. At
the head of a DSL link is a multiplexer, DSLAM, which fans out to many DSL
links. Upstream of the DSLAM there's a lot of other ISP network, including
routers, with potential for congestion and consequent QoS issues.
"QoS," a term you bandy about, is managed in routers primarily, and some people
lazily use the term also for possibly prioritizing of queues in layer 2
switches. But that's really a misnomer, and there are no performance standards
for the latter.
So, in telco DSL nets, JUST AS in cableco nets, you want to have video servers
feeding high bandwidth content as close to the edges as possible, bypassing
many or most of those congestion points (routers). Once you're at the DSL link,
or in the passive part of the cable network, you're BEYOND anything that gives
you QoS knobs, Craig.
> Cable is limited by the number of customers on the neighborhood loop,
> and the number of downstream data channels they dedicate to that
> neighborhood.
Cable creates multiple passive networks, and each "neighborhood loop" gradually
passes fewer and fewer homes, Craig, as you need to provide more and more
bandwidth to each home. The fiber optic part of the neighborhood network is
ALSO a passive network, which ultimately ALSO has to pass fewer and fewer homes.
In both cases, edge servers bypass the parts of the network upstream of where
the servers are physically connected to. That's all that matters. If you can
bypass a lot of those core routers in the ISP network, the video streams won't
get in the way of the other streams, and vice versa.
> All services require a modem in the home.
What the heck does that have to do with anything?
Bert
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