🚀 go-pugleaf

"Randy S." wrote:
> 
> > Even though bandwidth between the DSLAM and aggregation router is
> > assymetric (e.g. 45Mbps full-duplex), you could still saturate upstream
> > before downstream, depending on what users are doing.
> 
> I assume you meant SYMMETRIC here?  ;-)

yeah...ooops.


> 
> I think I was describing essentially the same thing before (at least that's
> what I was TRYING to say).  But as you say, I don't think this would be very
> likely on DSL.  I think John is saying that this is MUCH more likely to happen
> on Cable due to the shared ASYMMETRICAL upstream channel.  At least by the time
> the DSL upstream channel is shared, it's symmetrical.

In general I agree, but I'm trying to avoid making conclusions based on
speculation.

What I think this all comes down is NOT that all aspects of cable
infrastucture are shared and all but ONE of ADSL infrastructure is
shared.  Rather, when you compare the same layers of both how much
upstream sharing and how much downstream sharing is going on?

 
> I wonder if any Network engineers responsible for backbone maintenance are
> reading this.  I bet their blood pressure just went up! ;-)

Worse yet folks at ATT that concluded that cable is best architecture
for broadband deployment and bet their business on massive
acquisitions.  I may be wrong here, but I think in 2-3 years we'll see
that was a $100B mistake.  How many DSL customers (and how much
effective bandwidth) could you reach for $100B?  AND, most importantly,
how does it scale from there.


Come on, where are the cable infrastructure engineers...I don't pretend
to understand that side of the house...I be happy for someone to prove
me wrong since my first broadband access option could very well be ATT
Broadband.


-- 
-------------------------
Lawrence Baldwin
Protocol Scientist
678-624-0924
http://www.mynetwatchman.com - I'm under attack, now what?