J D McDorce
Premium
join:2001-12-29
Westland, MI
| reply to Matisaro
Re: An online meter?
said by Matisaro  :
He uploaded 25 gigs, which is equvalent to downloading 350 gigs, check the thread and your sources.
How do you draw a equivalency comparison between upload and download? Due to characteristics inherent in the design of a DOCSIS cable internet system, uploading and downloading have entirely different potential effects on the local cable system (CM to CMTS). |
CCCMTech
Premium,VIP,MVM
join:2002-05-17
Pound, VA
| reply to averagedude
Maybe I just don't understand cable's reasoning but, users have their bandwidth hard capped at the modem to a set speed, lets say 3000/256.
Cable is shared in the neighborhood, sharing the connection. DSL has dedicated ATM circuits to the end users capping at the CO. We have sufficient bandwidth to the CO to handle the traffic our users generate... let's do some basics..
Figuring many companies use DS3s and OC3s we'll say cable is using a DS3/T3, that is 45 mbps. Ok, figuring at the max speed, 3 mbps, is would only take 15 simultaneous users to max out this connection. As much as they try, they will not download more than 3 mbps, legally.
Now DSL is shared at the CO and beyond so bandwidth still has to be balanced. So if we're offering the standard 1.5 mbps and using a DS3 it would take about 30 people to max us out at the CO. Considering many DSL users are going to 6 mbps it would only take about 7 people at 6 mbps. If we have more users than bandwidth your first hop pings start suffering because the CO is bottlenecking.
So why does cable have this problem and DSL doesn't? The only I can figure is, as I have said, we use multiple OC3s (~155 mbps usually about 3 OC3s or 465 mbps) where as most cable companies use 1 to 2 DS3s...in my area with adelphia, we're currently being powered by multiple T1s!
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