RARPSL
join:1999-12-08
Suffern, NY
| reply to Jerm
Re: uhh wtf mate!
said by Jerm  :DOCSIS 2.0 running QAM16 upstream (common configuration) would have 10mbps of upload bandwidth shared between all users on the "node". Go with 32-QAM, 64-QAM and 128-QAM and you get 3 times the bandwidth (30.72 [27] Mbit/s) to share. |
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lvlorpheus
join:2008-02-17
Eureka Springs, AR | reply to jester121
It's nice to see you agree with me. If our country can pump 12 billion a month in to Iraq it should be nothing to invest billions right here at home. |
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nasadude
join:2001-10-05
Rockville, MD
 ·Comcast
| reply to jester121
said by jester121 :.... Too bad that handling that sort of traffic requires thousands of multi-million dollar routing/switching platforms, and hundreds of very well paid engineers to manage them. Billions of dollars doesn't sound like an engineering challenge to me. Japan, France, S.Korea, etc etc have all done it or close to it.
You saying the U.S. is not as good or capable as them? |
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Jerm
join:2000-04-10
Richland, WA
| reply to jester121
Economically Feasible.
Think about it this way. Lets say for the sake of argument the current average cable modem upstream is 1mbit - Comcast is only at 768kbps for example and they feel the need to throttle torrents already.
Oversell ratio on residential lines is commonly in the area of 25:1 (25mbit sold to customers for every 1mbit of actual backbone bandwidth).
DOCSIS 2.0 running QAM16 upstream (common configuration) would have 10mbps of upload bandwidth shared between all users on the "node".
Do the math: This works out to a "node" with 250 customers that would share 10mbit of upload bandwidth. (25/1 oversell x 10mbps x 1mbps per customer)
The problem is in reality it only takes 10-15 users uploading at their full bandwidth to saturate the upstream - ruining the experience for everyone else.
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Now give everyone 100x the upload (100mbps) and the problem magically goes away?
Oh wait, whats that sound? I think it's Comcast sh**ting their pants! |
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jester121
Premium
join:2003-08-09
Lake Zurich, IL
 ·surpasshosting
 ·ViaTalk
| reply to Jerm
said by Jerm :If every customer had a 100/100 I have no faith in Comcast to engineer their backbone sufficiently to handle multiple customers uploading @ a full 100mbps. It just isn't feasible at this point in time. Yeah, it all sounds magically simple -- they should "engineer" their network to perform faster!
Too bad that handling that sort of traffic requires thousands of multi-million dollar routing/switching platforms, and hundreds of very well paid engineers to manage them. Billions of dollars doesn't sound like an engineering challenge to me. |
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