Re: uhh wtf mate! - dslreports.com

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.
	to forum · permalink · · 2008-02-29 22:11:55 ·
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. ------------------------ 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!
	to forum · permalink · · 2008-02-29 17:32:18 ·


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