Search:  

 
 
   All ForumsHot TopicsGallery






how-to block ads


 
Forums » 20% of Comcast Users To See DOCSIS 3.0 in 2008 » useless...
Share Topic:
RSS topic:
toggle:
flat / full
normal / watch
Post a:
Post a:

Ignite
Premium,VIP
join:2004-03-18
UK
clubs:
·BlueYonder Interne..
·Be There

Re: useless...

said by tmc8080 See Profile :

said by a333 See Profile :

DOSCIS 2 shares the 50 megs among like 50 users, so comcast cant use it to offer those speeds to each and every sub. Now, hopefully, with channel bonding and the rest of it, DOSCIS 3.0 should be able to make those speeds possible.
Actually the node shares a few hundred megabits (100-400 depending upon how many subscribers per node (24-50), which could be *split* to accommodate the greater speeds.
Actually Comcast themselves say their average node size is over 450 homes passed and they certainly don't have several downstreams. You can have a vague guess by the different downstream frequencies seen on plant of the same origin but it's certainly not going to be the 10 needed to get close to 400Mbit to a single node.

Even then as the downstreams are not bonded on this gear the maximum available to a single modem is 38Mbit. This is not a limitation of the modem alone but also of the CMTS. The downstreams are discrete and modems contend for bandwidth on each channel not on the entire bandwidth. In at least some areas Comcast use the uBR 7246VXR so can't offer more than 2 downstreams to a node anyway.

50 per node is not a very high node ratio at all. There will be virtually no nodes at all which carry under 50 subscribers. Those nodes that do carry 50 subscribers are probably combined with others as there is no need at all to have nodes that small. a 50hp node is not a node it's FTTK.
Forums » 20% of Comcast Users To See DOCSIS 3.0 in 2008


Sunday, 29-Nov 06:01:20 Terms of Use | Privacy Policy | Hosting by www.nac.net - DSL,Hosting & Co-lo | feedback | contact
over 10 years online! © 1999-2009 dslreports.com.
page compression OFF
Most commented news this week
· [122] Time Warner Cable Fires Broadside At Broadcasters
· [112] New AT&T Ad Campaign Hits Back At Verizon
· [96] Apple Joins AT&T Verizon Snark Fest
· [87] New Bill Takes Aim At Higher Verizon ETFs
· [80] TiVo Sees Record Customer Losses
· [73] Weekend Open Thread
· [72] Verizon CEO: Hulu Will Be Dead Soon
· [69] In-Flight Internet Headed For Bumpy Landing?
· [62] Thanksgiving Open Thread
· [40] EFF Wages War On Fine Print
Most people now reading
· DIR-655 New Beta 1.32b09 [D-Link]
· ToC 4th boss - Preliminary Strategy for Twin Valkyr [World of Warcraft]
· Microsoft Security Bulletin Summary for October 13, 2009 [Security]
· Shareport problem on DIR-655 [D-Link]
· Windows 7 driver for the 2wire wireless adapter? [AT&T U-verse]
· 3.x Feral Druid - Bear Tanking Guide [World of Warcraft]
· Child Porn Laws - The Traci Lords Argument [Canadian Chat]
· [Tomato] WRT54-GL LCP appears to be disconnected - VOIP with Int [Linksys]
· Windows 7 boot manager editing questions [Microsoft Help]
· Blue Ray: Samsung BD-P3600 or LG BD390 [Audio/Video Chat]