nanog mailing list archives
Re: What vexes VoIP users?
From: Scott Helms <khelms () ispalliance net>
Date: Wed, 02 Mar 2011 10:21:46 -0500
As I said, this second channel doesn't exist in almost all cases (its not cost effective nor needed in almost all cases). Having said that over the top VOIP providers do suffer in comparison because they don't get the benefit of prioritization in the local cable plant."Cost-effective"? Could you expand on how the provisioning of a second virtual pipe down the hill to a cable box has any incremental costs at all? Cheers, -- jra
Because it takes either another 6 MHz on the downstream side that could be used for a TV channel as well as 3.2 MHz (or 6.4 MHz for >=D2) on the upstream side. It also takes the CMTS interfaces, which are not cheap even with the advent of high capacity cards & QAMs for D3. On top of all this it also takes more time on the design and management side because you have to make sure all of your nodes are getting both sets of channels and you have to make sure your provisioning or CMTS config keeps the EMTA's on the right channels.
-- Scott Helms Vice President of Technology ISP Alliance, Inc. DBA ZCorum (678) 507-5000 -------------------------------- http://twitter.com/kscotthelms --------------------------------
Current thread:
- Re: What vexes VoIP users? Tim Franklin (Mar 01)
- Re: What vexes VoIP users? William Pitcock (Mar 01)
- Re: What vexes VoIP users? Jay Ashworth (Mar 01)
- Re: What vexes VoIP users? Scott Helms (Mar 01)
- Re: What vexes VoIP users? Jay Ashworth (Mar 01)
- Re: What vexes VoIP users? Michael Thomas (Mar 01)
- Re: What vexes VoIP users? Scott Helms (Mar 02)
- RE: What vexes VoIP users? Frank Bulk (Mar 01)
- Re: What vexes VoIP users? Scott Helms (Mar 02)
- RE: What vexes VoIP users? Frank Bulk (Mar 02)
- Re: What vexes VoIP users? Scott Helms (Mar 02)
- RE: What vexes VoIP users? Frank Bulk (Mar 02)
- Re: What vexes VoIP users? Scott Helms (Mar 02)
- Re: What vexes VoIP users? Jay Ashworth (Mar 01)
- Re: What vexes VoIP users? William Pitcock (Mar 01)
- Re: What vexes VoIP users? Valdis . Kletnieks (Mar 02)
- Re: What vexes VoIP users? Scott Helms (Mar 02)
- RE: What vexes VoIP users? Frank Bulk (Mar 02)
- Re: What vexes VoIP users? Jay Ashworth (Mar 02)