Correct. For those (who don¹tt already know) that are interested in learning about this, do some reading on Diplex Filters (http://en.wikipedia.org/wiki/Diplexer), which are used to ³split² the RF spectrum apart so that the lower portion and the higher portion can be amplified independently, before recombining the two portions. I believe this was done to accomplish unity gain in each direction independently.
Also, I¹d like to note that there have been a few comments in this thread that lead me to believe some folks are confusing asymmetrical routing paths with asymmetrical speeds. Don¹t confuse the two as they have nearly nothing to do with one another. -Josh On 3/2/15, 6:00 AM, "nanog-requ...@nanog.org" <nanog-requ...@nanog.org> wrote: >------------------------------ > >Message: 3 >Date: Sun, 1 Mar 2015 08:08:27 -0500 >From: Clayton Zekelman <clay...@mnsi.net> >To: Barry Shein <b...@world.std.com> >Cc: NANOG <nanog@nanog.org> >Subject: Re: Verizon Policy Statement on Net Neutrality >Message-ID: <32d3c16d-0f4d-45ba-99f8-d41fe23d4...@mnsi.net> >Content-Type: text/plain; charset=us-ascii > >Yes, so when cable modems were introduced to the network, they had to be >designed to work on the EXISTING infrastructure which was designed to >deliver cable TV. It's not some conspiracy to differentiate higher priced >business services - it was a fact of RF technology and the architecture >of the network they were overlaying this "new" service on top of. > > > >Sent from my iPhone > >>On Feb 28, 2015, at 10:28 PM, Barry Shein <b...@world.std.com> wrote: >>>On February 28, 2015 at 18:14 clay...@mnsi.net (Clayton Zekelman) wrote: >>>You do of course realize that the asymmetry in CATV forward path/return >>>path existed LONG before residential Internet access over cable >>>networks exited? >>You mean back when it was all analog and DOCSIS didn't exist? >>>Sent from my iPhone >>>>On Feb 28, 2015, at 5:38 PM, Barry Shein <b...@world.std.com> wrote: >>>>Can we stop the disingenuity? >>>>Asymmetric service was introduced to discourage home users from >>>>deploying "commercial" services. As were bandwidth caps. >>>>One can argue all sorts of other "benefits" of this but when this >>>>started that was the problem on the table: How do we forcibly >>>>distinguish commercial (i.e., more expensive) from non-commercial >>>>usage? >>>>Answer: Give them a lot less upload than download bandwidth. >>>>Originally these asymmetric, typically DSL, links were hundreds of >>>>kbits upstream, not a lot more than a dial-up line. >>>>That and NAT thereby making it difficult -- not impossible, the savvy >>>>were in the noise -- to map domain names to permanent IP addresses. >>>>That's all this was about. >>>>It's not about "that's all they need", "that's all they want", etc. >>>>Now that bandwidth is growing rapidly and asymmetric is often >>>>10/50mbps or 20/100 it almost seems nonsensical in that regard, entire >>>>medium-sized ISPs ran on less than 10mbps symmetric not long ago. But >>>>it still imposes an upper bound of sorts, along with addressing >>>>limitations and bandwidth caps. >>>>That's all this is about. >>>>The telcos for many decades distinguished "business" voice service >>>>from "residential" service, even for just one phone line, though they >>>>mostly just winged it and if they declared you were defrauding them by >>>>using a residential line for a business they might shut you off and/or >>>>back bill you. Residential was quite a bit cheaper, most importantly >>>>local "unlimited" (unmetered) talk was only available on residential >>>>lines. Business lines were even coded 1MB (one m b) service, one >>>>metered business (line). >>>>The history is clear and they've just reinvented the model for >>>>internet but proactively enforced by technology rather than studying >>>>your usage patterns or whatever they used to do, scan for business ads >>>>using "residential" numbers, beyond bandwidth usage analysis. >>>>And the CATV companies are trying to reinvent CATV pricing for >>>>internet, turn Netflix (e.g.) into an analogue of HBO and other >>>>premium CATV services. >>>>What's so difficult to understand here? >>>>-- >>>> -Barry Shein >>>>The World | b...@theworld.com | >>>>http://www.TheWorld.com >>>>Purveyors to the Trade | Voice: 800-THE-WRLD | Dial-Up: US, PR, >>>>Canada >>>>Software Tool & Die | Public Access Internet | SINCE 1989 >>>>*oo* >>-- >> -Barry Shein >>The World | b...@theworld.com | >>http://www.TheWorld.com >>Purveyors to the Trade | Voice: 800-THE-WRLD | Dial-Up: US, PR, >>Canada >>Software Tool & Die | Public Access Internet | SINCE 1989 *oo* > This E-mail and any of its attachments may contain Time Warner Cable proprietary information, which is privileged, confidential, or subject to copyright belonging to Time Warner Cable. This E-mail is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient of this E-mail, you are hereby notified that any dissemination, distribution, copying, or action taken in relation to the contents of and attachments to this E-mail is strictly prohibited and may be unlawful. If you have received this E-mail in error, please notify the sender immediately and permanently delete the original and any copy of this E-mail and any printout.
