Sorry for the late reply. It stormed here today and I was busy watching all the equipment. No we currently do not do any caching.
Sent from my iPhone On May 20, 2010, at 7:13 PM, "Tom DeReggi" <[email protected]> wrote: > Depends whether you are asking me or Jeremie. > > We dont use caching to save upstream badnwidth, currently. The > reason is > that our upstream transit costs are way less expesnive than our last > mile > and transport costs. > At one point, I calculated our unlicensed transport costs to be > close to > $180 per mbps (inlcuding colo/roof leases), but our transit costs at > the > same time averaged under $10/mb. (actually down to $3/mb now all > costs > factored). > Now, this is all changing, as we add more licensed higher capacity > backhauls > and higher capacity last mile. Today my last mile/transport costs > are much > much lower, but I haven't calculated that recently. > Caching would not have saved us money or prevented bottle necks for > download > traffic. However, it very well could save us money caching our > customers > on-net web servers, reducing last mile traffic. > Obviously, it would be the opposite situation for other WISPs that > had high > transit/transport costs and low last mile costs. > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > > ----- Original Message ----- > From: "Glenn Kelley" <[email protected]> > To: "WISPA General List" <[email protected]> > Sent: Thursday, May 20, 2010 11:51 AM > Subject: Re: [WISPA] Bandwidth > > >> Well Put. >> >> Have you guys thought about - (sorry jumping in the back end here) >> adding squid or caching? >> >> I have seen some major drops on bandwidth when caching is put in >> place >> - up to 30+% >> >> On the other hand - squid is not a replacement for the additional >> bandwidth. >> >> >> On May 20, 2010, at 10:43 AM, Tom DeReggi wrote: >> >>> For Ethernet colision detection type networks, you are correct. >>> That is what many WISPs forget when deploying PtMP. They incorrectly >>> think a >>> CDMA 25mb link will double their 10mb TDD link as they scale. They >>> learn >>> that as customer get added, the capacity is not nearly as much as >>> they >>> thought.. >>> >>> But with Ethernet backbones it does not always work the same, for >>> two >>> reasons.... >>> >>> 1) There is only one end device, so its not possible for collisions, >>> and >>> collision avoidance algorythms aren't really needed. >>> 2) If using TDD Ethernet, transmits are scheduled, without the >>> typical >>> overhead of Ethernet. >>> >>> I can run successfully run a bandwidth test of 95mb over a 100mb >>> Cogent >>> fiber circuti, and with a Tlink-45 set 36mbps mod, tested to pass >>> 30mbps >>> with radio tests, I can count on passing 30mbps through it. >>> So again, it comes down to the design and technology of the >>> backbone. >>> >>> Tom DeReggi >>> RapidDSL & Wireless, Inc >>> IntAirNet- Fixed Wireless Broadband >>> >>> >>> ----- Original Message ----- >>> From: "Scott Reed" <[email protected]> >>> To: "WISPA General List" <[email protected]> >>> Sent: Thursday, May 20, 2010 11:08 AM >>> Subject: Re: [WISPA] Bandwidth >>> >>> >>>> Old rule of thumb for Ethernet, because it is based on collision >>>> detection, is 70-75% is the max you want. Above this and >>>> collisions >>>> often become an issue. I assume the same is true for the faster >>>> links >>>> as well. >>>> >>>> Jeremie Chism wrote: >>>>> At what percentage of your backbone usage do you look at adding >>>>> more >>>>> capacity. At peak times I run at 65-70 percent of capacity. Just >>>>> looking for suggestions. >>>>> >>>>> Sent from my iPhone >>>>> >>>>> >>>>> --- >>>>> --- >>>>> --- >>>>> --- >>>>> --- >>>>> ----------------------------------------------------------------- >>>>> WISPA Wants You! 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