On 2018-11-25 21:16, Mike Hammett wrote: > No, not new. No need to buy new switches when there are so many used > available (except for now needing 100G). Switches > have an extremely long life. I have a client that has 15 year old Foundry > switches that just work, though we're looking > to replace them to get some 10G ports. > > The pricing was part of my point. For years everyone says just skip 40G and > go to 100G. The price difference isn't that > much.... but it is. > > "Everyone just skipped 40G and went for 100G." Then why is there such an > availability of 40G switches? Obviously they > weren't skipped, but purchased and then later replaced. > > Looks like $280 for an LR4 40G and $800 for an LR4 100G. Still a premium for > 100G over 40G. > > > > ----- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com
Whole bunch of Apples and Oranges mixed here. * 40G in the ISP/Telco world is more or less non-existant. There was never a good uptake on any products aimed towards ISP/Telco that did 40G cost-effectively. This is partly because 40G was/is never a thing in the DWDM-world either. There was some STM256 built and some OTU3 built aswell but not nearly in the same density as 10G was and 100G is built today, it had a weird timing with being fairly close to 100G and abit to distant to cost-effective 10G so it never had any good usecase. So if you buy services from a Telco, its very likely that 40G handoff is the least preffered option for them. Or most likely not a option at all (like from every company ive been involved with) * You compare market-economics with what new stuff cost vs used stuff on ebay/liquidators cost. Thats not a sane way of doing math, the reason why old 10/40 nexus and arista etc is plentiful on ebay is because people switched it out to something newer, faster. There isn't currently anything faster on the market then 100G-switches so naturally there isn't much of that available used. Now that at least some product-families (spine switches) getting 400G with the new TH3-switches we can assume that there is a decent amount of older 100G spines getting decommisioned, and hence getting available in the second hand market (maybe even late next year). However there has been _a lot_ of datacenters being lifted from 10G/40G to 25/50/100G architecture the last year, so it makes sense that the predecessor is on ebay. If you are to buy *new* stuff id say that going for 100G of 40G architecture makes sense in almost every aspect, regardless of what products and usecase you have. If you rely on second-hand, then sure, 40G might be a decent choice. However i would cry if id have to buy 40G optics today since i know they be binned in a year anyway. (4x10G PIR is still usable optics in 100G land though). -- hugge
