This is a major issue and all you can do is plan for it. The stepdown from 48 to 24 or 18 is much less of a worry vs AC/DC - DC/AC conversion. The loss should be minimal, and transformers like this, should not fail often. They are simple devices and are relitivly cheap and replaceable.
I do understand, how easy it would be to use all 48 volt. We even had a number of requests for -48v Power Supplies in our PoweRouters. 12 volt is easy, the -48 it s a bit harder. Lots of telco rooms etc use these. Dennis Burgess Mikrotik Certified Consultant / Trainer www.linktechs.net WISP/ISP Support Solutions Home of the PoweRouter 732! Travis Johnson wrote: > Well, it seems a step backward to install a 24v to 48v converter and > thus add another point of failure, instead of just replacing the PoE. > > All of the new boards only support up to 28V, so unless you are going > to continue to find old boards on the used market, at some point you > will have to switch to 24V. > > Travis > Microserv > > Blair Davis wrote: >> 2 reasons.... >> >> I've made it a point to make all my tower equipment use the same >> power to eliminate the need to keep different spares on hand. At one >> time I had lots of different types of power supplies for different >> things. >> >> And it is much harder to kill equipment by accident if they all use >> the same power. >> >> one last thing... I've never had problems with voltage drop on a 48V >> system... no matter if the cable run is 50ft or 300ft. I remember >> having to pick the power supply vs the cable length before. This, to >> me, is a step backwards. >> >> I no longer replace just the board. I have a standard build of >> board, enclosure,static protection and so on... we just undo the >> u-bolts, disconnect the LMR and ethernet and swap. We never open the >> weatherproof enclosure in the air any more. >> >> >> Travis Johnson wrote: >>> You have to replace the board (which means a tower visit) so why not >>> just replace the PoE at the same time? >>> >>> Travis >>> Microserv >>> >>> Blair Davis wrote: >>>> My problems with the replacements is the power supply. >>>> >>>> I use only 48V POE for my towers... and most of the new gear is not >>>> 48V. >>>> >>>> So now I'm looking for small 48V to 24V DC-DC converters... >>>> >>>> >>>> >>>> Dennis Burgess - Link Techs wrote: >>>>> 3x is what is out. The 133 and 133c's are EOL, as are the 532s, 150s >>>>> and for most part the entire 100 series boards. Figure you will have to >>>>> start using 400s, 300, and 600s. >>>>> >>>>> We do have new cases, nice hinged enclousers and build to spec our >>>>> routerboard series. These will fit the 333's without issues. We are >>>>> just getting ready to put up a dual-pol n-stream link with 600s, think 2 >>>>> foot on one side and 3 foot dish on the other. >>>>> >>>>> I'm sure we will post the information on our MT list... >>>>> >>>>> Scott Reed wrote: >>>>> >>>>>> I understand you don't want v3, but I have been moving to RB333s with >>>>>> 3.x and have had no issues at all. They boot faster and support more >>>>>> radios. RB600 uses same mounting holes and daughter cards. I have one >>>>>> 600 ready to install, but have none in production, yet. >>>>>> I put up a POP with 3 333s on 3RC9 and they are still running on RC12. >>>>>> I should get them up to 3.6 or 3.7, but that takes time. I have a 330 >>>>>> running 3.3 that is doing great as well. I have everything from a RB230 >>>>>> running 2.8.x to 532s running all sorts of 2.9 along with the 330s. >>>>>> At this point I think you are going to have to bite the bullet and start >>>>>> moving to 3.x and the newer cards. >>>>>> >>>>>> Mark McElvy wrote: >>>>>> >>>>>> >>>>>>> Since RB532s are no longer available, what is everyone using to replace >>>>>>> them? It would be nice not to have to replace the box again (using the >>>>>>> 7x6x2's from wisp-router) and I am not quite ready to run v3 on my >>>>>>> network. Any suggestions? >>>>>>> >>>>>>> >>>>>>> >>>>>>> Mark McElvy >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> -------------------------------------------------------------------------------- >>>>>>> WISPA Wants You! Join today! >>>>>>> http://signup.wispa.org/ >>>>>>> -------------------------------------------------------------------------------- >>>>>>> >>>>>>> WISPA Wireless List: wireless@wispa.org >>>>>>> >>>>>>> Subscribe/Unsubscribe: >>>>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>>>> >>>>>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>>> -------------------------------------------------------------------------------- >>>>> WISPA Wants You! Join today! >>>>> http://signup.wispa.org/ >>>>> -------------------------------------------------------------------------------- >>>>> >>>>> WISPA Wireless List: wireless@wispa.org >>>>> >>>>> Subscribe/Unsubscribe: >>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>> >>>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>>> >>>> >>>> ------------------------------------------------------------------------ >>>> >>>> >>>> >>>> -------------------------------------------------------------------------------- >>>> WISPA Wants You! Join today! >>>> http://signup.wispa.org/ >>>> -------------------------------------------------------------------------------- >>>> >>>> WISPA Wireless List: wireless@wispa.org >>>> >>>> Subscribe/Unsubscribe: >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>> ------------------------------------------------------------------------ >>> >>> >>> >>> -------------------------------------------------------------------------------- >>> WISPA Wants You! Join today! >>> http://signup.wispa.org/ >>> -------------------------------------------------------------------------------- >>> >>> WISPA Wireless List: wireless@wispa.org >>> >>> Subscribe/Unsubscribe: >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> Archives: http://lists.wispa.org/pipermail/wireless/ >> >> ------------------------------------------------------------------------ >> >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ > ------------------------------------------------------------------------ > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
