150W is pretty hard to deliver via CAT5. Each wire is rated at .577 amps. Ignoring other concerns, this means at 48V, you get about 25 watts with a bit of margin, per wire. If you are sending the power up on two pairs, and returning it on the other two, this means you only have about 100W total you can do via CAT5 (110W with no margin). To do over 100W you have to use something else for the return path, say the tower or a ground wire - in which case you could send 200W up a CAT5 cable and return it via ground.
Personally once you get that much power in a CAT5 cable it scares me. A LOT of voltage drop, challenges in injection methods, etc Most ethernet magnetics top out at about 25.5W for power on two pairs, and 51W for four. This also corresponds to the 802.3at spec. I guess if you're returning on ground, you can also get 102W. Right now I'm focusing on the <50W category (ok, maybe a smidgen more). -forrest On Sun, Oct 5, 2014 at 6:46 PM, Matt Jenkins via Af <af@afmug.com> wrote: > Exalt ExtremeAir Radios draw 135watt average over PoE. Telrad Radios we > use draw up to 150watt but usually around 120ish. > > > > Matthew Jenkins > SmarterBroadband > m...@sbbinc.net > 530.272.4000 > > On 10/05/2014 04:55 PM, Gino Villarini via Af wrote: > >> What radio needs 150w? >> >> >> >> Gino A. Villarini >> President >> Aeronet Wireless Broadband Corp. >> www.aeronetpr.com >> @aeronetpr >> >> >> >> From: "af@afmug.com <mailto:af@afmug.com>" <af@afmug.com <mailto: >> af@afmug.com>> >> Reply-To: "af@afmug.com <mailto:af@afmug.com>" <af@afmug.com <mailto: >> af@afmug.com>> >> Date: Sunday, October 5, 2014 at 7:14 PM >> To: "af@afmug.com <mailto:af@afmug.com>" <af@afmug.com <mailto: >> af@afmug.com>> >> Subject: Re: [AFMUG] PacketFlux Product Ideas >> >> This is actually in the category of what I'm expending a fair bit of R&D >> on right now. >> >> The challenge comes cost. 150watt per port is very expensive to do when >> factoring in the DC-DC conversion. 20W is easy. 50W is a bit harder. >> 150W gets very expensive quickly. >> >> As a result, I'm thinking somewhat modular, i.e. pick/choose. >> >> I also have to be mindful of the competitors in the space, in that I want >> to be different in the right ways. The power injection/switching space is >> quite crowded. >> >> -forrest >> >> On Sun, Oct 5, 2014 at 2:35 PM, Matt Jenkins via Af <af@afmug.com >> <mailto:af@afmug.com>> wrote: >> >> Our infrastructure sites look like this: >> >> Shielded Cables -> 8 or 24port shielded patch panel >> -> APC PRM24 with WB Surge Modules >> -> PoE Injectors >> -> Switch / Router >> >> PoE Injectors are attached to a Masterswitch. >> >> >> <pipe dream> >> I know this probably is not feasible but.... >> What I would REALLY like is an active PoE midspan injector (8/24 >> gigabit port). Something that does not require a site monitor (has >> web/snmp function built in). It takes AC power and can output DC >> to each type of device. This device would be software configurable >> for power type and has apc masterswitch functionality. It would >> need to support up to 150watt per port for WiMAX and Licensed Link >> Radios. It would need to support from 12vdc to 56vdc output. If >> there was a model that also supported power out to a few (4) AC >> outlets I wouldn't even need an APC Masterswitch. The goal is to >> replace all those PoE injectors which don't mount in a rack or on >> a din rail in a box. >> </pipe dream> >> >> >> >> Matthew Jenkins >> SmarterBroadband >> m...@sbbinc.net <mailto:m...@sbbinc.net> >> 530.272.4000 <tel:530.272.4000> >> >> >> >> On 10/05/2014 01:19 PM, Forrest Christian (List Account) via Af wrote: >> >> It's been (quite) a while since I sent one of these messages >> out to the list. >> >> With the release of all of our new gigabit injectors, it is >> time for me to decide which products will be next out the door >> at PacketFlux. >> >> We've got several products at various stages of completion, >> but almost all of them I expect to be very low volume projects >> - the type of products we complete just because they help fill >> out our product offering instead of expecting a lot of revenue >> from them. A couple of these have appeared on the website >> recently - I.E. a 2 Relay, 3 Switch module, and the >> voltmeter/shunt input modules. >> >> So, what I'd love to hear is some suggestions for products >> PacketFlux could build which would help you in your WISP. I'm >> particularly looking for products which if they existed would >> go at every one of your tower sites, or even better at every >> customer location. I know these product ideas exist out >> there, and I'd love to hear them. Feel free to throw ideas >> out which are outside of the narrow niche that you think of >> PacketFlux fitting into. >> >> One final note - there is always a query for an all-in-one >> tower device which includes some mixture of ac power supply, >> dc-dc conversion, battery charging/management, Ethernet >> switch, router, power injection, fiber conversion, etc.. I've >> heard those loud and clear and am aware of that desire. >> There's work being done in-house toward something like that, >> but there are many hurdles left to make it a reality. If >> there's a simplified version of this which would fit a >> specific, widespread, need I'd love to hear about it, but the >> idea of a device you put into your rack and it handles >> everything needed at a tower site is still quite a ways off >> for us. >> >> So, throw your best ideas out there... I'd love to take a >> couple and run with them. >> >> -forrest >> >> >> >> >> >> >> >
