That isn't t568a...you can do that, but that's not a "standard" used by many cable manufacturers.
Josh Luthman 24/7 Help Desk: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Tue, Oct 6, 2020 at 11:14 AM Nate Burke <n...@blastcomm.com> wrote: > The Last batch I ordered from Monoprice had this pinout. So I just throw > one of these on the POE injector if I want to use a camibum POE to power a > mikrotik, or my Battery adapter on an old 450 radio. I thought I heard > somewhere that Part of GIGe+POE spec was that it had to be polarity > agnostic? > > > > On 10/6/2020 10:06 AM, Adam Moffett wrote: > > That would be unusual for a crossover adapter to swap the 4,5 and 7,8 > pairs. Traditionally they swapped 1,2 and 3,6 for the benefit of 10/100 > devices that didn't support auto MDI-X. I don't think there's any context > where swapping the spare pairs would have been useful. In telephony you > might encounter a rollover adapter, but that's a horse of a different color. > > What I'm wondering is whether "power pairs" is even a useful term anymore > or just a pointless thing to argue about. I know there's a long history in > WISP-land of the spare pairs on 100BaseT being used for passive PoE. But, > 450b like most modern devices, has gigE. Like all gigE devices, all pairs > carry data. Their official PoE adapter puts power on certain pairs, but > 802.3af/at has multiple power modes where power could be on different pairs > in different polarities. > > I think we're seeing more polarity agnostic devices because the gigE > chipsets have to have that. Maybe it's not that Cambium and Ubiquiti love > and protect us, but that Ethernet vendors have to consider the reality of > multiple cabling situations when designing PoE capable chipsets, and a > diode bridge on the DC input is the logical solution everyone came to > independently. So on modern PoE devices there are pairs carrying power, > but there are no more dedicated power pairs. Just a thought. > > > On 10/6/2020 10:43 AM, Nate Burke via AF wrote: > > Unless they've changed the product in the last couple years, these cross > the power pairs as well. <https://www.monoprice.com/product?p_id=5088> > https://www.monoprice.com/product?p_id=5088 > > On 10/6/2020 9:23 AM, Josh Luthman wrote: > > a) cross over cable switches the data pairs, not the power pairs > b) a 450b accepts both polarities for voltage > > Josh Luthman > 24/7 Help Desk: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > > On Tue, Oct 6, 2020 at 10:21 AM Matt <matt.mailingli...@gmail.com> wrote: > >> I just found this: >> >> https://mikrotik.com/product/mqs >> >> I assume I can just use a crossover cable to power up a PMP450b. >> Anyone used them? I am not sure we need the wifi, our SMs are >> pre-programmed to lock on the tower. >> >> On Mon, Oct 5, 2020 at 9:28 AM Matt < <matt.mailingli...@gmail.com> >> matt.mailingli...@gmail.com> wrote: >> > >> > What is everyone using to power up an SM for site surveys nowadays? >> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > > > > > > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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