Re: Bridge for REMOTE OUTDOOR project.

cleo wrote:
> I'm trying to use wifi bridges to connect a seismic datalogger high on a
> cliff to a computer a half mile away in a valley. This has been
> successfully done with a colleague's equipment using Senao/Engenius
> NCB-????(indoor model). So just order the same thing, right? Well, I
> tried... and I got a device (NCB-3220) that uses 48Volts, not 12Volts,
> despite the Engenius spec sheet listing the device at 12Volts, but it
> came with an AC->48VDC adapter. This is useless... it is infeasible to
> drag 4 12V batteries up the cliff.
>
> Any suggestions?

Call the distributor where you got the equipment.

The Senao product data sheets aren't clear on just what it needs for
power. One sheet says it conforms to IEEE802.3af which is indeed 48
volts, but another sheet says 12 volts. With that said, I can't be for
sure what they are doing, but can give some ideas for when you call them.

Some products that claim "PoE" are really not true PoE. The power units
are nothing more than than a splitter box that pulls out the spare
pairs of the CAT5 cable and feeds 12 volts (typically) from a wall wart
power unit back to the device.

Other products do indeed use 48 volts. Typically there is a 120 VAC
power supply with 48 VDC out that is inserted into the CAT5 as described
above.