On Wed, May 29, 2013 at 3:26 PM, James Cameron <qu...@laptop.org> wrote: > On Wed, May 29, 2013 at 04:51:47PM -0500, David Farning wrote: >> Any thoughts on powering the AP? > > They are all different. >
Yep. The one we use in Bhagmalpur (India) and in Jamaica is the Ubiquiti Picostation2 unit that runs off a PoE injector. Ours run off 110/220V AC, but an AP that can run over 48V PoE can use a DC-to-DC PoE unit to power it from a 12V battery source. cheers, Sameer > First, select an AP that says it has a 12V input. > > I would record the voltage without load emitted by the power supply > supplied by the manufacturer. This is a known maximum voltage that > the AP can take. > > Then I would record the voltage on load. This is a known minimum > voltage. > > Then I would record the input voltage specifications of the access > point using the manufacturer's documentation. This is usually a > typical voltage, but sometimes they include a maximum or minimum. If > there was no documentation, I'd ask them, though perhaps with no great > expectation of success. > > Taking the minimum and maximum of those three values, I'd compare them > to the lead-acid battery charge cycle operating range of 10V to 15V. > > If there remains any doubt (e.g. they haven't specified a maximum), I > would attach the AP to a variable power supply and gradually ramp it > up to 15V, checking for sudden drop of current (a blown fuse), or > excessive operating heat. > > Once I'm happy, I would cut the cable as far from the device as > possible, and reterminate it there. Before cutting, I would discharge > the power supply capacitors ... saves wear and tear on wire cutters. > > If the AP was USB powered Wifi dongle, the problem goes away. > > -- > James Cameron > http://quozl.linux.org.au/ > _______________________________________________ > Server-devel mailing list > Server-devel@lists.laptop.org > http://lists.laptop.org/listinfo/server-devel > > _______________________________________________ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel