Thanks guys, I'll start playing tonight.
On Wed, May 29, 2013 at 5:48 PM, Sameer Verma <[email protected]> wrote: > On Wed, May 29, 2013 at 3:26 PM, James Cameron <[email protected]> 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 > > [email protected] > > http://lists.laptop.org/listinfo/server-devel > > > > > -- David Farning Activity Central: http://www.activitycentral.com
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