Keith Lofstrom <keithl <at> kl-ic.com> writes: > > I fiddled a bit with the "Auxilliary Power Supply DC 12V" input to > my FIOS BBU. > > The barrel connector seems to be a 0.15 inch barrel (approximately > 6mm), center positive. I clipped the connector and cable off an > obsolete wall wart, and proceeded. This is the same power connector > as some of the older Nokia cell phones, IIRC. > > I set up a lab bench power supply with current and voltage limits, > and connected it to the cable. When I increased the voltage above > 12.5V , the "Auxilliary Power Source" light on the front panel lit > up. The BBU drew less than 10mA. I dialed it up to 13.5V, about > what a car battery puts out, and set the current limit to 5 amps. > Since the unit draws 20W from the line in normal operation, I > assumed that would be enough. > > I pulled the line power input to the BBU, the unit went on battery > as intended. I pulled the internal battery connection, hoping it > would use the auxiliary power instead of the internal battery, > and the BBU shut down, without drawing current from the auxiliary > jack and bench supply. It might have been a startup surge, so I > tried again with 0.086 farads across the supply. Again, shut > down, no current from the bench supply. I don't want to try a car > battery directly, too much current if something shorts. > > So - a mystery. Perhaps there is some protocol on the wire to the > approved external device. For extended life, use an external UPS > on the line input, I guess. > > Keith >
Do you know if the connector is a type M or N power plug? These are available at Radio Shack. Also we have noticed that the internet shuts down after 5 minutes and want to know if it continues automatically if it finds the aux. power is available. Did you try to leave the normal battery connecected and wait for longer than the 5 minute period to see if things stayed up? If not could you try that experiment. _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
