I am installing a 7731, when I connect the 7731 device to the AP/BRIDGE port of the included POE injector, the red light on the POE injector turns off, and the 7731 does not get power. Any ideas?
I had similar issues. I ended up resolving my issue using PowerDsine 3501G midspans.
Now since I'm in Minnesota, I bought the PowerDsine 9000 series midspan so as to provide 802.3at power to enable the internal heaters if needed during the winter months.