Cisco Access Points require the power source as documented in the datasheets. This is what we built them for, what we test and what we support. By accident I powered the first CW9164I I got with 802.3af only and I got all kind of effects. Sometimes it powered and appeared to work, but I had all kind of issues with Wireless traffic. Sometimes it simply rebooted again and again. Sometimes it didn't boot at all. And sometimes it even appeared to work quite fine for some time. The not booting at all is the worst case that was called out in the installation guide. At the end it's an untested and unsupported setup. You really need to provide 802.3at to the CW9164I to get reliable results.
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