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Possibly related: Ubiquiti used non-standard 24V POE for some devices. Plugging standard 48V POE into certain old devices could damage them, and 48V devices won
by cyounkins 5y ago
Possibly related: Ubiquiti used non-standard 24V POE for some devices. Plugging standard 48V POE into certain old devices could damage them, and 48V devices won't power on with 24V injectors.
- DaiPlusPlus 5y agoTo be fair, and AFAIK, I understand there was (and still is?) no ISO/IEC/IEEE standard for "dumb" PoE power, only "smart"/"managed" power. The rest of Ubiquiti's gear does use IEEE 802.x.
- myrandomcomment 5y agoThank you for sharing. Unfortunately this is not the issue. I wish it was that simple as they make an adapter for that.
- secureleaf 5y agoThis is true, although it's important to differentiate active and passive adapters. Ubiquiti sells some devices that are 24V passive PoE. These devices include their UISP products (such as devices like the AirMax). Passive injectors are dangerous because they always supply 24V to the port; this could damage a non-24V PoE device. There's also the 802.3a* standards family, such as the 802.3at (what Ubiquiti calls PoE+). Each of the standards (e.g. 802.3at, 802.3af, etc.) support different amounts of current, but they're all 48V active adapters. Active PoE is safer because the device "requests" the power it wants; the switch does not always supply 48V power over the port, so devices that don't require PoE won't be receiving power. Ubiquiti sells a few switches that support both 24V passive PoE and 48V active PoE. You can change this in the switch's web interface, through the port settings. You may also want to consider just using a 24V passive injector, especially if your switch cannot be configured to supply 24V power.