I see some reviews that complain this device only powers a single PoE pass through device, not 2.
If properly used, this device WILL power 2 PoE pass through devices if they each require less than 7W of power.
I used it to power 2 Ubiquiti UAP-AC-LR Access Points rated at 6.5W each, and it works great!
The confusion lies in that most people don't understand that they may have to configure the switch's PoE settings via its web interface. During power up, the switch checks the PoE end devices in ports 1-2. If both end PoE devices correctly identify themselves to the switch as Class 1 (4W) or 2 (7W), both PoE pass through ports will automatically work and power up 2 devices. Most PoE devices don't properly identify themselves, as this is an optional feature. If they don't properly identify themselves, the switch gives full Class 3 (15.4W) PoE power to port 1, and disables port 2 because there isn't enough power left to power a second device.
YOU CAN OVERRIDE THIS IN THE WEB INTERFACE as long as your end PoE devices don't require more than 7W of power each. To do this, you log into the switches web interface with IP 10.90.90.90 and password admin. You then find your way to the PoE configuration section and manually set both PoE pass through ports 1 and 2 to "Class 2" power limit. After this, both PoE pass through ports will work, with a max of 7W per port. Also, make sure that the primary PoE switch you have powering the DLink is 802.3at (PoE+) capable, as the DLink will need the full 25W from the primary switch to be able to pass through 7W to each PoE pass through device and power itself.
I hope this helps some people who think this device doesn't work, or who are trying to figure out how to make it work for the first time. It took me a bit of research to figure it all out, but it is well worth it. This is a great device if you have 1 network wire somewhere (such as an attic) but need to power 2 PoE devices of 7W or less.
Everything I wrote above is true, but I just wanted to update. Once installed onsite, with longer cable runs, it had problems powering 2x Ubiquiti UAP-AC-LR access points. Their specs show 6.5W max, but they appear to draw more. Under load with short (6') cable runs, they worked flawless. On site with longer cable runs (1x6', 1x75', and a 100' input cat6) they would shut off and restart when put under load. I don't discredit the switch for this, more Ubiquiti for under-estimating the max power draw. I did end up using the switch + 1 AP pass through powered by the cat6, and the other externally powered but linked to this switch for data. I am sure the switch would be fine to POE pass through 2 lower powered devices.
|制造商||D-Link Systems, Inc.|
|商品尺寸||27.94 x 17.78 x 4.45 cm; 1.32 公斤|