StarTech.com 4-Port Multi-Gigabit PoE++ Injector, 5/2.5/1G Ethernet (NBASE-T), PoE/PoE+/PoE++, Wall/DIN Rail Mountable 802.3bt 90W

小型で使いやすいですがACアダプターが大きい為 設置場所を考慮しなければならない

Works great! It is a very small unit since the power supply is separate. It is driving Aruba AP-215 access points just fine.

PoE給電対応機器の動作確認の為に購入しました。 購入後動作を確認し、正常にData&PWR側の全インターフェースで802.3af/802.3atでの給電が可能なことを確認しています。 電源は電源ケーブルとACアダプタがそれぞれ分かれているタイプです。 電源ケーブルはA/SE/BF/Oタイプの4本が同梱されています。 私は日本国内での利用なのでAタイプしか動作を確認していませんが、標準的な10A/125Vの電源ケーブルでした。 長さはACアダプタと合わせて計2m程度あり、電源ケーブル側の端子も小さい(一般的なサーバ用電源のような3ピン型)ので、密集し易い電源タップでの給電に適しているかと思います。 形状からHUBのように使用することもできるのかと思っていましたが、Data側とData&PWR側のインターフェースは番号毎に対になっており、異なる番号のインターフェースとは通信できないようです。 単に1ポートのPoEインジェクタが4つ連なったものと考えればいいのかと思います。 まだ購入したばかりなので耐久度合については不明ですが、とりあえず購入した目的通りには問題なく使用できそうです。

This review is for the 4 port standard gigabit POE+ injector. I received it for review through the Vine program, and it's being used to power a QSee IP camera. Let's start with what I don't like about this product. It's a fairly short list. Although it looks quite similar to an Ethernet switch, it is NOT a switch. There are 4 Ethernet ports on one side, and 4 PoE ports on the opposite side. To use a PoE port, you need to connect that port's corresponding Ethernet port to an Ethernet switch. This was a bit disappointing for me, as I mistakenly assumed that this is a 8 port gigabit switch with 4 ports powered. Instead, if you want to power 4 devices, you need to have all 4 Ethernet ports connected to a switch. Because this is not a switch that regenerates the Ethernet signal, total cable length from switch to device cannot exceed 100m (330 ft - twisted pair Ethernet limit). Next, we have a rather worrying piece of instruction with this. It states that devices on the PoE side should only be plugged in after power is supplied to the injector. It is easy enough to do when setting up, but what about if there's a power failure and I'm not around to unplug the devices? If it is important, then there should have been a relay inside the switch that enables the PoE ports a few seconds after power is applied. Having said that, I tried applying power with the PoE device attached and it appears to work fine. But the cameras don't draw a lot of power, way below what this is capable of supplying. Finally, minor quibble - there is only 1 indicator LED for each port indicating if a PoE device is plugged in. There's no LED to show if there is a link on the Ethernet side. Not a big deal, but having a link indicator would make it more convenient for troubleshooting. OK, on to what's nice. It comes with a big power supply, and 4 different power cables (US, UK, EU CEE 7/7 and Australia). Seems like overkill here, but it does mean that StarTech only needs one SKU to cover a very big market. The other end of the cable is IEC 60320 C13 - the same cable that almost all desktop computers use, so it's easy to replace in case you need a cable with a different length. Power adapter input is universal voltage, output is listed as 52V 2.5A. The injector itself is very compact and has a metal shell. It has 2 slots behind and can be mounted with the cables running horizontally or vertically. There's no provision to mount the power adapter. No mounting hardware is provided. There are no buttons, switches, or controls on the injector. Just connect the power and the Ethernet cables and you're done. One thing that I was concerned about is how much power it uses even when lightly loaded. Without any devices connected, my Kill-a-Watt reported a power draw of 1W. When I connect 1 camera to it, that went up to 5W. I'll continue some tests regarding power draw, but this simple test shows that it's not continuously drawing maximum power all the time. If all you need is to add a few PoE ports to your existing network, and you don't need additional ports on your switch, this is a great product.

I purchased one of these after some extensive research of different POE options. I need a 24 port switch, as I have 4x5 drops in my home, but I only needed three POE ports -- 1 for an Avaya 1X desk phone, and 2 for 2x Unifi UAP-AC Pro access points. I looked at everything from 24-port POE switches to using a separate cheap switch just for the POE, but trying to ensure I had enough power and supported 802.3af and 802.3at was tricky, so I decided on a midspan injector (If I'm going to have an injector, I only want _one_). This thing does the tricky wonderfully. It's simple -- just plug it in and then use the ports as labeled. The only thing that throws me a bit is that there's instructions to "plug in the power before adding devices to the POE ports" -- how would I do this during a power outage? Do they expect me to use a UPS so that it never power cycles, or to somehow force the device OFF after a power outage, so I can power it up with nothing connected? Maybe it just means the _first_ time? I did some tests, and it doesn't seem to be care if devices are already plugged into the POE ports, and it powers all my devices perfectly. So other than the weird warning, this thing rocks. It even came with wall mount brackets. I'd buy from them again, even if it's a little pricey. I prefer to have something that can safely power my devices and autodetect the appropriate power requirements, not just some pass through cheapo injector with very little smarts inside the device.