PoE to power a switch

You will find switches that can supply PoE and/or be powered through PoE from network equipment suppliers (such as Netgear and TP-Link). It is also possible to use a separate PoE injector for the supply. For switches/routers without the ability to be powered directly by PoE, a PoE splitter may offer an alternative solution. There are various voltage and current (and temperature) limitations that must be observed. Also, always check the building and electric safety regulations for your country.

Hello,

Could something like the TP-Link TL-POE200 adapter kit, or the TL-POE150S and TL-POE10R devices, possibly be what you are looking for? That kind of solution should allow the use of a "normal" switch at the receiving end (providing that the voltage and current ratings are within limits). Data sheets and user manuals downloaded from the TP-Link support site could perhaps be of help.

Do you already have a switch (on the sending side) that is capable of supplying PoE?

If not, if it is a standard router/switch (without the capability to output PoE), you would need a PoE injector there. At the receiving end, as I understand it, a "normal" access point, switch or similar device (without the capability to be powered from PoE) ought to be possible as well, if an appropriate PoE splitter is placed there (and if the splitter output voltage corresponds to the supply voltage for that switch, and if the current used by the switch is lower than the maximum current allowed for the splitter output). Just as an example of a setup, you may want to take a look at the picture on page 6 in http://static.tp-link.com/resources/document/TL-POE200_v2_User_Guide.pdf.

Since there were/are different PoE standards, and even pre-standards, it is important to check whether a (power sourcing) device would be compatible with a new powered device. Any information about the make and exact model/type of the switch that you have?

One advantage with an adapter kit, such as the TL-POE200 (which I have not tested), would be the known compatibility.

Eric,

I took a look at the ES-5800G V3 specifications and installation guide. Could not find anything about PoE, though. Was this the PoE switch mentioned in your earlier message?

On the other hand, the power requirements for the ES5800G V3 (5V and 1A) appear to be within the TL-POE200 (splitter, B) output range (see Appendix: Specifications on page 7 in the user guide above), should the same kind of switch be tested in a remote position. The switch that you referred to first (ES-3308P V3) has lower power requirements (5V and 0.6A), which should be even better for a remote switch (no mention here either about PoE).

According to a note on page 4 in the user guide, the injector (A) and splitter (B) in the TL-POE200 adapter kit are designed to work together (not to be used with other PoE devices).

Jan

Just found out that D-Link has a Gigabit PoE injector DPE-301GI and a Gigabit PoE splitter DPE-301GS (http://content.us.dlink.com/wp-content/uploads/2015/11/DPE-301GI-GS_REVA_DATASHE ET_1.00_EN_US.pdf). These appear to support PoE standards IEEE 802.3af / 802.3at. Could this possibly be of interest?

Good morning Eric,

The other (separate Gigabit) TP-Link devices TL-POE150S (injector) and TL-POE10R (splitter), mentioned earlier in my second post, do seem to be IEEE 802.3af compliant.

So, there are many options. Availability also appears to differ from country to country.

The cable length is one factor. Generally, by using a somewhat higher voltage between injector and splitter, the manufacturers can reduce current (and consequently the losses). Once at the splitter, the voltage is converted/reduced (for example, to DC 5 or 9 or 12V). Again, do check the local building and safety regulations before choosing a solution.

Jan