[SOLVED] Is the TL-SG1008P from TP-Link POE powered?

[siaan312]

I need a POE-Passthrough switch.
I only need 5 ports, only 1 of which has to be POE
Router, PC, 2 TVs, and a POE AP.

I know of the ubiquiti NS but it's only 4 ports and just isn't enough for me, Unless I can stack them, And the US-8 is just a tad bit too expensive.
There are some I saw on amazon from TrendNet that fit the bill, but I want to be able to buy them locally if possible.
Whenever I search up POE passthrough switch, the TL-SG1008P shows up, a cheap and easy looking switch, but what I want to know is if it's actually POE powered and Passthrough?
It does have a DC-in jack, but if I just run a POE injector into it, will that power it?

 

[bill001g]

So this is something I keep a bookmark to for someone that needs a cheap switch that can have 10gbit uplinks it also happens to allow PoE power but I don't think it can passthrough poe.
https://mikrotik.com/product/CSS326-24G-2SplusRM#fndtn-specifications

First you have to be very careful when you use the term PoE. There is the standard 802.3at/af and there is all kinds of proprietary passive stuff. The passive stuff you have to be very careful since they run at all kinds of different voltage levels.

This quickly gets into understanding the theories of wire sizes and current carrying ability. 802.3 based poe runs at 48 volts but that can damage equipment so it is a active protocol and only turns the power on for devices that can support it. Most the passive stuff runs a lower voltages which limits the distance but hooking it to equipment that does not support poe takes less chance of being damaged. The higher voltage lets it run more watts since the current is being limited by the wire size.

The key problem you have is say a poe port can put out 16watts of power. Now you hook a switch to it that only uses say 5watts. You now do not have enough power left to again put out 16watts of power. You would need 23 watts of power total input to a switch that can put out 16watts of power.

You might find a switch that can connect to a 802.3at power port that is rated at higher watts and then put out 802.3af which is rated at lower.

You are going to have to look around to see if someone actually makes this. Any form of PoE that is passive is going to be even more restricted because the lower voltages also reduce to total power you can pass though the wires.

 

[SamirD]

Whenever I search up POE passthrough switch, the TL-SG1008P shows up, a cheap and easy looking switch, but what I want to know is if it's actually POE powered and Passthrough?
It does have a DC-in jack, but if I just run a POE injector into it, will that power it?

I don't think so unless you have a POE splitter that will give the switch the 54v/1.3a it requires according to its power specs. It's definitely not a passthrough. As far as I know the ubiquiti ones are some of the only ones I've ever seen that can do that.

 

[siaan312]

So this is something I keep a bookmark to for someone that needs a cheap switch that can have 10gbit uplinks it also happens to allow PoE power but I don't think it can passthrough poe.
https://mikrotik.com/product/CSS326-24G-2SplusRM#fndtn-specifications

First you have to be very careful when you use the term PoE. There is the standard 802.3at/af and there is all kinds of proprietary passive stuff. The passive stuff you have to be very careful since they run at all kinds of different voltage levels.

This quickly gets into understanding the theories of wire sizes and current carrying ability. 802.3 based poe runs at 48 volts but that can damage equipment so it is a active protocol and only turns the power on for devices that can support it. Most the passive stuff runs a lower voltages which limits the distance but hooking it to equipment that does not support poe takes less chance of being damaged. The higher voltage lets it run more watts since the current is being limited by the wire size.

The key problem you have is say a poe port can put out 16watts of power. Now you hook a switch to it that only uses say 5watts. You now do not have enough power left to again put out 16watts of power. You would need 23 watts of power total input to a switch that can put out 16watts of power.

You might find a switch that can connect to a 802.3at power port that is rated at higher watts and then put out 802.3af which is rated at lower.

You are going to have to look around to see if someone actually makes this. Any form of PoE that is passive is going to be even more restricted because the lower voltages also reduce to total power you can pass though the wires.

I'm not following you 100% here, so I'll re-explain myself.
I have a coaxial connection in my house, meaning all the cables that run to each room are coax cables.
Because of that, my ISP put moca's all over my house, which are like, 2.5$ each per month, not a lot, but annoying nonetheless. It also cuts my gigabit connection to about 400 mbps, from the usual 850-950 I actually get on ethernet.
So, I decided to swap out all the coax going through my house with ethernet runs to eliminate said mocas since my ISP won't do it.
To do that, I need to run a switch inside of a little cabinet which houses all the coax cables and leads them to wherever they need to go.
That cabinet has no easy way to run power cables to, unless I ran a 10 meter 5V cable there, which would require soldering a connection and in general is not tidy. It's an option, but not a good one.
I also want to put in said cabinet my AC-AP-Lite access point from ubiquiti.
Because of these things, I want a switch that can be powered using the ethernet port (for tidyiness), and put out a charge using POE (for powering the AP in the cabinet).
The AP I am using uses 24 volt passive poe, but from what I read, the newer revisions of it can accept 802.3af, as of now I am unsure what revision I have, but ubiquiti does have an 802.3af to 24Volt passive adapter either way.
(Just checked while writing this, mine supports both 802.3af and 24Volt passive, says so on the back and from what I read anything after september 2016 is 802.3af compatiable, and mine was manufactured in november 2020.)
So all I was wondering, if there is a switch that I can power using just an ethernet cable, and that then could run 802.3af to atleast 1 more device.
I know ubiquiti has the US-8, but it's a little too expensive for me. They have the Nanoswitch, which is too small for me.
I was asking about the TL-SG1008P because when I searched up POE passthrough it showed up.
I only need a gigabit connection, and atleast for now, only 1 POE device.

 

[SamirD]

Why not just change the moca adapters to 2.0 bonded and get the full gigabit? problem solved.

 

[bill001g]

If you want moca you can get many of the 2.5g units for about $60. A very popular brand is gocoax. Their latest units even have 2.5 ports. The 2.5g is kinda a lie since that is the total shared network bandwidth between all units but the units easily get 1gbit for most people.

The problem you have.

So you take a switch that has poe in. 802.3af will provide 16watts of power. Now you subtract what the switch uses to function lets say 5 watts which is low. It now only has 11 watts of power to provide to another device. That is not enough to actually meet the 802.3af standard of putting out 16 watts of power. All depends on the switch, although it might work if you were to hook a AP to it that only needs 7 watts of power but it depends on if the switch even allows it.

 

[siaan312]

If you want moca you can get many of the 2.5g units for about $60. A very popular brand is gocoax. Their latest units even have 2.5 ports. The 2.5g is kinda a lie since that is the total shared network bandwidth between all units but the units easily get 1gbit for most people.

The problem you have.

So you take a switch that has poe in. 802.3af will provide 16watts of power. Now you subtract what the switch uses to function lets say 5 watts which is low. It now only has 11 watts of power to provide to another device. That is not enough to actually meet the 802.3af standard of putting out 16 watts of power. All depends on the switch, although it might work if you were to hook a AP to it that only needs 7 watts of power but it depends on if the switch even allows it.

My ap takes up to 6.5 watts, and am not planning to upgrade anytime soon.
Can you recommend me a switch that will do this exact function, and has 5 ports or more?