Forum Thread

Power router via POE switch?

row 1,923 1,778 January 6, 2016 at 10:42 PM
I recently got a hold of a used Archer C9 router, but it did not come with the original power supply. The router is 12V/3.3A and the AC adapter it came with is 24V/.8A. I'm assuming it's not safe to use the power supply. I want to use the router as an access point in my garage where I have a POE switch that powers my security cameras. Is it possible to somehow use the switch to power the router? If so, how and what do I need? I'm having trouble locating a 12V/3.3A power supply.

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#2
I don't believe any of the consumer Tplinks can use PoE for power. If the seller won't send you the correct adapter then just order a 12v/3.3A power supply off ebay and call it a day. Make sure the barrel connector is the right size.
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#3
Quote from row View Post :
I recently got a hold of a used Archer C9 router, but it did not come with the original power supply. The router is 12V/3.3A and the AC adapter it came with is 24V/.8A. I'm assuming it's not safe to use the power supply. I want to use the router as an access point in my garage where I have a POE switch that powers my security cameras. Is it possible to somehow use the switch to power the router? If so, how and what do I need? I'm having trouble locating a 12V/3.3A power supply.
I hope the previous owner never powered up the router with that power supply. If so it is likely toast.

I agree with brbubba here but faster is better than slower if you want to have a chance to return the router.
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#4
Quote from row View Post :
I recently got a hold of a used Archer C9 router, but it did not come with the original power supply. The router is 12V/3.3A and the AC adapter it came with is 24V/.8A. I'm assuming it's not safe to use the power supply. I want to use the router as an access point in my garage where I have a POE switch that powers my security cameras. Is it possible to somehow use the switch to power the router? If so, how and what do I need? I'm having trouble locating a 12V/3.3A power supply.

It doesn't need to be 12V 3.3A but rated for the power consumption. The two are somewhat analogous with the exception that the rating of the supply in power (W) must be at least what the device draws - it can be MORE. So 12V 3.3A is ~ 40W - if you can find a 12V PS that is rated for >40W that will work as well.

By POE switch you mean a POE splitter? You want to use the POE power to power the new router right?
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#5
Quote from dale_101798 View Post :
I hope the previous owner never powered up the router with that power supply. If so it is likely toast.

I agree with brbubba here but faster is better than slower if you want to have a chance to return the router.
The router works with the power supply that was included. After I noticed that it's 24v, I powered it off.

Quote from Dr. J View Post :
It doesn't need to be 12V 3.3A but rated for the power consumption. The two are somewhat analogous with the exception that the rating of the supply in power (W) must be at least what the device draws - it can be MORE. So 12V 3.3A is ~ 40W - if you can find a 12V PS that is rated for >40W that will work as well.

By POE switch you mean a POE splitter? You want to use the POE power to power the new router right?
I have a bunch of 12V 1A power supplies, but none that are 3.3A. All the 12V/3.3A on eBay look like notebook chargers with the brick in the middle. Assuming the barrel size is correct, are those ok to use?

Nope, it's a switch with 3 cameras connected. And yes, if possible, I'd like to power the router using that switch. Here's the exact one I have: http://www.amazon.com/Amped-Wirel...poe+switch.
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#6
Quote from row View Post :
The router works with the power supply that was included. After I noticed that it's 24v, I powered it off.



I have a bunch of 12V 1A power supplies, but none that are 3.3A. All the 12V/3.3A on eBay look like notebook chargers with the brick in the middle. Assuming the barrel size is correct, are those ok to use?

Nope, it's a switch with 3 cameras connected. And yes, if possible, I'd like to power the router using that switch. Here's the exact one I have: http://www.amazon.com/Amped-Wirel...poe+switch [amazon.com].
Generally speaking, as long as the voltage is the same you have some flex room on the amperage. If you are in a pinch I might go ~10-15% lower, but it's a slight risk. Going to 1A from 3.3A is a no no. Going higher though and you should be ok.
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#7
Quote from brbubba View Post :
Generally speaking, as long as the voltage is the same you have some flex room on the amperage. If you are in a pinch I might go ~10-15% lower, but it's a slight risk. Going to 1A from 3.3A is a no no. Going higher though and you should be ok.
Ok thanks. I think I remember seeing a 12V 4A at home. I'll try that.
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#8
Like others have said in this thread, your router needs ~40W of power - POE is generally limited to around 13W (yes, there are more expensive/exotic versions, I doubt your switch is one of them) - just to answer from the POE perspective
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#9
A power injector [veracityglobal.com]

It's a small device, Ethernet in, Ethernet out, power in, power out (over Ethernet cable to device). I used to use these regularly.
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#10
A replacement power supply for this router is being sold on Ebay for all of $9.99. I would just buy one and call it a day. Not worth trying to mix and match and find the right adapter with the right connector to save all of $10. If it is not worth spending $10 on, then it is time to get a new router. My 2 cents.

http://www.ebay.com/itm/for-TP-LI...ed3T6LHybg
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#11
Thanks all for the advice. Got my hands on a 12v 4a power supply and it's working just fine.
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