Hello. First time poster and network newbie. I have a question about Poe. I have the linksys WRT3200ACM and a Cisco WS C3560X-24P-L switch. In theory, shouldn’t I just be able to enable Poe on a particular port on the Cisco switch and then plug an Ethernet cable from that port into the Ethernet port on the linksys router and it should work? I know linksys sells a Poe adapter, but that seems like that is for switches that do not have Poe capabilities. Am I correct?
Linksys and Cisco switch poe
- Thread starter skadoo35
- Start date
A PoE switch uses 802.3at/af to provide the power. This is a active protocol, just turning it on in the switch just allows the device to request it but it does not provide power unless it is requested.
The end device must also support 802.3af so it can request the power. This is not common on a router but it is common on a AP or many IP phones.
There are other things called PoE that are proprietary and use custom power injectors. This should not really be called PoE to avoid confusion since it pretty much only works with the companies adapters. There are no switches that support these custom PoE implementations.
The end device must also support 802.3af so it can request the power. This is not common on a router but it is common on a AP or many IP phones.
There are other things called PoE that are proprietary and use custom power injectors. This should not really be called PoE to avoid confusion since it pretty much only works with the companies adapters. There are no switches that support these custom PoE implementations.
My guess is it won't work. The power supply on that router is 36watts. That is far above any PoE device. The wires are just too small to carry that much power especially if you need to go any distance.
I would look at actual AP, ubiquiti sells many devices.
I would look at actual AP, ubiquiti sells many devices.
That is total output power running multiple ports. The switch supports the newer AT PoE standard the most it can put out is 25.5 watt on a single port. You are also going to get some loss converting from PoE voltages of 48volts to the 12 volts the router needs so you would need more the 36watts of PoE power.
There is some discussion of a new form of PoE coming out in the next couple years that puts out more power but the main problem is the size of the wires.
There is some discussion of a new form of PoE coming out in the next couple years that puts out more power but the main problem is the size of the wires.
alceryes
Splendid
- Jun 11, 2004
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Okay.
Irregardless of PoE specs, combined wattage, etc., a device needs to be 'capable of' (have the internal wiring for) being powered over an ethernet cable.
The router you mentioned (WRT3200ACM) does NOT have that capability. Therefore, it must be powered using a standard power adapter with the voltage, amperage, and polarity that it was made for.
Plain and simple. End of story.
Irregardless of PoE specs, combined wattage, etc., a device needs to be 'capable of' (have the internal wiring for) being powered over an ethernet cable.
The router you mentioned (WRT3200ACM) does NOT have that capability. Therefore, it must be powered using a standard power adapter with the voltage, amperage, and polarity that it was made for.
Plain and simple. End of story.
That is true but he later changed his plan to use a power converter that took PoE power and output simple 12volts. You technically can power anything over PoE that is low enough wattage and takes the correct voltage. Not a recommended thing but it is technically possible when you have low power equipment.
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