Does a PoE switch have to be at the end of a IP device?

[riahc3]

Horrible title so:

Does "1" work to power that PoE IP device?

Thank you

 

[ch33zw1z]

Scenario 1 will not work.

 

[RadiclDreamer]

I think what you are asking is if the POE client has to be plugged directly into a POE switch or can it go through a NON-POE switch in the middle.

The answer is no. POE relies on the switch device detecting a specific amount of resistance in the line going to a device, it has to be a directly connected, hardwired connection from switch to client device.

 

[alkemyst]

When you cross a non-POE boundary you will lose POE AFAIK.

Better title if you cross-post this to other network forums would be "Can a non-POE switch extend a POE boundary to a non-directly POE-switch connected device?"

 

[riahc3]

Perfect. Thank you.

 

[Michael]

I recently wired my house and have a "patch box" that acts as the master connection point for my 8 access points (can actually go to 16 as I put 2 ports in each room). Right now I run a cable from my cable modem router to a switch (non PoE) and then plug into the patch box. At the other end, if I need more than two ports, I have another switch plugged into the access port in the room.

From what I can tell, if I want to use PoE I can either put the power after the switch at the patch box and then all ports will have power. However, if I need to use a switch at the other side in the room the access port is in, in cannot use a non PoE port.

So my choices are basically put an injector in each room after the switch for the one of two devices or get PoE switches for each room instead of regular ones?

Any danger to devices that do not need or can use the power?

Michael

 

[imagoon]

I recently wired my house and have a "patch box" that acts as the master connection point for my 8 access points (can actually go to 16 as I put 2 ports in each room). Right now I run a cable from my cable modem router to a switch (non PoE) and then plug into the patch box. At the other end, if I need more than two ports, I have another switch plugged into the access port in the room.

From what I can tell, if I want to use PoE I can either put the power after the switch at the patch box and then all ports will have power. However, if I need to use a switch at the other side in the room the access port is in, in cannot use a non PoE port.

So my choices are basically put an injector in each room after the switch for the one of two devices or get PoE switches for each room instead of regular ones?

Any danger to devices that do not need or can use the power?

Michael

If you are using a PoE switch there is no problem with a non PoE device attaching to it. It only provides power on request per the 802.3af standard. If you use some of the cheap $3 "PoE injectors" that are nothing more than a 48V power brick tied to the Ethernet cables, then you may have issues as many of those provide power no matter what, and sometimes more than the 15.4w limit which can fry devices and cable.

 

[alkemyst]

If you are using a PoE switch there is no problem with a non PoE device attaching to it. It only provides power on request per the 802.3af standard. If you use some of the cheap $3 "PoE injectors" that are nothing more than a 48V power brick tied to the Ethernet cables, then you may have issues as many of those provide power no matter what, and sometimes more than the 15.4w limit which can fry devices and cable.

QFT...cheapie injectors and also poorly designed devices can be issues always.

The beauty of true POE across the campus (or home/business) is you take what you need and nothing is forced upon the end devices.