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What are POE port and devices

engr_joni_ee

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POE stand for power over ethernet. Is that new standard or the old one ? What is the pinout of POE port ? Is it only copper or also applies to fiber as well ?
In today's world we are used to listen 25 Gbps or 100 Gbps as high speed ethernet but I am not sure if they also have POE support or not. Kindly comment here.
 
As far as I know, POE can only manage 100Mb/s using two transmit and two receive wires, as is normal for 'low' speed ethernet. The other wires are used to carry power. Both blue wires for positive, both brown wires for negative.

Errmm.... electricty doesn't flow through fiber!

Brian.
 
Hi,

nothing to apologize.
I just fear that this is sending the wrong signal to people misusing a forum ... and supporting the laziness of people.
They ask the most simple questions without the tinyest effort to find out the answer on their own.
They expect "the helpers" to spend more time than themselves. They act as if their time is more worth than other people´s (your, mine ...) time.
I see this as a form of disrespect ... treating the volutary helpers as servants.

.. just my personal opinion.

Klaus
 
Thanks for comments. I have now read about POE using the following link and get some idea what it is and how it works.


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Power over fiber is possible, but there is no such standard for ethernet.
You can buy optically powered oscilloscope probes with 85 kV common mode voltage and up to 180 dB CMRR:
 
Power over fiber is possible, but there is no such standard for ethernet.
And it's not feasible for power levels provided by PoE. Hard enough to power a GHz probe amplifier with a few mW transmitted through a fiber. Higher power is theoretically possible with thick fibres and e.g. used for medical instruments, but not really practicle for other purposes due to safety requirements.
 

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