HI Hi, Greetings! 
Happy Halloween 
Today, I would like to share with you an article about the overview of PoE. I will explain part by part.
PART-03: How PoE works?
It works in a straightforward way. PoE sends power over these pairs to PoE-enabled devices through an Ethernet cable that meets CATx requirements. Two twisted pairs are used for data transmission in the first PoE standards, while the remaining two pairs are used for power transmission. Power and data are transmitted over all four twisted pairs under the new PoE standards.
The power and data transfers do not conflict with one other when the same pairings are used for both power and data. Because data and electricity travel at different extremes of the frequency spectrum, this is the case. Data transmissions can have frequencies ranging from 10 million to 100 million Hz, while electricity has a low frequency of 60 Hz or fewer.
The table below shows the relationship between power availability and the number of PoE extenders used.
| Number of extenders | Distance | Maximum power available from PSE (input) | Maximum power for PD (output) |
| 1 | 200 m | 25 W | 20 W |
| 2 | 300 m | 20 W | 15 W |
| 3 | 400 m | 15 W | 10 W |
| 4 | 500 m | 10 W | 5 W |
Ethernet cables are typically designed with extra data-carrying capacity in mind. The exception is Gigabit cable, which uses all four pairs of wires to provide larger, quicker data carrying capability.
Benefits of PoE:
Cost-effectiveness:
PoE eliminates the need to hire experienced electricians.
Easy installation:
To use PoE, all you have to do is connect networking cabling to the appropriate equipment.
Flexibility:
Network administrators can place powered devices almost anywhere they like. For outdoor applications, shielded cabling might be employed. For industrial environments, industrial-grade powered devices can be employed.
Safety:
PoE operates at such a low voltage, it poses few electrical concerns.
Reliability:
PoE is compliant with IEEE's stringent 802.3 standards.
Scalability:
Adding more equipment to a network is a breeze with PoE.
Limitations of PoE:
Simple PoE has a range of only 100 meters.
Devices that aren't compliant necessitate the purchase of additional hardware.
Power budgets may be limited to levels that can be achieved with legacy equipment.
You are welcome to like and leave feedback in the comment area.
Link:
PART 01:
PART 02:
PART 04:
Source:
https://www.black-box.de/en-de/page/23894/Resources/Technical-Resources/Black-Box-Explains/lan/PoE-in-Networking
https://support.biamp.com/General/Networking/Power_over_Ethernet_(PoE)
M M Zaheer Hussain
Stay Safe!
