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Happy Halloween 
Today, I would like to share with you an article about the overview of PoE. I will explain part by part.
PART-04: Troubleshooting (FAQ):
What type of network cable am I allowed to use?
The IEEE 802.3 working group has specified the rules for PoE switches and injectors. As a result, no additional wiring is necessary. However, keep in mind that Ultra-PoE connections necessitate 8-pin network wiring. Although almost all networking cabling is 8-pin, there is some low-cost wire that may only have 4-pins. They've become increasingly scarce as they can only be used for Fast-Ethernet connections.
What about power over Ethernet (PoE) and cable configurations?
Through an Ethernet wire, each PD has access to the network data. Prior to the introduction of PoE technology, each device required a separate power cord in addition to an Ethernet cable. Managing all of these cords became time-consuming and messy as the number of devices increased. Combining data and power supply over a single Cat5 Ethernet cable was the solution to the cable issue. Cat5 (almost obsolete), Cat5e, Cat6, Cat6a, Cat7, and Cat8 are the several types of Ethernet cables available today, each providing a higher level of noise and signal interference protection. However, the PSEs that support these PDs have not altered. They're either PoE injectors or PoE switches. The key to saving time and money is to know which one is appropriate for your implementation. And, if you learn the distinct characteristics of each, you will find that determining which is not difficult.
What is the maximum PoE distance?
Regardless of where the power is delivered, PoE can transfer 100 meters from the switch or hub to the Network interface controller (NIC). The limitation is not in terms of power; Ethernet cabling regulations limit total cable length to 100 meters, which is the maximum distance a PoE switch can transmit simple data over Ethernet. A PoE Ethernet extender, on the other hand, may expand the distance up to 4,000 feet. Extenders enable centralized control of networks spanning corporations, universities, and huge retail operations like shopping malls over a large area.
The connection distance can be increased by employing a PoE extender or PoE repeater, as the case may be. Between the PSE and the PD, a PoE extender is inserted. The connecting distance between the two sides can be up to 100 meters on each side (328 ft.). Some PoE extenders can be daisy-chained together to extend the total connection distance over 500 meters (1640 ft.).
Is it safe to use PoE technology? Is it possible that it will harm my equipment?
PoE technology that complies with IEEE 802.3af/at/bt is safe. Even if the equipment is not meant for PoE applications, PoE injectors and switches will not harm it. Before sending any power to a connected PD, the PSE performs a handshake operation to determine how much power is required by the attached device. This process uses minimal voltage and is completely safe for any connected device, whether PoE or not. If the handshake is successful, the PoE injector or switch sends power to the PD, causing it to turn on. The PSE never sends any electricity if that handshake is not completed for whatever reason. All IEEE 802.3af/at/bt-compliant devices have this built-in functionality, which makes PoE technology fundamentally safe.
You are welcome to like and leave feedback in the comment area.
Link:
PART 01:
PART 02:
PART 03:
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!
