What does the PoE connection diagram look like?

Question

WiFi

Hello!
The task is this - you need to put a 4G modem on the roof. At the same time, the router that will distribute wifi is located 3 floors below (the first floor of the building). Active USB extension cables do not help, the computer simply does not see the modem.
I want to do this: we take a 4G modem e3372, a TP-Link TL-MR3020 router. We connect and leave on the roof. We plug a twisted pair cable into the LAN port and lead it down to the router, which will already distribute wifi.
BUT! There is nowhere to get 220v on the roof for the router to work.
Below - on the ground floor there are 220v outlets, on the top floor and on the roof - no. Therefore, I want to power the modem and router on the roof via PoE.
Tell me, please, did I understand correctly how I need to make a connection or not?

Answer 1

If the router does not support POE, then you need to embroider the twisted pair - green and orange pairs for the Internet, brown for + 9v, blue for - (gnd). If the router supports poe, then you need to buy any poe adapter.
There is another option: to assemble a usb twisted-pair extension cable. I have a webcam on 10m without additional. power at the end. The scheme is as follows:
•GND - two wires orange and orange-white;
• power +5V - two wires brown and brown-white;
•data "-" - on the green wire;
• data "+" - to green-white;
• braid - on two wires blue and blue-white.
Z.Y. In general, do I understand correctly that the goal is to ensure a good reception?
Then buy this antennadomantenn.ru/catalog/for_lte_mimo_2x2/antenna_4g_l... + cable assemblies to it and all this is connected to a modem that is plugged into the router and is warm. Neither modems nor routers are designed to work outside the home.

Answer 2

Well, in principle, everything is correct in your picture. The only question arises is that 5V should come to the router on the roof, what voltage does your POE adapter produce?
Well, tplink is probably not the best router, it may turn out that you have to pull this garland for power. I would look better in the direction of the same Mikrotik, there are pieces of iron that can eat through POE, and have a usb port, and if the usb modem freezes, it will be possible to make a script that will power it.

Answer 3

The whole point of PoE is high voltage (usually 48V) which is converted at the other end to the required 5V or 12V power supply via a "DC-DC step down" switching regulator. The standard implies power supply both on brown and blue pairs and on orange and green pairs (using the midpoints of the input transformer) to feed the supply voltage to the converter.
I propose as an alternative to apply 19V from a laptop adapter via a blue and brown pair - it will be quite enough at distances up to 30m. Do not start these pairs in the router, use DC-DC from the car USB charger.

Answer 4

So, but for such purposes it is much easier to throw the antenna on the 4th floor, connect it with coke to the modem installed in the router on the third.