5-Port PoE Powered Managed Gigabit Switch - RTL8367N

Background:
When upgrading my smart home system, I discovered that the only pre-installed network cable on the ceiling was insufficient.
I have surveillance cameras and a smart home gateway,
so I needed to split one network port into multiple PoE power supply ports.
Therefore, I built a PoE power receiving and supply integrated (cascaded) gigabit switch.
Considering that my surveillance cameras and smart home devices are on different VLANs, this design supports VLAN management. I
designed a casing on the LCSC EDA, but unfortunately, I'm not good at structural design, so it's just a makeshift solution. Please don't criticize me, structural experts.
I have to complain about the LCSC EDA here: firstly, some packages have problems, so you must check them carefully during the design process; secondly, it's very laggy. It doesn't have the smooth feel of Alibaba's EDA.
Error correction: Do not use the part number shown in the schematic for the varistor RV1. You need to choose one with a higher operating voltage. I actually used TVM5B820K601RY, and you can choose a similar model from the LCSC online store. If it's for home use, you can omit the varistor and TVS.
The design scheme
uses the commonly used RTL8367N switching chip, which is very inexpensive on Taobao. Any
Flash chip with 16Mb or higher can be used.
The PD chip is the XS2100S, supporting 30W at standard power supply. (SD4923, TPS2378, etc. are also options.)
The PSE chip is the MAX5980GT, supporting 4-channel at standard power supply; the main peripherals are simple and can be hardware controlled. (Very inexpensive on Taobao.) For
the switch section's power supply, the 48V to 5V buck converter uses the TD1466, and the two power supplies for the RTL both use the SY8088.
The entire board's PoE power supply section uses the 30W at standard, with all four power ports providing at standard output support (of course, the total power cannot exceed this). I connected three IPC cameras and a Xiaomi central gateway downstream, and the power supply was sufficient (less than 10 watts).
20240402: Added version V1.10, which adds a maximum power alarm; when the output reaches the maximum power under the at standard power supply, the indicator light will illuminate.
20240422: Added version V1.20. This version modifies version V1.00 to use BT standard class 8 power supply, i.e., BT 90W power supply.
Debugging and testing:
1. The MAC address and serial number need to be modified manually. The default MAC address and serial number are: CC:CC:CC:CC:CC:CC and 3MX8888888D8. Modify the address to 0x001FC000.
2. The RTL chip gets extremely hot after enabling the MCU. Pay attention to heat dissipation.
3. There are several heat sources on the board that need attention: RTL chip, rectifier bridge, PD chip, and high-voltage buck.
4. This design does not use a PoE dedicated network transformer; I used a regular one. If you need to replace it, you can choose one with the same package.
5. The network cable is strictly differential and not designed for equal length and impedance. If needed, calculate the impedance and fine-tune it yourself.
6. One lit network port indicator light indicates 10M/100M, two lit lights indicate 1000M.
7. Default login address: 192.168.0.239
8. Long press the button to initialize.