The recommended PCB layout for the RTL8201L is to use a 4-layer PCB with a solid ground plane on the bottom layer, and to keep the analog and digital signal traces separate to minimize noise and interference.
To optimize the RTL8201L's power consumption, use the lowest possible clock frequency, disable unnecessary peripherals, and use the power-down mode when not transmitting or receiving data.
The maximum cable length supported by the RTL8201L is 100 meters, but this can be extended up to 200 meters using repeaters or switches.
To troubleshoot issues with the RTL8201L, use a logic analyzer or oscilloscope to monitor the signal lines, check the power supply voltage and current, and verify the PCB layout and component placement.
The RTL8201L is designed to work with Realtek's RTL8305S PHY chip, but it may be possible to use it with other PHY chips that are compatible with the IEEE 802.3u standard, although this may require additional design and testing.