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https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/723192/faq-what-is-the-use-of-t2p-in-poe-applications
T2P 在 PoE 应用中的用途是什么？
硬件分级允许 PSE 在供电之前确定 PD 的电源要求，并在通电后帮助进行电源管理。 2类硬件分级允许高功率 PSE 和 PD 确定所连接的器件是否支持高功率运行。 TI 的 PoE PD 器件可以处理硬分级并输出 T2P 低电平。
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