单对以太网技术（SPE, Single-Pair-Ethernet）描述了仅通过一对铜芯传输以太网，除了通过以太网传输数据外，还可以通过PoDL（数据线供电）同时为终端设备供电。
The MAXREFDES1273 is a Power-over-Ethernet (PoE) powered device (PD) and an active clamp forward DC-DC converter (ACFC) that delivers up to 850mA at 48V from 39V to 57V supply voltage
