ST0880WH EP10-series power12W Output voltage5V POE Power Transformer
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A conventional 100M PoE PD device does not need to support 802.3bt. 802.3bt is a four-pair high-power delivery standard, suited to ultra-high-power devices up to 90W (high-power APs, HD cameras, industrial terminals, etc.). The vast majority of 100M PoE devices on the market only need to be compatible with 802.3af (max 15.4W) and 802.3at (max 30W). Only when a 100M device's actual power consumption exceeds 30W and it requires four-pair combined power delivery to scale up power does it need to support 802.3bt.
Yes—PoE output always comes from the primary-side CT; on the secondary side, only 2 CTs are brought out for power delivery. This part's theoretical PoE power does not exceed 30W, so there is no design issue: pins 11/12 supply power and pin 9 connects to GND.
No. A 100M PoE transformer integrates only 2 pairs of differential windings, whereas gigabit Ethernet requires 4 pairs. In addition, the 100M transformer's bandwidth only supports 100Mbps and cannot meet the high-frequency signal transmission requirements of gigabit (1000Mbps).
They are not entirely the same; you must distinguish the roles of PSE (power sourcing equipment) and PD (powered device):
1. PSE side: The DC supply's positive terminal connects to the primary center tap (CT) of the Ethernet transformer, and the negative terminal connects to primary ground (or to ground via a bridge rectifier). Power is injected into the data pairs through the primary CT, achieving "phantom power."
2. PD side: DC power is extracted from the transformer's secondary center tap (CT)—the positive terminal is brought out from the CT, the negative terminal is grounded through a bridge rectifier, and power is then supplied to the load via a downstream regulator circuit.
