Planet POE-150, User Manual

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2. Can device only work at 100Mbps when it is connected to
Gigabit Ethernet device?
Answer:
POE-150/150S will use 4-wire for data transmission (pair 1,
2, pair 3, 6) and 4-wire for power supply (pair 4, 5, pair 7,
8), thus Gigabit Ethernet device connect to POE-150/150S
will not send data over the power wire and the transmit
speed shall change to 100Mbps.