What bios feature shuts down the ethernet port when computer is shut down?

I'm trying to set up a wake on lan feature on my home pc (asrock z77 extreme 4 mobo) and wake it up from my android smart phone. So far the app works great, but after 10-20 minutes of the pc being in the powered off state, the ethernet port gets powered off which makes it impossible to wake it using wake on lan.

Anybody know how to solve this problem?
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More about bios feature shuts ethernet port computer shut
  1. WOL -- Wake On Lan >> Enable
  2. ERP/EUP will also shut down ports(USB power/network ect.) with the system off(standby).
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