It looks like you were watching a TV channel on one STB connected via coax, and another TV connected via Ethernet port 3. Is this correct?
If so, were you watching the same channel on both TVs? If so, that is the result of multicast. A single (standard definition) stream is coming in via VDSL, and two duplicates of the stream are being sent to two STBs.
Okay sorry, port 3 is my basement TV. I didn't realize the STB was on. And I was counting the wrong way, top down. Which is why I thought 3 was my PS3.
So yeah.. Port 4 = PC Port 3 = PC Port 2 = PS3 Port 1 = PC
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