ethernet cable blinking green

i wanted to know exactly why my lan cable is blinking green on my modem. its for my playstation and i used to get my ping from 0 to 20 and it was perfect but now its staying at 40 and we pay for the same fast internet. I look it up and it says it means it’s transferring data when it blinks green but idk i just remember it used to blink orange when i used to have it plugged in and my ping was better so im confused.