What does the green led on the WAN port indicate?

Does it indicate that there is a PHYSICAL connection or there is activity? If you have a bad cable between the modem and the WAN, will the WAN led light up? If the modem isn't operating correctly, will the WAN led light up?
The reason I ask...I have two Airport Extremes. The green led on the WAN port started acting finicky on the first one (the internet is down whenever the WAN led isn't lit). I could jiggle the ethernet cable just right and it would come back on. I changed ethernet cables, no change. I decided the WAN port must have a bad connection internally, so I switched over to the second Extreme. Same problem. It is highly unlikely that two Extremes have the exact same problem. If I could figure out what that green led on the WAN port actually means, I could diagnose this a little better.
To make it worse, I have an ISP that loves to blame Apple for all their internet problems, so I need hard proof that something may be wrong with their modem.

Does it indicate that there is a PHYSICAL connection or there is activity?
Both. A solid green light indicates that there is a "live" connection on the other end of the cable. Network activity will be indicated by a flashing green light.
If you have a bad cable between the modem and the WAN, will the WAN led light up?
No.
If the modem isn't operating correctly, will the WAN led light up?
Possibly. A malfunctioning modem may still provide a solid connection and thus the light may still be lit, but no flashing to indicate that there is no activity on the connection.
I could jiggle the ethernet cable just right and it would come back on. I changed ethernet cables, no change. I decided the WAN port must have a bad connection internally, so I switched over to the second Extreme. Same problem. It is highly unlikely that two Extremes have the exact same problem.
Since you already tried multiple cables and multiple base stations, I would tend to believe the issue is with the ISP's modem.

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