In Ingress, when are links destroyed?

Question

At what level of resonator damage are existing links destroyed? I had heard that the portal must have more than two resonators remaining for any links to stay up, but I can't find any documentation of this.

Answer 1

I can bring you my experience on the field: the links on a portal are destroyed when there are two or less resonators remaining.

Sadly, the "official documentation" is more a collection of FAQs than an actual manual, so you'll have to rely on external resources or your direct experience to gather this kind of informations and become a better Agent.

Answer 2

After further testing, it appears that all links are dropped once there are only two resonators remaining. The energy left in the resonators does not seem to matter.

Answer 3

How far you can link form portal depends on the total energy of the portal.

From my observations, but no calculations:

The link goes down when the energy of the portal goes below energy needed to create that link.

When attacking a portal with multiple links they get destroyed consecutively, not all at once. This supports the above theory.

Answer 4

The link(s) are dropped once all resonators at the portal are at critical level.

manual source

Answer 5

As Kappei said, usually links go down, when portal has 2 or less resonators, but, I think thats is caused by the total of energy remaining in the portal. (i'm not really sure about it).

Just remember that, you CAN'T make a link from portal A to portal B if some one has less than 8 resonators, namely, the links are made between full portals

Answer 6

According to Google Ingress help:

Destroy an enemy controlled Link by attacking the Resonators that are deployed on the Portals that anchor the Link. For example, you can fire an XMP to damage a Resonator and reduce its XM health. When all eight resonators have their XM health reduced to the Critical level, then the Link will fail.

Link to text: https://support.google.com/ingress/answer/2808353?hl=en

Answer 7

I read somewhere, that links drop out, once all the resonators are below a critical energy level. This could be why some links appear to depend on the last 2 resonators?

As in, 6 resonators have faded/destroyed, but the remaining 2 have say 20%. Critical level is 10-15%, so the link stays. The logic that ALL 8 portals are below the critical level, will fail, as the two remaining are above. I may be wrong, but thats how I read it. Keeping two charged up, should therefore hold a link. Might even work with one? But not had time or patience to test this.