Examples for prepared IP-Link connectors

Right:

A correct IP-Link connector should look like this:

The fiber is stays slightly above the connector tip and is almost rectangular. No damage of the fiber is visible.

Wrong:

This fiber was cut to short before the connector, it split into the connector and cannot be sanded correctly (dark part is visible).
This connector has be done over.

Wrong:

Here, the fiber was cut to short in the preassemble phase. the fiber does not even reach the connector tip.
This whole connector has to be done over.

Wrong:

The fiber was sanded correctly. It has a clean, undisturbed light emission.

But the fiber is to long. This way it could damage  the optical elements of the modules.
It can very simply be corrected by sanding down the fiber carefully to the correct measurement.