ZyXEL Communications FTU2000 User Manual page 6

3. Place the FSG2200HNU on top of the FTU2000, such that the nodule
of the FTU2000 goes into the hollow for the fiber port of the
FSG2200HNU, as shown below:
Slide the FSG2200HNU to your right so that the two devices are
connected and locked in snugly.
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