D-Link DAP-1860 Guide D'installation Rapide page 6

When the Status LED turns solid green, this indicates that the DAP-1860 is
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securely connected to your wireless router or access point. You can now
unplug and move the DAP-1860 to a location between your wireless router
and the area that you need wireless coverage.
If the signal strength indicators are showing one single
amber bar or if the DAP-1860 is not connecting, move
the DAP-1860 to a wall outlet closer to your wireless
router or access point.
4 DAP-1860 Install Guide