D-Link DCS-7517 Guide D'installation page 7

Connecting the Optional Cable Harness
Remove the back camera cover by turning it
counter-clockwise.
Remove the back waterproofing plug from the
camera.
Push the camera connector and cable through the
hole, and insert the cable's waterproofing plug.
Make sure the plug is inserted properly to ensure a
good seal.
Connect the camera connector to the camera.
Reattach the back camera cover by turning it
clockwise.
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D-Link DCS-7517 Quick Installation Guide