HIKVISION 21 Series Quick Start Manual page 21

Figure 8, Drill Template
NOTES:
If you choose to route cable through the ceiling, cut a cable
hole according to Hole A on drill template.
You can also route cable from the side outlet.
If you install the camera outdoors, install the waterproof
jacket to the network cable. See Section 2.4.
QSG Network Dome Camera 2