Unmanaged data switches for camera LANs where power comes from a separate source or from a PoE unit upstream. 4 to 24 ports, 100M or gigabit, desktop and 1U chassis, so a small cabinet can be built without paying for features the site never uses.
One port per camera, one for the NVR and one for the uplink to the office. Leave at least two spare ports for a second NVR, a service laptop or a camera added later; running a switch at 100% occupancy is the most common reason a site has to be rebuilt after one upgrade.
Where the run to the office exceeds 100 m, take a model with an SFP slot and use fibre. Depth matters as well: a 1U chassis needs a rack, while the desktop units fit a wall box in small shops and apartments.
Typical choices: RS1008K for eight-camera cabinets, RS1005KL where a compact chassis is enough.