For a perimeter system, the calculation is simple: six cameras spread along the fence, six cables running all the way back to the central unit, six runs of 80-120 meters each. That's hundreds of meters of cable, hours of installation time, and, at the end of some of them, the issue of distance. The same fence can be covered with a single backbone cable up to a central pole and an outdoor switch that powers the surrounding cameras with twenty-meter runs.
Why it's worth it
The savings are not so much on the cable, which is cheap: it's on installation, conduits, and time. One backbone instead of six means a smaller pipe, a single trench, and fewer wall penetrations. And if you add a camera in that area in the future, you don't have to run back to the central unit: you just plug it into a free port on the switch that's already there.
There is also a less obvious advantage: with short runs, the PoE signal remains strong. The voltage drop over twenty meters is negligible, and that motorized camera that was acting up at the 90-meter limit will simply work perfectly at twenty meters.
What it needs to have
First and foremost, the ingress protection rating. An IP65 device can withstand driving rain and dust: it’s the minimum for outdoor use. If you are installing it in an area exposed to the sea—and in Sicily, salt air travels far—consider an additional enclosure anyway, because the problem isn't the water, it's the corrosion of the connectors.
Then there's the PoE budget and the power distribution across ports. Most common outdoor devices offer between 60 and 120 W total. Check for dedicated high-power ports: on 120 W models, it's common to find six standard ports up to 30 W and two Hi-PoE ports up to 60 W, designed specifically for motorized cameras or radio bridges.
Third, how the switch itself is powered. Some require 230 V at the pole, which means you need a power line up there. Others accept PoE input: you power them from the same backbone that carries the data, and no mains power reaches the pole. The second solution is cleaner and safer, but watch the math: the power entering through the backbone must be enough for the switch and everything connected to it.
Fourth, protections. An outdoor device is prone to lightning surges on the lines. Look for surge protection on the ports and, if the system is exposed, add surge arresters to the backbone.
The watchdog, the feature that saves your outings
Many surveillance switches—even outdoor ones—have automatic device monitoring: if a camera stops responding to a ping, the port is power-cycled, effectively rebooting the camera automatically. Nine times out of ten, a camera freeze is resolved this way, and with a watchdog, it's fixed at 3 AM without anyone having to climb a ladder. On an eight-meter pole, this is the feature that pays for the price difference all on its own.
Where to put it
On the central pole of the camera cluster, at a working height if possible, with the cable gland facing downward and a drip loop on the cables: water should always have a lower point to travel to before reaching the connector. If you mount it high up, use a bracket that allows you to detach it, because sooner or later, you'll need to go back up there.
In our catalog, you will find unmanaged switches and managed ones, including weatherproof outdoor versions with Hi-PoE, plus network accessories for enclosures and protection. Send us your perimeter diagram and we'll tell you where it's best to place the active pole: info@elettricity.com, 351 969 5157.