In case, the above conditions do not apply, surveillance systems with IP technology or standard coaxial cables are usually the better choice, for the following reasons:
1. Multiple walls and few WLAN sources together result in a problem
Walls attenuate the signal particularly well due to the high frequency of WLAN. If other factors such as tiles on the walls are added, it becomes more and more difficult. Tiles are varnished which contains metal salts, often titanium dioxide. This is a similar strong shielding as aluminium foil. Therefore, it requires a very comprehensive coverage with WLAN. This is quite expensive because you have to use several repeaters which in turn need power and a strong signal. Various paints and wall coatings also shield very well.
2. If you are using multiple cameras, you must apply a state-of-the-art WLAN infrastructure
The number of registered cameras in the WLAN network is almost unlimited. However, the images from video surveillance cameras are quite large nowadays and thus cause a large amount of data. Therefore, it requires a certain bandwidth in order to transmit these images at an acceptable speed. Assuming that we are applying 3, 4 or even more cameras, we require a wide bandwidth and repeaters due to the walls. All in all, the effort clearly exceeds the more cost-effective wired solution.
We must never forget that video surveillance is not the only element in the WLAN network. Streaming and other end devices all use up bandwidth.
3. Video surveillance cameras require cables, even if they are operated via WLAN
At first glance, this might, of course, be an obvious statement. However, I have often encountered this mistake in day-to-day work. Even though video surveillance via WLAN is wireless, this only applies to the data. If I want to have video surveillance in my garden, I still need electricity. This means that I still have to lay cables and install sockets, which is a great effort, especially for outdoor installations. Therefore, it may not be as appropriate to use WLAN cameras.