Given the following -
Rule #1 - Cameras multiply like rabbits.
Rule #2 - Cameras are more addictive than drugs.
Rule #3 - You never have enough cameras.
I'd say a 16 port is the base starting level.
I have to agree with all three rules stated up above. I have a small system in place but live by the credo.
Better to have and not need. Than to need and not have!
This is a really old photo of one of four 42U server racks and the wiring was being tested and cut to length.
There are four isolated networks that run on 10 / 40 GB fibre. Multiple redundant 48 port switches, 48 port POE switches, aggregate switches, 10 GB Firewall, and four levels of independent power systems.
Once the renovation are completed there will be almost 9 miles of wiring or 50K feet of power, Ethernet cable, and optical fibre.