I'm new to networking and PoE but am trying to understand it enough to explain myself. I recently spoke to a Genisys lighting rep who told me their systems couldn't be on the same network as an IP camera system, or at least that is what I understood. I realize now there are managed and unmanaged switches, with hardware-based networks and logic-based networks. If I have a managed switch with IP cameras, could I add (generic) PoE lighting on the same network or would I need to create a logical network to keep the two systems from seeing one another? What if I got an unmanaged switch? Could I do this with one switch or would it take more?
If I have a managed switch with IP cameras, could I add (generic) PoE lighting on the same network or would I need to create a logical network to keep the two systems from seeing one another?
While there isn't any likely technical reason to seperate lighting systems from your data network, you should do so because of security considerations. IoT devices are often supported poorly, updated seldomly and they can pose a significant threat to your better kept devices.
Normally, traffic is separated using VLANs and firewall rules to permit/forbid specific traffic.
What if I got an unmanaged switch?
You can't separate traffic on a single unmanaged switch, so you'd require multiple ones.
PoE switches are often responsible for powering telephones which are expected to work in the event of a power outage. This is achieved by backup power for the centralized switch farm(s). Typically battery backup is used here.
If a lighting rep is proposing Ethernet infrastructure to power the lights, I would want to know if there is a premium to pay and if so, what am I gaining by spending that extra money. People expect the lights to go out when the power goes out, but not the telephones.
Technically speaking it can all run on the same Ethernet switching infrastructure but as an engineer I would wonder why am I adding the lighting system on to my Ethernet switching infrastructure as WiFi is sufficient to communicate with IoT endpoints.