Quite glad I got the Java bit running. I'd not have spotted it via the lights on the switch as they face the back of my desk and I missed it in the text but the simple graphic display of its ports (which is all it gives) did show me that the Netgear switch was supplying a Cisco switch with power (that one can be powered by mains or poe on port 1) which wasn't what I wanted.

Oh well, Firefox 48.2 and Java 8 (Opensuse Leap 15 comes with IcedTea 10 & 11 rather than an Oracle Java and I don't see a plugin to install there) will do me for both types of switch unless I learn something better.