Cables, Cables, and more cables.

The devices from top to bottom are: a 16-port 100mbit switch, a 48-port 100mbit switch, and a thermometer costing a mere 800 EUR.

Don't care about the blinkenlights --- all these units are monitored and managed via the network. Usually, nobody is working in Alcatraz. Remember my office? Of course I cannot see that LCD from here. But nevertheless I can check that it has currently 20 and 24 degrees Celsius, measred in two different spots.