1U KVM Console -- console-over-IP for up to 4 devices. Gives real terminal access to whatever's wired to it without needing a dedicated Terminal Server device racked as well.
Real terminal diagnostics (help/ip/devices/ping/who/netstat/logs/man and more) on anything wired to it -- the same command set a Terminal Server exposes, just reachable through this device's console ports instead.
5W typical draw, 50W max -- one of the cheapest devices in the roster to power, which matters little on its own but adds up when you're deciding what to rack in a tight, low-capacity satellite setup.
No need to own a dedicated Terminal Server just to get a shell on a device -- useful early game, or anywhere you want diagnostics without spending a rack slot and a PDU outlet on a Terminal Server that would otherwise sit idle.
Tip: the 4-device limit is per console, not per rack -- a rack with more than 4 devices you want shell access to still needs either a second KVM or an actual Terminal Server to cover the rest.
Takes the Redundant PSU upgrade ($1800, Inspector → Upgrades): it adds a second power input, PSU2. Wire PSU2 to a DIFFERENT PDU or UPS than PSU1 and this device keeps running when either one dies. Two feeds from the SAME PDU protects nothing -- the redundancy panel simulates that PDU failing and watches the device fail with it regardless of cable count. The spare idles at zero draw, so it costs nothing extra on the power bill. See Redundancy & Failover.