Shown on the left is a typical solution of the hot aisle (back of the cabinet) where the two PDUs reside. Attached to these PDUs are the access hub and electronic Swinghandles, enabling electronic rack access, an automatic rack light and environmental sensors (T in the rear and 3T+H in the front). Optional equipment is also shown using the sensor hub and accessories; such as water rope leak detection and a dry contact micro-switch.