A network management system determines whether end-to-end network paths are working, using network probes. A sensor is configured to receive the light focused by the first deformable lens. The primary circuit is electrically coupled to a source of AC power and to the output terminals for selectively providing power at a low voltage at the output terminals or electronically coupling the source of AC power directly to the output terminals. The bus bridge includes a first portion having a first bridge memory, a second portion having a second bridge memory, and a latency inducing serial bus interconnecting the first portion and the second portion.