Phase Phase is used to describe the two main types of alternating current (AC) electric power produced by a utility, generator or UPS system. Single-phase power includes a single AC waveform, making single-phase equipment ideal for lower power density applications with per-rack power consumption levels up to approximately 2.8kVA (120V), 5kVA (208V) or 7.4kVA (230V).

Three-phase power includes 3 AC waveforms, making 3-phase equipment better suited for intermediate and high-capacity applications with per-rack power consumption levels that surpass the practical energy limits of single-phase equipment. PDU Type Basic PDUs All PDUs including Basic PDUs provide reliable rack-mount power distribution for data centers, server rooms, and network wiring closets. Metered PDUs Metered PDUs monitor load levels to avoid potential overloads via a LCD display. Monitored PDUs Monitored PDUs remotely monitor voltage, frequency, and load levels via a built-in network connection.

Provides 4 external USB 2.0 ports in a compact and portable form factor. Item worked perfectly with my Windows 7 laptop. Mini 4 Port USB 2.0 Hub. Peek.dll Peek5.sys.