Internet-based communications are not a new phenomenon. For many years, we have sent video, voice, and data across the public Internet to correspond with others free of charge or at a low cost.

The defining characteristics of LANs, in contrast to wide area networks (WANs), include their usually higher data-transfer rates, smaller geographic area, and lack of a need for leased telecommunication lines.

The defining characteristics of LANs, in contrast to wide area networks (WANs), include their usually higher data-transfer rates, smaller geographic area, and lack of a need for leased telecommunication lines.

The primary role of any UPS is to continue to supply electricity to the load for a certain period of time during a utility failure or when the line voltage varies outside the normal limits.

With the introduction of new Ethernet-enabled devices expanding geometrically, the need to power these devices from standard AC power outlets has become a limiting factor.