Is a network security device, either hardware- or software-based, that monitors and controls incoming and outgoing network traffic based on a set of security rules in order to protect internal private networks from unauthorized access, malicious attacks, or intrusions.

Is a facilty for measure & control, including the main plant computerized operational system, where all process, utility and off site activities are monitored. The system may be located in the main control room. (e.g. PLC Programmable logic controller, DCS distributed control system, ENMC Electrical Network Monitoring and Control system).

A transceiver which has the methods of signalling through space, without connecting wires.

A router is a computer networking device that forwards data packets toward their destinations through a process known as routing. Routing occurs at layer 3 (Network layer) of the OSI seven-layer model.

A system that provides voice and telefax communication via satellites.

A physical object that converts sound signals into corresponding variations of electric current (or potential), which is transmitted by wire or radio to a distant point where it is reconverted into sound.

A wireless access point (WAP) is a device that allows wired communication devices to connect to a wireless network using Wi-Fi, Bluetooth or related standards. The WAP usually connects to a router, and can relay data between the wireless devices (such as computers or printers) and wired devices on the network.