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UTM A consolidated security appliance combining multiple protective functions — firewall, intrusion detection and prevention, antivirus, content filtering — into a single managed platform, typically deployed as on-premises hardware at a… Hardware VDES An IALA/ITU-standardized maritime digital communication system that adds dedicated data-exchange channels to the VHF maritime mobile band, supporting higher-throughput ship-to-ship, ship-to-shore, and satellite-extended data services beyond what AIS's messaging channels… Protocol Vehicle-to-Everything The umbrella category of communication applications enabling a vehicle to exchange information with other vehicles, roadside infrastructure, pedestrians, and the cellular network, most commonly implemented as cellular V2X using 3GPP… Concept/Framework Vehicular Terminal Vehicular Terminal is a communications terminal mounted on or used within a vehicle to provide in-motion connectivity, enabling network access during movement or operation away from fixed infrastructure. Hardware Vessel Network Segmentation Vessel Network Segmentation is the separation of onboard network traffic into distinct zones or segments for security, reliability, or policy control. Operations Vessel Tracking The umbrella practice of monitoring a vessel's position and movement over time using some combination of AIS broadcast, satellite-based reporting, and other position sources, supporting safety, commercial fleet management, and… Concept/Framework VHF Data Link A VHF radio technology providing the physical and link-layer transport for digital datalink communications between aircraft and ground stations, using dedicated data channels within the VHF aeronautical band separate from… Protocol Virtual Private Network A virtual private network is a logical network connection that uses encryption and authenticated tunneling to carry traffic over another network. Concept/Framework VoLTE A protocol delivering voice calls as packet-switched IP data over the same 4G LTE packet network that carries data traffic, depending on the Evolved Packet Core's all-IP architecture rather than… Protocol VSAT VSAT is a very small aperture terminal used to communicate with satellites through a relatively small ground antenna. It is commonly used for remote connectivity. Hardware