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Passenger Internet Service Passenger internet service is the connectivity service that provides internet access to passengers aboard a moving vehicle or platform. It integrates onboard distribution, external transport, and service management into one… Service Model Path Congestion Path congestion is the state in which a network path experiences traffic demand that approaches or exceeds its effective capacity, resulting in degraded performance. It is a path-level performance condition. Concept/Framework Path Diversity Path diversity is the design condition in which a network has more than one independent path available between endpoints or service domains. It is used to improve resilience, traffic distribution,… Concept/Framework Path Loss Path loss is the reduction in received radio signal power that occurs because the signal must propagate through space and the surrounding environment. It is a fundamental factor in RF… Concept/Framework Phase Noise Phase noise is the undesirable short-term fluctuation of a signal’s phase around its nominal value. It appears as spectral spreading around a carrier and is a key metric of signal… Concept/Framework Phased Array Antenna Phased Array Antenna is an antenna system that steers its beam electronically by controlling the phase of multiple radiating elements, enabling directional beam movement without mechanical structure rotation. Hardware Physical Isolation Physical isolation is the architectural practice of separating systems or zones so that communication or access requires crossing a deliberate physical boundary. It is used to contain risk, protect critical… Concept/Framework Radar Radar is a radio sensing system that transmits electromagnetic energy, receives reflections, and processes them to infer the presence, distance, velocity, or other properties of objects. It is used for… Hardware Radiator Panel Radiator Panel is a thermal control surface that rejects heat from a system by radiating thermal energy to the environment, removing excess onboard heat through passive radiation. Hardware Recovery Time Recovery time is the duration between a disruptive event and the point at which a system, service, or function has been restored to a usable state. It is used to… Concept/Framework