X40J circuit is which type?

• A. Casualty Command Circuit
• B. Casualty Assistance Circuit
• C. Casualty Communication Circuit
• D. Casualty Routing Circuit

Answer: (C)

X40J is a casualty communication circuit. Its purpose is to carry casualty-related messages and coordinate damage-control actions across stations, even if power is out or normal systems are down. In a sound-powered telephone setup on a ship, this type of circuit is dedicated to exchanging information about injuries, damage, and needed assistance, keeping the flow of communication focused on casualty management. This differentiates it from a casualty command circuit (used for high-level directing of actions), a casualty routing circuit (directs messages to the correct stations), or a casualty assistance circuit (supports medical or welfare tasks). The key idea is that the casualty communication circuit is specifically for relaying casualty information and coordinating response.