🔍 Key Concepts

• Inmarsat-C capabilities compared to other Inmarsat systems (like Inmarsat-A or -B) • Difference between data/telex-style messaging and real-time voice communication • How Inmarsat-C messages can be converted or forwarded as telex, fax, or email/x.400 on shore

💭 Think About

• Think about what type of communications Inmarsat-C was primarily designed for: is it real-time voice or store-and-forward data messaging? • Which of the listed services require a continuous, real-time connection, and which can be sent as text or data packets? • Consider which services can be handled by a coast earth station converting text into another format for final delivery ashore.

✅ Before You Answer

• Identify whether Inmarsat-C terminals have voice channels or are strictly data/telex-based • Confirm that telex-style text can be routed to different shore-side networks (fax, x.400, etc.) • Ask: which option absolutely requires a real-time audio path from ship to shore, instead of just text/data?