🔍 Key Concepts
• INMARSAT-M is an older maritime satellite service designed mainly for small ship earth stations
• Compare typical bit rates and services of early INMARSAT systems (A, B, C, M) – especially which ones carried voice, fax, data, and e-mail
• Think about realistic combinations of services at the relatively low bit rates used by INMARSAT‑M
💭 Think About
• Which answer choice looks like a balanced, practical service package for small-ship satellite terminals of that era (not too high bit rates, but still useful)?
• Which options include voice plus at least one form of data/fax, and which seem more like pure data services?
• Do any options list speeds that seem unusually high for earlier narrowband maritime satellite systems?
✅ Before You Answer
• Identify which choices include voice capability (a key feature of INMARSAT‑M)
• Compare the stated bit rates with what you know about older narrowband satellite links – rule out speeds that seem unrealistic for that generation
• Check whether the combination of services (voice, fax, data, e‑mail) makes sense for a compact shipboard terminal rather than a large shore station