What is the meaning of the "ACB" Inmarsat-C...

What is the meaning of the "ACB" Inmarsat-C...

Question 1 of 27070EGPjXdnFu2f6VMW1vBsj

What is the meaning of the "ACB" Inmarsat-C Non-Delivery Notification (NDN) failure code?

Question 1 of 27070

Q

What is the meaning of the "ACB" Inmarsat-C Non-Delivery Notification (NDN) failure code?

🔍 Key Concepts

• Inmarsat-C NDN (Non-Delivery Notification) and what each failure code generally indicates • Difference between barring/access problems vs. technical transmission errors (bit error rate, channel failure, invalid answer-back) • How Inmarsat deals with a terminal that has been restricted or blocked from using the network

💭 Think About

• Look at which option describes a user authorization / access problem instead of a technical signal or channel quality problem. • Ask yourself: if a terminal has been deliberately blocked by the system operator, which phrase in the answers best matches that condition? • Compare the words "bit error", "channel failure", "invalid answer-back" and "barred" – which one clearly points to a permission/authorization status rather than a physical or signal fault?

✅ Before You Answer

• Identify which choice describes a network access / authorization restriction rather than a technical malfunction. • Confirm that NDN codes often distinguish between system barring and signal quality or equipment faults. • Before choosing, re-read each option and mark which are clearly technical errors versus administrative/access issues.