Subelement C: Satellite Systems— Topic :
Question 27C2
Element 9 (GMDSS Maintainer)When is a PIN Unlock Key (PUK) used with an Inmarsat terminal?
Explanation
A PUK (PIN Unlock Key) is a security code specifically linked to a SIM (Subscriber Identity Module) card. Just like in cellular phones, SIM cards are used in Inmarsat FleetBroadband terminals to authenticate the user to the satellite network. If the SIM card's Personal Identification Number (PIN) is entered incorrectly multiple times, the SIM card will lock itself to prevent unauthorized use. The PUK is then required to unlock the SIM card and reset the PIN, restoring service.
Option A is incorrect because placing a credit card call is a billing method, unrelated to SIM card security. Option B is incorrect as the PUK is used to *unlock* a locked SIM card after too many incorrect PIN entries, not to input a PIN for an extension. Option C is incorrect; overriding a long-distance block is a network service or billing control function, not related to the SIM card's security features.
Related Questions
26C6 Which of the following is not a characteristic of an Inmarsat Fleet Broadband IP handset?27C1 What protocol can be used in connecting a PC to the LAN interface of an Inmarsat terminal?27C3 Which of the following is NOT a function of the LAN port on a Fleet Broadband terminal?27C4 What is the configuration for Thrane & Thrane F250 & F500 facsimile operation?27C5 What is the configuration Thrane & Thrane F500 for standard voice telephone operation?