Question: In a GSM Public Land Mobile Network (PLMN), where does the Radio Interface Connection Element terminate, according to 3GPP specifications?
Option 1: At the Mobile Switching Center (MSC)
Option 2: Within the Base Station System (BSS) at an internal reference point
Option 3: Directly at the User Equipment (UE: Mobile Termination)
Option 4: At the Interworking Function (IWF) of the MSC
Explanation: According to the specifications, the Radio Interface Connection Element spans from the Mobile Termination (User Equipment side) to an appropriate internal reference point within the Base Station System. This indicates that while it originates at the UE (Mobile Termination), its termination point for the purpose of this connection element is indeed within the BSS, making Option 2 the correct answer. This highlights the layered structure of connections in telecom networks, emphasizing how different segments of a connection can be defined for operational and analytical purposes.