Question: What is a prerequisite for an overall connection type to be classified as 'Unrestricted Digital' in a GSM Public Land Mobile Network (PLMN)?
Option 1: All connection elements must contain speech processing functions.
Option 2: No connection element may contain speech processing functions or echo suppression functions.
Option 3: At least one connection element must have Multiple satellite hops capability.
Option 4: Discontinuous Transmission must be enabled across all connection elements.
Explanation: For a connection to be considered 'Unrestricted Digital', it cannot have any limitations imposed by speech processing or echo suppression, which are tailored for speech transmission. Thus, the absence of these functions in all connection elements is crucial. This ensures the connection can handle unrestricted digital information without any speech-oriented processing alterations.