Question: In a Base Station (BS) with multiple enclosures, how must the Radio Digital Unit and the Radio Unit communicate during separate testing to mimic a single BS enclosure setup?
Option 1: Through a wired Ethernet connection only
Option 2: Over an interface enabling establishment of a communication link, as if in a single enclosure
Option 3: Via an external network, requiring additional routing configuration
Option 4: Directly through fiber optic cables, bypassing traditional interfaces
Explanation: This is correct because, according to the principles for testing BS with multiple enclosures, the communication between the Radio Digital Unit and the Radio Unit should be set up in a manner that replicates the conditions of a single enclosure. This ensures that the test accurately reflects the operational integrity of the BS when its components are housed together. The interface enabling establishment of a communication link is crucial for mimicking this integrated setup during separate testing of the units.