Question: What is the specified test level for telecommunications ports directly connected to outdoor cables, according to the electromagnetic compatibility (EMC) standard for Multi-Standard Radio Base Stations?
Option 1: 500 V line to ground
Option 2: 750 V line to earth
Option 3: 2 kV line to ground
Option 4: 1 kV line to ground
Explanation: The correct answer, 1 kV line to ground, is specified for telecommunications ports intended to be directly connected to the telecommunications network via outdoor cables. This test level ensures equipment resilience against electrical surges through outdoor cable connections, in accordance with surge immunity standards.