A test set equipped with cdma2000, 1xEV-DO or W-CDMA lab applications can perform mobile station tests that require faded signals. The test set must be equipped with a rear panel that includes a connector labeled Digital Bus.
When a faded signal from the test set is needed, the forward baseband signal path from the Test Set is diverted to a PC running Baseband Studio software. This software is capable of digitally adding fading patterns requested by the user.
Baseband Studio software also controls the test set's call parameters and digital bus signal path switching modes. The status of the various digital bus parameters and the controls themselves are made available by selecting
Digital Bus Info
from the Call Control screen.
Digital Bus Path - Must be Internal for non-faded signal operation.
ALC Mode - Must be Closed Loop for non-faded signal operation.
Calibrate Open Loop ALC - Used to generate calibration tables that are needed when ALC Mode is Open Loop.