Chapter 16 567
W-CDMA Uplink Digital Modulation for Receiver Test
W-CDMA Uplink Concepts
Figure 16-84 PRACH Synchronization - Frame Number Alignment
Frame Sync Trigger Status Indicator
The signal generator uses a synchronization annunciator to indicate the state of the signal generator’s frame
synchronization and whether or not a synchronization trigger was received. Figure 16-85 shows the uplink
user interface (UI) and the synchronization annunciator. When Sync Trg replaces Out Sync as the current
annunciator, the frame sync trigger has either been received (dark text) or has not been received (gray text).
The conditions are described as follows:
Sync Trg (grayed out):
The frame sync trigger was not received after a trigger status reset.
Sync Trg (active):
The frame sync trigger was received after the trigger status is reset.
Out Sync: When the synchronization annunciator indicates Out Sync, the signal generator is not
synchronizing with the external frame sync trigger. It is only displayed when an
out-of-sync condition occurs. This indicator remains active until the next frame sync
trigger is received.
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