The DQI measurement uses error magnitude information from the output of the QAM demodulator within DSAM, including error magnitudes that do not result in either pre or post BER errors. Measurement response is considerably faster and more sensitive to transient and intermittent issues than the MER measurement.

Softkeys

Three softkeys on the DQI screen provide the following options:

FILE

Save a measurement or open an existing DQI measurement file to compare previously collected data. Use the arrow keys to choose the menu item you prefer and press ENTER to make your selection.

VIEW

Select Single ChanneI to view a Single Channel measurement screen.

Select MiniScan to view the MiniScan measurement screen.

Select Tilt to view the Tilt measurement screen.

Select Full Scan to view the Full Scan measurement screen.

Select Constellation to view the Constellation measurement screen.

Select Qam Ingress to view the Qam Ingress measurement screen.

Select Pause to suspend measurement updates (Keystroke shortcut: SHIFT 8). Use the arrow keys to choose the menu item you prefer and press ENTER to make your selection.

SETTINGS
Select Channel Plans to choose an alternate channel plan or to edit the configuration of the existing plan. Press ENTER.