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 Channel 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.