Table of Contents
Advertisement
21128026 R001 DSAM Help User Guide.book Page 187 Thursday, February 5, 2009 2:02 PM
Graph
Symbol Rate
Transmit Status
View Menu
QAM Ingress
DSAM Help User Guide
Displays signal level on the Y-axis. A vertical bar is displayed and the
height of the bar represents the signal level.
The number of symbol changes (signaling events) made to the
transmission medium per second using a digitally modulated signal or a
line code. The Symbol Rate is measured in baud (Bd) or
symbols/second. The default value is 1.28.
Indicates whether Tx is enabled or disabled.
NOTE
For information about how to read the graph, see
surement Graphs" on page
To access different functions and shortcuts to other tests
1 Press the View softkey.
2 Using the arrow keys, select one of the following options:
– Single Channel – Displays measurements one channel at a
time. First, use the numeric keypad to enter the channel
number then highlight this option from the View menu.
– Constellation – Displays the Constellation screen.
– Upstream Spectrum – Displays the Upstream Spectrum
measurement mode.
– Downstream Spectrum – Displays the Downstream Spectrum
measurement mode.
3 Press ENTER.
The QAM Ingress mode is a line plot which graphs signal error versus
frequency of QAM signals. This mode supports Ingress Under Carrier
for 64 QAM and 256 QAM signals. (Additional purchase required.)
The QAM Ingress mode enables you to:
– View a graphic depiction of the signal
– View the QAM type (64 or 256)
– View the channel number
Rev. 001
Chapter 8 Measure Mode – Basic Tab
"Reading Mea-
196.
QAM Ingress
187
Advertisement
Table of Contents
