Only digital and DOCSIS channels defined in the downstream (forward
path) channel plan are available for Constellation testing.
To configure Constellation testing:
- confirm that you are testing with the correct channel plan,
- confirm that you are testing the correct digital or DOCSIS channel in
that plan,
- select the number of samples processed (2000, 4000, 8000, 16,000, 32,000,
or 64,000), and
- select the zoom option to examine the constellation mode in more detail.
To configure your meter for Constellation testing:
1)Press the SETTINGS softkey, use the arrow keys to select Channel
Plans, and press ENTER.
2) On the SELECT A DOWNSTREAM PLAN screen, use the arrow keys to highlight
the correct plan for the network you are currently servicing.
NOTE: The name of the plan you have chosen will be displayed on the
right-hand side of the title bar at the top of all subsequent screens.
3) On the SELECT A DOWNSTREAM PLAN screen, press the PLAN softkey
and use the arrow keys to highlight EDIT, press ENTER.
4) On the SELECT A CHANNEL TO EDIT screen, use the arrow keys to highlight
the Channel you are currently servicing, press ENTER.
5) On the EDIT CHANNEL screen use the arrow keys to highlight TYPE,
press ENTER.
6) Change the type by using the arrow keys to select DOCSIS or DIG, select OK.
7) On the EDIT CHANNEL screen use the arrow keys to highlight Modulation,
press ENTER.
8) Change the type by using the arrow keys to select 256 QAM or
64 QAM, press OK.
9) On the EDIT CHANNEL screen, press OK.
10) On the SELECT A CHANNEL TO EDIT screen, press Done.
11) On the SELECT A DOWNSTREAM PLAN screen, press Done.
12) On the Constellation screen, select the number of samples processed
before a screen refresh. Press the SETTINGS softkey, use the arrow
keys to select Samples, and press ENTER.
13) Use the arrow keys to select the number of samples processed (2000,
4000, 8000, 16,000, 32,000, or 64,000).
14) On the Constellation screen, select the Zoom softkey to examine the
constellation mode in more detail.
15) On the Constellation screen, press the Zoom+
key to zoom in one level on the framed quadrant. NOTE:
The active quadrant of the constellation grid that will be zoomed into
is framed by a dark outline.
16) On the Constellation screen, use the arrow
keys to move this frame to the desired quadrant.
NOTE: In 64 QAM, three zoom levels are available for viewing - 8x8,
4x4, and 2x2. In 256 QAM, four zoom levels are available for viewing -
16x16, 8x8, 4x4, and 2x2.
NOTE: Within each zoom level you may navigate to the specific target
quadrant of interest to focus the next zoom operation. The zoom level
is represented in the lower right portion of the screen.
Example: In 64 QAM, a 4x4 grid will replace the original
8x8 grid, and a dark outline will frame four of the blocks. Press this
key again to see a 2x2 grid with only one block framed. This is the highest
level zoom in either modulation mode. The zoom level data might read Zoom: 3 indicating that two zoom operations
have been performed on the original full view Zoom:
1.
17) On the Constellation screen, press the Zoom- key to zoom out
one level from the current view.
18) On the Constellation screen, press the Zoom
1x key to view the full constellation grid (Zoom:
1).