Chapter 10 Measure Mode – Spectrum Tab
Upstream Spectrum
250 DSAM Help User Guide Rev. 001
5 Press the Limits softkey.
6 Using the arrow keys, select Off or a limit set (Tap, Ground
Block, TV, Cable Modem, Proof, or custom limits 1-3).
7 Press ENTER.
8 To edit the limit value, press the Limits softkey.
9 Using the arrow keys, select the Edit option.
10 Press ENTER.
Understanding
Upstream
Spectrum Results
The graph continuously updates as each frequency is measured. This
forms a graph across the entire frequency range. When excessive
ingress noise occurs at a specific frequency, the measurement line
develops a peak on the graph.
NOTE
When you select Edit, the limit-set parameters you define remain
constant for all channel plans and measurement modes.
Figure 227 Configure – Select a Limit Set to Edit
NOTE
See “Limit Sets” on page 58 for instructions on editing limit sets.
If you chose the wrong limit set before conducting the test, press
the Limits softkey and select a different limit set to view your test
results in relation to a different limit set without rerunning the test.
21128026 R001 DSAM Help User Guide.book Page 250 Thursday, February 5, 2009 2:02 PM
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