Performing Docsis Measurements - JDS Uniphase Wavetek DSAM Series Quick Start Manual

Chapter 2 DSAM Operation
Using Measure Mode
Performing
DOCSIS
measurements
34
Use the up and down arrow keys to adjust the reference
setting of the graph by one (1) dB per key press. Use the
right and left arrow keys to move the vertical marker to the
next or previous measurement data point.
The Help system offers additional instruction about these
tasks.
Prior to an installation, use upstream spectrum measure-
ments to verify that the system does not exceed the
maximum acceptable level for ingress. After an installa-
tion, check the level again to compare the previous
reading and confirm that install procedures or components
did not create new sources of ingress.
DOCSIS Mode analyzes the digital performance of user-
selected DOCSIS channels to verify downstream/
upstream connectivity. Only DOCSIS channels defined in
the downstream (forward path) channel plan are available
for DOCSIS measurement testing.
To access DOCSIS Mode, use the arrow keys to highlight
the DOCSIS option on the Measure mode menu
(Figure 14 on page
SHIFT key and the DOCSIS softkey.) The first DOCSIS
mode screen you see will look similar to
DSAM Product Family Quick-Start Guide Rev. G
28), and press ENTER. (Or, press the
Figure 19.