Chapter 9 Measure Mode – Service Tab
DOCSIS
DSAM Help User Guide Rev. 001 213
Selecting a
Different Channel
Plan
To select a different channel plan
1 Press the Settings softkey.
2 Using the arrow keys, select Channel Plans.
3 Press ENTER.
4 Using the arrow keys, select a channel plan.
5 Press ENTER.
6 Press the Done softkey.
NOTE
The factory default “Min CM Headroom” value is 5 dB.
EXAMPLE 3
You successfully range with the CMTS. Results show that the
CMTS instructed the DSAM to transmit a QSPK carrier and the suc-
cessful transmit level is 42 dBmV. The LEVEL Headroom shown is
the maximum specified level for QSPK of 58 - 42 = 16 dB. Since 16
dB is greater than the 5 dB limit, the measurement passes.
Figure 191 Measure Mode – Downstream Plans
NOTE
See “Editing a Channel Plan” on page 79 for instructions on how to
edit a channel plan.
21128026 R001 DSAM Help User Guide.book Page 213 Thursday, February 5, 2009 2:02 PM
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