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