Cisco DNCS System Release 2.8.1 3.8.1 4.3.1 Mode D'Emploi
Adding a QPSK Demodulator
Important: Be very careful when you add a QPSK demodulator to the DNCS. Incorrectly configuring
demodulators causes large numbers of DHCTs to be classified as non-responding units. In addition, the network
management system will falsely log errors originating from incorrectly configured QPSK demodulators.
demodulators causes large numbers of DHCTs to be classified as non-responding units. In addition, the network
management system will falsely log errors originating from incorrectly configured QPSK demodulators.
After you add a QPSK modulator to the DNCS, complete these steps to add all QPSK demodulators that are
connected to that modulator.
connected to that modulator.
1.
Does a node set exist for this demodulator.
If yes, go to step 2.
If no,
and then go to step 2.
2.
On the DNCS Administrative Console, click the DNCS tab.
3.
Click the Network Element Provisioning tab.
4.
Click QPSK/CMTS. The QPSK/CMTS List window opens.
5.
Select the modulator to which you need to assign this demodulator.
6.
Click File > Demodulators. The QPSK Modem window opens with an illustration of the modulator and
its eight possible port connections.
7.
Click File > New Demod. The Set Up QPSK Demodulator window opens.
8.
.
Use the following fields when you manage a QPSK demodulator in the DNCS.
Field
Description
Port
The port on the QPSK modulator from which this
demodulator receives data.
demodulator receives data.
Note: This field is not editable. The only time you can
change this field is when creating a QPSK demodulator.
change this field is when creating a QPSK demodulator.
Node Set Name
The node set that you want to associate with this
demodulator.
demodulator.
Important: We recommend that you assign each
demodulator to a unique node set.
demodulator to a unique node set.
Frequency
The RF input frequency assigned to this modulator. You
can enter a value from 8 to 26.5 MHz, based on your
plant design.
can enter a value from 8 to 26.5 MHz, based on your
plant design.
Important: We recommend the following guidelines:
Set this value to equal the service
channel frequency of the associated
modulator. (The service channel
frequency of the QPSK modulator is
shown in the Advanced Parameters tab
of the Set Up QPSK modulator
window.)
modulator. (The service channel
frequency of the QPSK modulator is
shown in the Advanced Parameters tab
of the Set Up QPSK modulator
window.)
Set all demodulators associated with
the same modulator to the same
frequency.
frequency.
9.
Check the associated modulator service channel frequency (on the Advanced Parameters tab of the
QPSK modulator window). The QPSK modulator's service channel frequency must match the frequency
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