Cisco DNCS System Release 2.8.1 3.8.1 4.3.1 User Guide

When you change the DHCT Communication Mode (DCM) of an existing QPSK modulator to DOCSIS, you create a
QPSK bridge. A QPSK bridge serves DHCTs in the same hub. For this reason, create one QPSK bridge for every
hub that serves Explorer 8300 DHCTs. After changing the DCMs of the existing QPSK modulators, send a DCM
update message to all of the affected DHCT types so the previously booted DHCTs can operate in DOCSIS Mode.
This procedure describes how to change the DCMs of existing QPSK modulators to DOCSIS mode, and provides a
link to instructions on sending a DCM update message.

Changing the DCM of an existing QPSK modulator takes about one minute.

Changing the DCM of an existing QPSK modulator does not impact network performance. You can complete this
procedure at any time.

Complete the following steps to change the DCM of an existing QPSK modulator.

1.

On the DNCS tab of the DNCS Administrative Console, click the Network Element Provisioning tab.

2.

Click QPSK/CMTS. The QPSK/CMTS List window opens.

3.

Select the row with the bridge name associated with the QPSK whose DCM you want to change.

4.

Click File > Open. The Set Up QPSK Modulator window opens and shows the Basic Parameters tab.

5.

Click DCM > DOCSIS.

6.

Click Save. A warning appears and states that you must send a DCM Updated Message for the new

DCM to take effect.

7.

Click OK. The system returns to the Set Up QPSK Modulator window and the Cancel button changes to

Close. The DHCTs can now boot in DOCSIS mode at startup.

8.

Do you need to change the DCM of another QPSK modulator?



If yes, repeat steps 3 through 7 for to create another QPSK bridge.



If no, go to step 9.

9.

Click Close to return to the QPSK/CMTS List window.

10.

Leave the QPSK/CMTS List window open.

11.

You are ready to send a DCM Updated message to the selected DHCT types and bridges to enable the

.