Cisco Headend Digital Broadband Delivery System Release Notes

 

8 

4003389 Rev B 

This section provides a brief overview of the tasks you must complete to upgrade 
the Model D9476 QAM Modulator with QAM software version 2.4. 

 

Before you upgrade to QAM software version 2.4, be sure that your system meets 
the configuration specified in About QAM Software Version 2.4 (on page 2). 

If you will not download QAM software version 2.4 from a File Transfer Protocol 
(FTP) site, make sure that you have obtained the CD QAM V2.4, part number 
4013527. 

Important! Do not proceed with installing QAM software version 2.4 until you have 
read and followed the directives in About QAM Software Version 2.4 (on page 2). 

 

When upgrading QAM modulators with QAM software version 2.4, consider the 
following tasks and the amount of time required for each: 

 

Completing pre-upgrade tasks takes from 35 to 50 minutes. 
Note: If you are upgrading from an FTP site, allow an additional 10 to 15 
minutes to download QAM software from the FTP site. The speed of the 
connection and the size of the files determine the download time. 

 

Downloading QAM software version 2.4 to a QAM modulator takes about 5 
minutes for each QAM modulator. 

 

Verifying the functionality of a QAM modulator depends on the number of 
sessions that the modulator carries and takes approximately 5 to 10 minutes. 

Note: It is not necessary to rebuild non-VOD sessions on the QAM modulators that 
you upgrade. The non-VOD sessions are rebuilt automatically after QAM software 
version 2.4 is downloaded to a QAM modulator. 

 

When QAM modulators are reset (rebooted) during the upgrade, the services they 
carry are interrupted. DHCTs will show a frozen picture or black screen until the 
upgrade is complete and the DNCS has restarted all of the active sessions on the 
QAM modulator.