Cisco Headend System Release 2.7 Installation Guide

 

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4022900 Rev C 

Before you upgrade to GQAM software version 4.2.1, be sure that your system meets 

the criteria specified in System Release Compatibility and Prerequisites (on page 7) 

and Application Platform Release Dependencies (on page 8). 
If you will not be downloading the GQAM software from our File Transfer Protocol 

(FTP) site, make sure that you have obtained the CD, GQAM V4.2.1, part number 

4021954. 

 

When upgrading GQAMs with the new software, consider the following tasks and 

the amount of time required for each: 

 

Completing pre-upgrade tasks takes from 30 to 45 minutes. 

 

If you are upgrading from an FTP site, allow an additional 10 to 15 minutes to 

download the software from the FTP site. The speed of the connection and the 

size of the files will determine the actual download time. 

 

Downloading new software to the GQAM takes approximately 8 minutes for 

each modulator. 

 

For GQAMs that carry broadcast sessions, the DNCS will restart the sessions 

after the GQAMs load new software. 

 

For GQAMs that carry VOD sessions, only those sessions that are determined to 

be active will be restarted. Because subscribers may tune away when the GQAM 

reboots, the total number of recovered sessions may not match the original 

number of sessions on the GQAMs. 

Note: It is not necessary to rebuild non-VOD sessions on the GQAMs that you 

upgrade. The non-VOD sessions are rebuilt automatically after the new software is 

downloaded to the GQAM. 

 

When GQAMs 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 GQAM.