Cisco Model D9479 Gigabit QAM Modulator Installation Guide

 

10 

78-740242-01 Rev B 

Before you upgrade to QAM 2.5.1, be sure that your system meets the criteria 

specified in System Release Compatibility and Prerequisites (on page 3) and Cisco 

Application Platform Release Dependencies (on page 3). 
If you will not be downloading the QAM software from the Cisco File Transfer 

Protocol (FTP) site, make sure that you have obtained the CD, QAM Software 

V2.5.1, part number 4016663. 

When upgrading QAMs 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 QAM takes approximately 5 minutes for each 

modulator. 

 

For QAMs that carry broadcast sessions, the DNCS will restart the sessions after 

the QAMs load new software. 

 

For QAMs that carry VOD sessions, only those sessions that are determined to be 

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

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

number of sessions on the QAMs. 

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

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

downloaded to the QAM. 

 

When QAMs 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.