Cisco Headend System Release 2.7 설치 가이드
Chapter 2 Upgrading the Software
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4022900 Rev C
Upgrade Process Overview
Before You Begin
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
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.
Time to Complete
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.
Subscriber Impact
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.