Cisco DNCS System Release 2.7 3.7 4.2 安装指南
How Long Does Each Phase Take?
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Scheduling Considerations
If you are loading new code for new device types, you can schedule the installation
at any time. There is no impact on existing devices or normal system operations.
Phase Two can impact your ability to stage some DHCTs. During this phase, you
Phase Two can impact your ability to stage some DHCTs. During this phase, you
might not be able to stage DHCTs being upgraded using the OSM download method
until the new client application platform software is installed. CVT testing can be
completed without impacting staging.
Phase Three impacts your subscribers' viewing experiences. Carefully plan and
Phase Three impacts your subscribers' viewing experiences. Carefully plan and
schedule the installation so that the impact is minimal to your subscribers. The
impact is based on the download option you select, as follows:
Normal (CVT) or Deferred (OSM) download—Lets the DHCT load software after
it is powered off for 2 minutes
Immediate (CVT) or Download Now No Reply (OSM) download—Happens in a
relatively short period of time, but interrupts watching TV, PPV, VOD, and other
services
How Does the Download Affect the System?
Until you actually download the software across your system, there is no
performance impact to your subscribers. After the system-wide download is started,
any device being upgraded is unavailable while downloading the software.
Therefore, Cisco recommends that you perform Phase Three of these procedures
during a maintenance window.
In addition to the outage caused by loading the software, two-way hosts and DHCTs
In addition to the outage caused by loading the software, two-way hosts and DHCTs
will have to re-establish their network connections. This can cause interactive
services to be temporarily unavailable after a software download.
After Completing Each Phase
Each of the "Phase" chapters in this document provides a checklist of the tasks
required for that phase. After you complete each phase, save a copy of the checklist
and all of the results from any tests that you run. You should not proceed to the next
phase until the checklist for the previous phase is complete.