Cisco Headend System Release 2.5 Release Notes

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4001159 Rev B 
What Are the Site Requirements? 
3-5 
Scheduling Requirements 
How Long Does It Take to Complete the Upgrade? 
With the live upgrade, your site only needs to be down for 2 to 3 hours during the 
entire upgrade process. Most of the upgrade procedures have no system impact. The 
pre-install and pre-upgrade steps can be performed at any time of day. However, the 
actual upgrade process normally takes place during a maintenance window beginning 
at midnight. The following table provides a breakdown of each upgrade process. 
Process 
Length of Time 
Activity 
Pre-install 
1-3 hours 
Activities are performed by Cisco Services, 
including checking the overall health of the 
system. These activities do not impact the 
system. 
Pre-upgrade 
3-4 hours 
Backing up the system: 
• 
Back up the system components 
• 
Back up the DNCS and Application Server 
files 
• 
Complete system checks 
These activities do not impact the system. 
Upgrade 
6-8 hours total; 
2-3 of these 
hours require 
system outage 
 
Note:  Actual 
time may vary 
based on the 
number of 
devices being 
upgraded. 
Upgrade the DBDS network: 
• 
Back up the DNCS database 
• 
Install the DNCS and Application Server 
software 
• 
Install and download the component 
software (QAM, MQAM, GQAM, and 
QPSK modulator) 
• 
Reboot the hardware 
• 
Complete functional checks 
QPSK modulator upgrades and some QAM 
and MQAM upgrades can be completed with 
little or no subscriber impact. However, 2-3 
hours of the upgrade require system outage. 
Post-Upgrade  3-4 hours 
Back up the system: 
• 
Back up the file system 
• 
Back up the DNCS database 
These activities do not impact the system.