Cisco Headend System Release 2.5 User Guide

7-2 

Managing Updates 

4011043 Rev B 

Overview, Continued 

The TSBroadcaster updates the content of the output transport stream when the file 

system changes. If the updated file is selected for rapid update and the new content 

fits within the maximum size of the file, the update is preemptively inserted into the 

output transport stream. In all other cases, the carousel is re-built, allowing the 

module structure to adapt to the new content. This process takes longer than a rapid 

update, and is subject to a minimum rebuild interval to ensure carousel stability.  
When the TSBroadcaster performs an update, it does not change the application set. 

An update changes the copy of the application set that is currently being played out. 

When the playout stops, all updates are lost. Whenever an application starts being 

played out, it will start playing out its original content with polled updates re-

applied, if necessary. 

This chapter contains the following topics.