Cisco Model 6109 6 MHz Off-Air Reference (NTSC) Guide De Montage

 

78-4021139-01 Rev D 

357 

 

The main purpose of the USRM bandwidth reclamation feature is to allow the server 

to reclaim unused bandwidth, i.e., bandwidth with no active end users, if that 

bandwidth is needed to satisfy another request. 
In normal operation, i.e. the default setting of RecaptureMode = OnDemand, the 

USRM will not reclaim bandwidth unless it is actually needed even though all of the 

conditions for bandwidth reclamation have been met. There is another setting 

(RecaptureMode = Immediate) which causes the USRM to reclaim all available 

bandwidth immediately, regardless of USRM need, after the conditions for 

bandwidth reclamation are met. 
The USRM is designed to log all user activity, whether it is channel change requests 

or simply increasing volume or pulling up a menu. Any remote keystroke is 

considered user activity. 
User activity is monitored to determine if bandwidth reclamation conditions are met 

as follows: 

 

If an active user stays on a particular channel and generates activity, at the end of 

the STB Reporting Interval a Last User Activity (LUA) report is sent from the 

client to the Server, noting the time of the last user activity. 

 

If a user remains on a single channel and does not generate activity, a LUA 

report will not be sent at the end of the time period. 

 

If a STB Reporting Interval passes without any user activity, then the next 

activity will cause a LUA report to be sent immediately, i.e., it does not wait until 

the end of the next STB Reporting Interval, and the STB Reporting Interval timer 

is reset. 

 

Recapture Time at the USRM is reset upon the receipt of any LUA report from 

that set-top box for activity that occurs after the Recapture Time period has 

begun. 

The bandwidth reclamation process is started if Recapture Time expires without the 

server receiving any LUA reports. 
Note: This assumes only one set-top box is tuned to the program. If other set-top 

boxes are watching the same program, the bandwidth reclamation process will not 

begin until all set-top boxes meet these bandwidth recapture requirements.