Cisco Headend Digital Broadband Delivery System
Chapter 2 Optimize Your System Performance for Downloads and Staging
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Calculate and Change the OOB CVT Message Cycle Time
Calculate Your Optimum OOB CVT Message Cycle Time
We have determined that the optimal cycle time for transmission of OOB CVT
We have determined that the optimal cycle time for transmission of OOB CVT
messages is one-half the cycle time of the OSM carousel plus one minute.
Adjusting the cycle time of the CVT messages allows you to decrease the staging
Adjusting the cycle time of the CVT messages allows you to decrease the staging
times for set-tops.
Important: You must have one of the following system releases before you can
Important: You must have one of the following system releases before you can
change the CVT message cycle time for your system:
SR 4.0 Service Pack 3 (Patch 3 - 4.0.0.33EP3) or higher
SR 4.2 Service Pack 0.2 (Patch 1 - 4.2.0.24p2.1EP1) or higher
Calculating the Optimum OOB CVT Message Cycle Time
Important: The procedures contained in this document should be repeated
Important: The procedures contained in this document should be repeated
whenever you add or remove files from your bootloader carousel.
The optimal cycle time for transmission of OOB CVT messages is one-half the cycle
The optimal cycle time for transmission of OOB CVT messages is one-half the cycle
time of the OSM carousel plus 1 minute (in seconds), or ((OSM/ 2) + 60).
Follow these steps to calculate the optimum CVT message cycle time for your
Follow these steps to calculate the optimum CVT message cycle time for your
system:
1 Generate a Doctor report.
2 In the Doctor report, locate the section with the heading BFS Carousel and OSM
1 Generate a Doctor report.
2 In the Doctor report, locate the section with the heading BFS Carousel and OSM
Sessions Status.
3 Locate the line in this section that indicates the status of the Bootloader carousel.
The status of the bootloader should be the last line in this section, just before a
row that indicates the Aggregate IB Carousel Datarate.
Example:
Example:
=Datarate= =KBytes= =Intrvl=
=Enabled=
=Enabled=
NOTE : The following contribute to the aggregate data rate but are managed by
OSM.
OSM.
OK: Bootloader IB s( 199) up 3.00 Mbps 108180.000 n/a Y
4 Locate the entry that indicates the size (in Kilobytes) of the carousel. In the
example above, this value is 108180.000 KB.
5 Multiply the number of Kilobytes of the carousel by 0.008 to find the number of
megabits in the carousel.
Example: 108180.000 x 0.008 = 865.440 Megabits.
Example: 108180.000 x 0.008 = 865.440 Megabits.