Cisco Headend System Release 2.7 Manuale Di Manutenzione
Chapter 2 Optimize Your System Performance for Downloads and Staging
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If you need to send an image out to a device population quickly, you might
create one carousel to carry this image.
Note: Faster downloads can sometimes be realized by increasing the data rate for the
existing 199 bootloader carousel. Keep in mind that this strategy works only when
using DHCTs (set-tops) that support download data rates greater than 10 Mbps.
Set Up Multiple Bootloader Carousels
This section provides an overview of the steps required to set up more than one
bootloader carousel and configure set-tops to use the correct carousel when
downloading images.
1 Verify that the BFS QAM has enough bandwidth to support a second bootloader
carousel. To make this determination, go to Determine Available Bandwidth for
Multiple Bootloaders (on page 55).
2 Add the new bootloader carousel to the DHCT by adding a bootloader source
with the following characteristics to the BFS Administration window.
Note: For assistance adding a bootloader source to the BFS Administration
Note: For assistance adding a bootloader source to the BFS Administration
window, go to Add a Bootloader Source to the DNCS (on page 59).
Source Name - Enter a name to describe this source; for example,
Bootloader2.
Source ID - Ideally, we recommend that you select an even number that is
not in use and that is greater than 200 to correspond with our numbering
convention.
Source Type - Select Bootloader.
Transport Type - Select ASI In-band.
Data Rate - The rate depends on several factors, including the DHCT type,
the BFS QAM setting, and the available bandwidth. When you make this
decision, select a rate between 1.00 and 3.00 Mbps. For assistance, refer to
Recommendations for Data Carousel Rate Management Technical Bulletin (part
number 716377).
Important: When you stage SCC DHCTs, use a data rate of 3.00 Mbps.
Important: When you stage SCC DHCTs, use a data rate of 3.00 Mbps.
Block size - Enter 4000.
Indication Interval - Enter 100.
DataPump - Set to run.
Note: If your system uses the RCS feature, skip this field.
Note: If your system uses the RCS feature, skip this field.
Selected Hosts - Select the same hosts as the main Bootloader source.
3 Configure set-tops to use the correct bootloader carousel when downloading
images. For assistance, go to Set Up DHCTs to Download Images from a Specific
Bootloader Carousel (on page 60).