Cisco Headend System Release 2.7 Maintenance Manual
Chapter 2 Optimize Your System Performance for Downloads and Staging
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4024836 Rev D
Recommendations to Improve Your Data Carousel
Rate
Operators of our DBDS have flexibility in managing both the content and the
performance characteristics of their data carousels. This chapter provides
background information and recommendations for managing inband and out-of-
band data carousel rates on the DNCS. It also provides a procedure for verifying
data carousel rate settings and changing them, if necessary.
Note: The terms data carousels and data pumps are sometimes used interchangeably.
Note: The terms data carousels and data pumps are sometimes used interchangeably.
SARA Data Carousel Rate Settings
The following table lists the default data carousel rate settings for systems that use
SARA. The footnote numbers are explained on the following page. Also, refer to
General Notes About the SARA Data Carousel Rate Settings (on page 65) for more
general information about the SARA carousels and source IDs.
Source
ID
Data Carousel
Data Rate
(Mbps)
Block Size
(Bytes)
Indication
Interval (ms)
Enabled/Run
(see note 1)
0
System Carousel
0.01
1024
200
x
1
Out-of-Band
0.05
See note 6
1024
200
x
2
Inband
1.00
4000
100
x
3
CAM OOB
0.01
1024
200
x
4
CAM IB
1.00
4000
100
See note 2
5
IPG OOB
0.05
1024
200
x
6
IPG1 IB
1.00
4000
100
x
7
PPV OOB
0.01
1024
200
x
8
PPV IB
1.00
4000
100
x
9
SAM
0.05
1024
200
x
10
IPG2 IB
1.00
4000
100
x
11
podData
0.03
1024
200
x
12
IPG3 IB
1.00
4000
100
x
14
IPG4 IB
1.00
4000
100
x
16
IPG5 IB
1.00
4000
100
x
18
IPG6 IB
1.00
4000
100
x
20
IPG7 IB
1.00
4000
100
x
21
MMM OOB
0.10
1024
200
x