Appendix C
Setting Up Multiple Bootloader Carousels
Determining Available Bandwidth for BFS BIG Systems
This section provides procedures for operators with a BFS BIG to use in determining
how much bandwidth is available for inband sources. To determine the amount of
bandwidth available for additional bootloader carousels, perform the following
calculation:
Total Available Bandwidth - Bandwidth in Use = Available Bandwidth
Notes:
The inband data rate for a 64-QAM is 25 Mbps.
The inband data rate for a 256-QAM is 36 Mbps.
1 Open an xterm window on the DNCS.
2 Type one of the following, based on the system release you have installed:
For SR 4.2.1 and earlier, type cd /export/home/dncs/doctor and press Enter.
For SR 4.3 and later, type cd /dvs/dncs/Utilities/doctor and press Enter.
Note: Be sure to type a space between cd and /.
Result: The current directory is now the doctor directory.
3 Type doctor -bv and press Enter. A table appears and lists the inband and out-of-
band data rates on the BFS carousel. The total inband carousel bandwidth in use
is displayed in the Aggregate IB Carousel Datarate field.
4 Add 1 Mbps to the data rate in the Aggregate IB Carousel Datarate field to
account for any overhead.
Example: If you have a total inband data rate of 14 Mbps, add 1 Mbps for a total
of 15 Mbps in use.
14 + 1 = 15
5 Subtract the total inband carousel bandwidth in use from the total available
bandwidth to determine the unused inband bandwidth on the BFS.
Examples:
64-QAM: From the examples above, the available bandwidth is 10 Mbps.
25 - 15 = 10 Mbps
256-QAM: From the examples above, the available bandwidth is 21 Mbps.
36 - 15 = 21 Mbps
6 Compare the amount of unused bandwidth to the amount of bandwidth
required for the additional bootloader carousels.
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