Cisco DNCS System Release 2.8.1 3.8.1 4.3.1 ユーザーガイド

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



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.



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.

7.

Is there enough bandwidth to add the new bootloader carousels? (Bootloader carousels require data

rates between 1.00 and 3.00 Mbps.)



If yes, go to 



If no, refer to Recommendations for Data Carousel Rate Management Technical Bulletin (part

number 716377) for details on how to increase the bandwidth of your system.