Comtec CDM-840 - Page 310

CDM-840 Remote Router MN-CDM840
Appendix J Revision 3
J–16
The QoS Scheduler Calculation Solutions table for Case 3 / Example 2 is as follows:
Queue
Round 1
Round 2
Round ‘N’
Final kbps
Weight
Given
(kbps)
Leftover
(kbps)
Weight
Given
(kbps)
Leftover
(kbps)
Weight
Given
(kbps)
Leftover
(kbps)
1
9
12
–
–
–
–
–
–
–
12
2
8
10.762
–
–
–
–
–
–
–
10.762
3
7
9.328
–
–
–
–
–
–
–
9.328
4
6
8
–
–
–
–
–
–
–
8
Total ►
30
40
0
0
0
0
0
0
0
40
This table shows the result of the steps taken to calculate the individual allocated
bandwidths:
1. Calculate the bandwidth for each queue based on the total weight (30) and the available
bandwidth of 64 kbps (8000 bytes).
o Queue 1 = 8000 * (9 / 30) = 2400 bytes (19.2 kbps)
o Queue 2 = 8000 * (8 / 30) = 2133 bytes (17.064 kbps)
o Queue 3 = 8000 * (7 / 30) = 1866 bytes (14.928 kbps)
o Queue 4 = 8000 * (6 / 30) = 1600 bytes (12.8 kbps)
2. After Round 1, only Queues 3 and 4 have yet to reach their minimum bandwidth.
Calculate the bandwidth for each queue based on the total weight (13) and the available
bandwidth (1534 bytes):
o Queue 3 = 1534 * (7 / 13) = 826 bytes (6.608 kbps)
o Queue 4 = 8000 * (6 / 30) = 708 bytes (5.664 kbps)
After Round 2, all bandwidth is consumed and the calculation loop stops.
Case 3 Example 2 Summary – Each queue’s share is as follows:
 Queue 1 = 1000 bytes (8 kbps)
 Queue 2 = 2000 bytes (16 kpbs)
 Queue 3 = 2692 bytes (21.536 kbps)
 Queue 4 = 2308 bytes (18.464 kbps)