Comtech EF Data CDM-760 - Manual (Page 411)

Appendix K Revision 2
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
K–11
K.4.2.3.3 Example 3
• Select Min/Max as the QoS Mode.
• Configure each queue with minimum bandwidth and cost as shown in Table K-8.
• The total available bandwidth is 5000 kbps.
Calculate each individual allocated kbps.
Table K-8. Example 3 – QoS Classification
Queue Min BW (kbps) Weight Allowed BW
Q1 2000 9 – –
Q2 4000 8 – –
Q3 6000 7 – –
Q4 8000 6 – –
Total ► 20000 30 5000
Table K-9. Example 3 Solution – Calculated BW Allocation
Queue
1 st Round 2 nd round N th round Final
kbps Weight Given Leftover Weight Given Leftover Weight Given Leftover
Q1 9 1500 – – – – – – – – – – – – – – 1500
Q2 8 1334 – – – – – – – – – – – – – – 1334
Q3 7 1166 – – – – – – – – – – 1166
Q4 6 1000 – – – – – – – – – – 1000
Total ► 30 5000 0 0 0 0 0 5000
Table K-9 displays the solution for Example 3.
Step 1 – Calculate each bandwidth share, based on total weights (30) and available bandwidth
(5000 kbps):
• Q1 = 5000 * (9/30) = 1500 kbps
• Q2 = 5000 * (8/30) = 1334 kbps
• Q3 = 5000 * (7/30) = 1166 kbps
• Q4 = 5000 * (6/30) = 1000 kbps
Step 2 – After the first round, there is no more leftover bandwidth and the calculation loop
stops here.
Step 3 – Each queue’s share after all rounds: