Example 3 - Comtech EF Data CDM-760 Installation And Operation Manual

Appendix K
CDM-760 Advanced High-Speed Trunking Modem
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.
Queue
Q1
Q2
Q3
Q4
Total ►
Table K-9. Example 3 Solution – Calculated BW Allocation
Queue
Weight
Q1
9
Q2 8
Q3
7
Q4 6
Total ►
30
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:
•
Q1 = 1500 kbps
•
Q2 = 1334 kbps
•
Q3 = 1166 kbps
•
Q4 = 1000 kbps
Table K-8. Example 3 – QoS Classification
Min BW (kbps)
2000
4000
6000
8000
20000
1 Round
st
Given Leftover Weight
1500 – – – –
1334 – – – –
1166 – –
1000 – –
5000 0
K–10
Weight
9
8
7
6
30
2 round
nd
Given Leftover Weight
– – – – – –
– – – – – –
– – – –
– – – –
0 0
Revision 4
MN-CDM760
Allowed BW
– –
– –
– –
– –
5000
N round
Final
th
kbps
Given Leftover
– – – – 1500
– – – – 1334
– – – – 1166
– – – – 1000
0 0 5000