Comtech EF Data CDM-760 - Example 2

Appendix K Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
K–8
Step 3 – The leftover 24000 kbps is available for Priority 4 queues (this example specifies no
Priority 3 queues). The Ingress DR in the Priority 4 queues is 28000 kbps. Because the available
bandwidth is only 24000 kbps, the bandwidth is therefore shared as per the configured weights.
The total weights are (2+4) = 6.
Step 4 – Calculate each bandwidth share, based on the total weights (6) and bandwidth
availability (24 000 kbps):
• Q3 = 24000 * (2/6) = 8000 kbps
• Q4 = 24000 * (4/6) = 16000 kbps
K.4.2.3.2 Example 2
• Select Min/Max as the QoS Mode.
• Configure each queue with minimum bandwidth (Min BW), maximum bandwidth (Max BW),
and weight as shown in Table K-6.
• The total available bandwidth is 30000 kbps.
Calculate each individual allocated kbps.
Table K-6. Example 2 – QoS Classification
Queue Min BW (kbps) Max BW (kbps)
Delta Max BW
(Max-Min)
(kbps)
Weight Allowed BW
Q1 2000 4000 2000 9 – –
Q2 4000 8000 4000 8 – –
Q3
6000
16000
8000
7
– –
Q4
8000 8000 0 6 – –
Total ► 20000 40000 14000 30 30000
Table K-7. Example 2 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
3750
1750
– –
– –
– –
– –
– –
– –
2000
Q2
8
3334
– –
8
934
268
– –
– –
– –
4000
Q3
7
2916
– –
7
816
– –
7
268
– –
4000
Q4
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
Total ►
24
10000
1750
15
268
7
0
0
10000
Table K-7 displays the solution for Example 2.