Comtech EF Data CDM-760 - Operational Examples; Example 1; K.4.2.3 Operational Examples

Appendix K Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
K–7
K.4.2.3 Operational Examples
K.4.2.3.1 Example 1
• Select Max/Priority as the QoS Mode.
• Configure each queue with maximum bandwidth (Max BW), priority, and weight as shown in
Table K-3.
• The total available bandwidth is 30000 kbps.
Calculate each individual allocated kbps.
Table K-3. Example 1 – QoS Classification
Queue
Priority
Max BW (kbps)
Weight
Allowed BW
Q1 1 999999 100 – –
Q2 2 999999 100 – –
Q3 4 16000 2 – –
Q4
4
8000
4
– –
Total ► 30000
Table K-4. Example 1 – Ingress Traffic
Queue
Ingress DR (kbps)
Max BW (kbps)
Weight
Allowed BW
Q1
4000 999999 100 – –
Q2 2000 999999 100 – –
Q3
14000
50000
2
– –
Q4
14000 50000 4 – –
Total ► 30000
Table K-5. Example 1 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
100
30000
26000
– –
– –
– –
– –
– –
– –
4000
Q2
– –
– –
– –
100
26000
24000
– –
– –
– –
2000
Q3
– –
– –
– –
– –
– –
– –
2
8000
– –
8000
Q4
– –
– –
– –
– –
– –
– –
4
16000
– –
16000
Total ►
– –
30000
26000
15
– –
268
6
0
0
30000
Table K-5 displays the solution for Example 1.
Step 1 – The total available bandwidth for the Priority 1 queue is 30000 kbps, but the Ingress DR
is only 4000 kbps. Hence the Priory 1 queue takes only 4000 kbps and the remaining bandwidth
is left for lower-priority queues.
Step 2 – The leftover 26000 kbps is available for the Priority 2 queue. Remember that the
Priority 2 queue only requires 2000 kbps. The Priority 2 queues therefore take only 2000 kbps,
and the remaining bandwidth is left for lower-priority queues.