Comtech EF Data CDM-760, Installation And Operation Manual

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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.