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CDM-625 Advanced Satellite Modem
Quality of Service (QoS)
QUESTION: What is the total output data rate and what is individual ports output data rate?
ANSWER "A" – For HW Ver. Rev 2.1 and newer:
•
Based on Table 20-1 for a modem Tx bandwidth of 1 Mbps, the QoS output bandwidth is set
to 1 Mbps.
•
Total Input data rate is 4X 250 Kbps = 1 Mbps
•
The output Data rate = 1 Mbps
•
Each ports data rate = 250 Kbps
ANSWER "B" – For HW Ver. Rev 1.1 and older:
•
Based on Table 20-1 for a modem Tx bandwidth of 1 Mbps, the QoS output bandwidth is set
to 1 Mbps.
•
Total Input data rate is 4X 250 Kbps = 1 Mbps
•
The output Data rate = 1 Mbps
•
Each ports data rate = 250 Kbps
QoS Example 3
•
Port-based Layer 2 QoS mode is selected.
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Port Layer 2 QoS Priorities are set as follows:
o Port 1 priority is set to 1;
o Port 2 priority is set to 2;
o Port 3 priority is set to 3;
o Port 4 priority is set to 4.
•
The modem data rate is set to 2500 Kbps.
•
The ingress traffic on Ports 1 and 2 are set to 2 Mbps.
•
The ingress traffic on Port 3 is set to 800 Kbps.
•
The ingress traffic on Port 4 is set to 500 Kbps.
20–4
Revision 13
MN-CDM625
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