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CDM-625A Advanced Satellite Modem
Appendix R
•
Port 3 priority is set to 3;
•
Ports 2 and 4 priorities are set to trunk mode (native disabled).
3) The modem data rate is set to 4000 Kbps.
4) The ingress traffic on Port 1 is set to 2 Mbps.
5) The ingress traffic on Port 3 is set to 1600 Kbps.
6) The ingress traffic on Port 2 is set to 2000 Kbps with a VLAN Priority of 1.
7) The ingress traffic on Port 4 is set to 800 Kbps with a VLAN Priority of 7.
QUESTION: What is the total output data rate and what are the individual port output data
rates?
ANSWER "A" – For HW Ver. Rev 2.1 and newer:
•
Based on Table R-1 for a modem Tx bandwidth of 4 Mbps, the QoS output bandwidth is set
to 4 Mbps.
•
Since the modem Tx bandwidth and QoS output data rates are the same, there is no need
for normalization.
•
Based on Table R-2, the VLAN Priorities 7 and 1 are mapped, respectively, to L2 QoS
Priorities 4 and 1.
•
The data rate for each port is as follows:
Port
4
3
2
1
VLAN
L2 QoS
Input Data Rate
Priority
Priority
7 (b111)
4
N/A
3
1 (b001)
1
N/A
1
Total ►
1) Layer 2 QoS can be enabled only when the optional Packet Processor is
not enabled.
2) Layer 2 QoS is implemented on System on Chip (SoC) hardware with a
total queue memory of 1 Mbits (128 Kbytes). Layer 2 QoS therefore
cannot accept traffic bursts requiring more than 128 Kbytes of storage.
QoS Output Data Rate
= Modem Output Data
Rate
800 Kbps
800 Kbps
1600 Kbps
1600 Kbps
2 Mbps
800Kbps
2 Mbps
800 Kbps
5.3 Mbps
4 Mbps
R–7
MN-CDM625A
Revision 4
Remaining Data Rate (After
Serving the Priority Queue)
3200 Kbps
1600 Kbps
800Kbps
800 Kbps
0 Mbps
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