Comtech EF Data CDM-625 Installation And Operation Manual page 447

CDM-625 Advanced Satellite Modem
Quality of Service (QoS)
•
The data rate for each port is as follows:
Port
4
3
2
1
ANSWER "B" – For HW Ver. Rev 1.1 and older:
•
Based on Table 20-1 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 20-2, 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 1600 Kbps
1 (b001) 1
N/A 1
Total ►
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
2 Mbps 800Kbps
2 Mbps 800 Kbps
5.3 Mbps 4 Mbps
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
20–9
Revision 13
MN-CDM625
Remaining Data Rate (After
Serving the Priority Queue)
3200 Kbps
1600 Kbps
800Kbps
800 Kbps
0 Mbps
Remaining Data Rate (After
Serving the Priority Queue)
3200 Kbps
1600 Kbps
800Kbps
800 Kbps
0 Mbps