Comtech EF Data CDM-625 - Manual (Page 436)

CDM-625 Advanced Satellite Modem Revision 15
Quality of Service (QoS) MN-CDM625
20–4
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.
• 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.