CDM-570A/570AL Satellite Modem with Optional Packet Processor
Revision 5
Advanced Quality of Service (QoS) Option L–13 MN-CDM570A
QUESTION: What will be the total data rate and what will be the individual data rates?
ANSWER:
• After serving all high priority queues, only 500 Kbps is left for ASFD classes.
• This leftover bandwidth is less than the total minimum bandwidth; it must therefore share
the residual 500 Kbps among all four ASFD classes equally - i.e., 500/4=175 Kbps per
class.
• Since ASFD4 has the service rate 100 Kbps, the excess 75 Kbps will be given the other
queues where the service rate not met.
• In this case the 75 Kbps again will share equally among ASFD3, ASFD2, and ASFD1
since these service rates were not met.
The resulting individual data rate is as follows:
Stream Priority
Input Data rate
Leftover BW (After
Serving the Queue)
QoS output Data rate
L.3 Glossary of Terms
Filtering – QoS allows specific flows to be designated as “filtered,” whereby the IP Packet
Processor discards traffic that is otherwise not wanted for forwarding over a satellite link.
Jitter – Measured in milliseconds, this is the amount of variation between two consequent frames
at the receiving end.
Latency – This is the amount of delay, measured in milliseconds, from Ethernet interface of the
near -end modem to the Ethernet interface of the far-end modem.
Maximum Bandwidth – This value can be assigned to a flow to restrict the Maximum Bandwidth
that any particular flow will utilize; otherwise, the default of no bandwidth restriction can be
selected.
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