CDM-840 Remote Router MN-CDM840
Appendix J Revision 3
J–2
allocated to meet customer demands. This metric allows operators the ability to “safely”
oversubscribe the satellite bandwidth purchased.
• Clipping – The process of the QoS Scheduler’s discard of packets, when the traffic level for a
queue exceeds the Max BW (Maximum Bandwidth) or MIR (Maximum Information Rate).
• Jitter – The amount of variation that is measured, in milliseconds, between two consequent
frames at the receiving end.
• Latency – The time it takes for a packet to be transmitted, as measured from one point to
another. For the purposes of Advanced VSAT, latency is the amount of delay that is
measured, in milliseconds, from the Ethernet interface of the near-end modem to the
Ethernet interface of the far-end modem.
• Maximum Clipping Rate – In Max/Pri (Maximum/Priority), Min/Max (Minimum/Maximum),
and Pri-Weighted (Priority/Weighted) QoS Control Modes, you can define the maximum
amount of data rate to be allocated to a queue. Maximum Clipping Rate can also be referred
to as Max BW or MIR.
• Priority – In Max/Pri and Pri-Weighted QoS Control Modes, you may define a Priority level
of 1 through 8 for a flow. For example, a Priority 1 queue schedules and drains before a
Priority 2 queue; similarly, Priority 2 packets will schedule and drain before Priority 3
packets, etc.
• QoS Queue Size – The QoS queue size varies and is equal to 1 second’s worth of TX data at
the current data rate.
• Round-robin – The simplest scheduling process, where all packets are equal in priority and
are processed in the order they arrive.
• Tail Drop – The process of discarding packets when a queue is full. Tail Drop is the most
basic queue management process where all packets are treated identically and newly
arriving packets are dropped while the queue is at capacity.
• Traffic Shaping – Also known as 'packet shaping,' this is the practice of regulating network
data transfer to assure a certain level of QoS for some applications or users or to increase
available bandwidth for some other purpose.
• Weight – This is the user-configurable parameter when using Pri-Weighted QoS Control
Mode. The valid Weight ranges are 1 through 9 – the greater the Weight, the higher the
precedence will be given to that queue when draining packets.
For example, given the same Priority Level, more bytes would be drained from those with
Weight = 9 than those with Weight = 8, and so on.
• Weighted Scheduling – Used in Pri-Weighted Mode. The QoS Scheduler calculates each
quantum based on available bandwidth, total weights, and per queue value as follows:
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