Comtech EF Data MDX420 SkyWire Manual - Manual (Page 117)

MDX420 SkyWire™ Satellite Network Gateway SkyWire QoS
MN-MDX420 Revision 6 C–7
C.3.3 Programmable Egress Policies
SkyWire provides the network administrator with the following QOS settings that control how the
data is routed out of the four prioritized queues and into the burst modulator.
C.3.4 Fair Weighted Queuing
A fair weighted priority scheme allows higher priority traffic to move quickly through the system,
while at the same time insuring that lower priority traffic isn't stalled indefinitely. When Fair
Weighted queuing is selected, packets will be transmitted at a rate of 8, 4, 2, and 1 from the
highest to lowest priority queues respectively.
Network Queue
Voice
Network Controls
Critical Queue
Video
Controlled Load
Immediate Queue
Excellent Effort
Best Effort
Routine Queue
Bulk Traffic
8 x Output
4 x Output
2 x Output
1 x Output
Queue
Manager
Packets In Packets Out
Fair Weighted Traffic Flow
C.3.5 Strict Priority Queuing
A strict priority scheme means that the highest priority traffic will always be transmitted first, even
if it means that the lower priority traffic is stalled indefinitely. When Strict Priority queuing is
selected, packets in the highest priority queue will be transmitted until that queue is empty. At
that time, packets from the next highest priority queue will be transmitted until it is either empty or
a higher priority packet arrives. If a higher priority packet arrives before a lower priority queue is
empty, it will immediately go to the head of the line and be the next packet transmitted. Care
needs to be taken when selecting this option as it is entirely possible that data in a lower priority
queue might never be transmitted.