Chapter 5 • Bandwidth management
1037852-0001 Revision A
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• Servicing of CIR users with CIR level between the minCIR
and the maxCIR bit rate should not be at the expense of CIR
users with CIR level below their respective minCIR.
• Outroute multicast traffic is not included in the computation
of users’ CIR levels.
Best effort services
A satellite router that is configured for best effort services is
eligible to receive backlog, periodic, and left-over bandwidth.
When a satellite router is configured for best effort services, the
amount of bandwidth it receives is based on the backlog amount.
This is the satellite router’s estimation of how much bandwidth it
needs at any given amount.
Best effort users can be assigned (optionally) to an IQoS plan.
The IQoS plan defines the maximum amount of bandwidth
available to a group of satellite routers as they access the dynamic
stream bandwidth. The HX System supports multiple IQoS plans,
allowing operators to provide different levels of best effort
services to different groups of customers.
Best effort utilizes the remaining bandwidth after meeting the
requirements for guaranteed CBR and CIR bit rate services.
Bandwidth terminology
Operators need to be familiar with the following bandwidth
related terms:
• Backlog - the estimated amount of data queued in a satellite
router that is awaiting to be sent to the hub.
• Periodic - bandwidth that is periodically assigned to satellite
routers based upon configuration.
• Left-over - bandwidth that has not yet been assigned and is
distributed evenly to active satellite routers.
• Nailed-up - bandwidth that is assigned by the DNCC to a
satellite router regardless of usage.
• Activity - bandwidth assigned solely on usage.
Traffic prioritization
Networks must be able to prioritize traffic to ensure that
business-critical applications do not suffer due to bandwidth
contention with less important applications. Traffic prioritization
comprises the following:
• Soft QoS (or Application Level Quality of Service) - Traffic
prioritization is based on the application.
In the outroute direction, the IPv4 traffic destined for a
terminal is prioritized based on the application type in the
queued IP packets.
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