Chapter 5 • Bandwidth management
1037852-0001 Revision A
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Chapter 5
Bandwidth management
Bandwidth management is the collection of techniques used in
the HX system to manage available bandwidth to the greatest
advantage. The HX system uses a variety of techniques to
manage bandwidth to maximize flexibility and adapt to
environmental conditions while providing guaranteed levels of
throughput to meet service level agreements (SLAs) or
demanding real-time media transport requirements.
The following sections describe the bandwidth management
techniques used in the HX system:
• Bandwidth management overview on page 39
• Inroute bandwidth pooling on page 40
• Advanced bandwidth management techniques on page 43
• Traffic prioritization on page 47
• Unlimited combination of service plans on page 49
Bandwidth management
overview
The HX System allows operators to customize bandwidth
assignments for each satellite router to meet individual QoS and
SLA requirements (as compared with the HN System that is
designed to provide a fair distribution of bandwidth across a
broad set of satellite routers within a collective system).
Additionally, the HX System uses variable burst length
transmissions for the inbound route. This is an advantage over
systems that use fixed burst length sizes. Such systems waste a
significant amount of bandwidth because every inbound burst
must be the same size, regardless of actual payload demands. The
Hughes HX System allows the return channel burst size to be
built optimally per satellite router, based on demand.
Extensive and repeated tests on the throughput of the Hughes
inbound system demonstrate inbound efficiency up to 85 percent.
In practical application, this means that the aggregate upstream
performance for a typical inroute easily reaches 85 percent of the
inbound channel rate; for example 1.3 Mbps aggregate upstream
throughput for a 1.6 Mbps return channel.
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