Hughes HX System, System Overview

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Chapter 5 • Bandwidth management
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Advanced bandwidth
management
techniques
The HX System has advanced bandwidth management tools that
advise the operator how much outbound and inbound bandwidth
has been consumed by various CBR and CIR services, as well as
how much bandwidth is available for the best effort services.
These tools, which provide a variety of statistical and status
information, allow an operator to intelligently load the network
and understand to what extent the network is over-subscribed.
The CBR traffic is assigned the highest priority, followed by CIR
traffic. CBR and CIR are serviced before assignment of
bandwidth for best effort services.
Preassigned CBR services With this bandwidth management scheme, satellite routers can be
configured (preassigned) to consume a fixed amount
constant bit
rate (CBR), and this bit rate can be configured independently for
the outbound and inbound directions. For example, a satellite
router can be configured with a 512 kbps inbound CIR and a 256
kbps outbound CBR. Additionally, the satellite router can be
configured to deallocate the bandwidth if the channel has been
idle for a configurable period of time.
CBR services operate similar to single channel per carrier
(SCPC) links, as the assigned bandwidth per channel is fixed,
based on the configuration of the link.
Outroute CBR
Statically configured Constant Bit Rate requirements (Hard QoS
configuration per VSAT):
•
CBR traffic is assigned the highest priority, ahead of CIR and
Best Effort.
•
The CBR bit rates values range from 32 Kbps to the IP
gateway CIR
•
CBR users are not allowed to pass traffic in excess of the
CBR bit rate.
•
CBR configuration specifies the bit rate on a per-remote
basis.
•
The IP gateway supports remotes with different outroute
CBR requirements.
Adaptive CBR with step
increments
In this bandwidth assignment service, satellite routers are
allocated bandwidth based on the following parameters:
•
Minimum CBR – The amount of bandwidth that will be
immediately allocated to a satellite router at the initiation of a
Note: The idle timeout feature can be disabled in order to
configure nailed-up bandwidth assignment.