Chapter 1 • Overview
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Innovative features
The HX System provides many state-of-the-art features
including:
•
Advanced bandwidth management capabilities
– The HX
System allows operators to easily provision services like
constant bit rate (similar to
single channel per carrier
or
SCPC), minimum
committed information rate
(CIR) with
maximum limits, and
best effort
services. Plus, the HX
System can tailor these service offerings for each satellite
router.
•
DVB-S2
– The HX System uses DVB-S2—the latest
generation satellite transmission standard. In its most basic
form, DVB-S2 incorporates 8PSK or QPSK modulation
together with low-density parity checking (LDPC). The
combination of 8PSK with LDPC produces approximately
30% more bandwidth than DVB-S for the same amount of
satellite power/bandwidth.
•
Adaptive coding and modulation
– The HX System
implementation of DVB-S2 supports
adaptive coding and
modulation (ACM) in the outbound channel, allowing
operators to optimize the outbound channel for each satellite
router. For example, satellite routers in low EiRP regions can
be assigned robust coding and modulation combinations
(QPSK, Rate ½), while satellite routers in beam center can be
assigned bandwidth-efficient coding and modulation
combinations (8PSK, Rate 9/10). The application of ACM
produces up to 30% more bandwidth than DVB-S2, for a total
improvement of up to 60% over DVB-S.
•
Most efficient TDMA return channel
– Because HX
System TDMA return channels use
Aloha
for initial
assignment request, operators can optionally utilize the
bandwidth of satellite routers that are idle for some period of
time while maintaining the QoS commitment to a customer.
The HX System TDMA inbound channel also uses variable
length bursts, allowing up to 85% efficiency on the return
channel.
•
Robust rain fade mitigation techniques
– Recognizing that
high availability is a crucial element of enterprise SLAs, the
HX System provides the industry's most extensive set of
features for increasing overall system availability. These
features include dynamic ACM on the DVB-S2 outbound
carrier, dynamic coding of the TDMA return channel, and
dynamic uplink power control for the satellite router.
•
Advanced IP features
– HX satellite routers support a
number of built-in router functions, which are configured
remotely at the HX System gateway. These functions
Summary of Contents for HX System
Page 1: ...1037852 0001 Revision A September 4 2008 HX System System Overview Release 1 2 7 ...
Page 8: ... Contents viii 1037852 0001 Revision A ...
Page 10: ... Figures x 1037852 0001 Revision A ...
Page 12: ... Tables xii 1037852 0001 Revision A ...
Page 24: ...Chapter 1 Overview 12 1037852 0001 Revision A ...
Page 26: ...Chapter 2 Subsystems 14 1037852 0001 Revision A Figure 3 HX Subsystems and LAN Connections ...
Page 50: ...Chapter 4 Network security 38 1037852 0001 Revision A ...
Page 62: ...Chapter 5 Bandwidth management 50 1037852 0001 Revision A ...
Page 70: ...Chapter 6 IP features 58 1037852 0001 Revision A ...
Page 80: ...Chapter 8 Transmission features 68 1037852 0001 Revision A ...
Page 88: ...Chapter 10 HX options 76 1037852 0001 Revision A ...
Page 96: ...Appendix B Transportable Gateway TGW 84 1037852 0001 Revision A ...
Page 100: ... Acronyms and abbreviations 88 1037852 0001 Revision A ...
Page 106: ... Index 94 1037852 0001 Revision A ...