Chapter 1 • Overview
1037852-0001 Revision A
9
cost-efficient solution to support the rapid deployment of smaller
satellite networks in difficult operating conditions.
A TGW overview with a description, list of features, services
supported, advantages and technical specifications is included in
Appendix B.
HX satellite routers HX satellite routers reside at the end user location and
communicate with the HX gateway via satellite link.
Network segments
The HX network is divided into segments, each of which
represents a portion of the communications link. These segments
include:
• Gateway segment
• Satellite router segment
• Space segment
• Wide area network segment
Gateway segment The gateway is the centralized earth station through which the
entire network is controlled. The gateway is normally located at
the customer's Network Operations Center (NOC). It contains
transmit and receive communications equipment, a radio
frequency terminal (RFT) consisting of RF equipment and a large
antenna, and network management subsystems and infrastructure.
The gateway segment manages the entire HX System and any
backend systems used for handling tasks such as billing, customer
care, and provisioning. See
Chapter 2 – Subsystems for more
information.
Satellite router segment Satellite routers provide broadband TCP/IP communications to
remote sites. The satellite router segment is the network segment
located at the end-user modems. Each satellite router has an
indoor unit (IDU), which contains the receive and transmit units;
and an outdoor unit (ODU), which consists of RF equipment and
an antenna.
A remote local area network (LAN) host is a device at the remote
site that communicates across the HX System via TCP/IP.
See Chapter 9 – Satellite routers, on page 69 for more
information.
Space segment The space segment is the satellite portion of the link, and
connects all of the satellite routers in the network to the gateway.
Wide area network segment The wide area network (WAN) segment includes the Internet and
various private independent IP networks with which HX satellite