Glossary - Hughes 9350 User Manual

G
LOSSARY
APN: An Access Point Name (APN) provides access to an external network. By default, the SIM
Card in your terminal is configured with the APN of your Service Provider. You may want to
configure further APN's if you have arranged with your Service Provider to use more than one
SIM Card.
BGAN Satellite Terminal: Referenced throughout this document as the Satellite Terminal, "The
Terminal," or UT. This device implements and manages BGAN satellite communications
between your computer and Service Provider's network.
Quality of Service: Quality of Service (QoS) assigns a level of priority to certain types of data
traffic, in particular high bandwidth applications such as video and multimedia. QoS
attempts to maintain a guaranteed throughput level, and minimize error rates and end to
end latency, so providing a higher level of service than "best effort" protocols.
DNS Server: The Domain Name System (DNS) is an Internet service that is required because the
Internet does not recognize the text-based Web address or email address that you type into
your Web browser or email application. All or part of a Web address or an email address is a
domain name, and DNS translates this domain name into an IP address that is recognized by
the Internet.
A DNS Server holds a database of domain names and IP addresses, so that when you enter
a Web address or email address, you are directed to the correct IP address over the Internet.
Dynamic DNS Server: If you are using dynamic IP addressing, Inmarsat recommends that you
use a dynamic DNS server. A dynamic DNS server updates the IP address information in
the DNS database each time your IP address changes. A dynamic DNS server also
enables a computer using a dynamic IP address to use network applications that
normally require a static IP address, for example FTP servers. This service requires
subscription with a Dynamic DNS provider.
Static DNS Server: If you are using static IP addressing, Inmarsat recommends that you use a
static DNS server. If you select this option, you must enter the IP address of the Primary
DNS Server. This is supplied by your Internet Service Provider. Optionally, you can enter
the IP address of a Secondary DNS Server, also supplied by your ISP. This is used in the
event of failure of the Primary DNS Server.
Error correction: Error correction ensures that very little data is lost during transfer by asking for
dropped packets to be resent. However, because it holds subsequent data whilst the
packet is being resent, you may notice some jitter or delay in the received data. This is
normal for most data types.
For real-time applications, such as Voice over IP (VoIP) or video, it is recommended that you
remove error correction. Removing error correction minimizes delay and jitter..
Ethernet: Ethernet is a local area networking method used widely throughout the computer
industry. It is one of the three communications interfaces supported by the Satellite Terminal.
Fault Code: A number which uniquely references an error in a hardware or software system. In
the Satellite Terminal, if there is a fault detected, the fault code and a description are
displayed in suitable LaunchPad windows.
GPS: Global Positioning System. The GPS receiver in the Satellite Terminal receives signals from
the constellation of GPS satellites. It uses these signals to determine the Terminal's location on
earth. That location is used during registration to gain access to the BGAN system.
Header Compression: A header is the component of a data packet that precedes the data that
you are sending. The header contains information such as source and destination address,
error checking and other administrative details. In most data types this does not noticeably
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Hughes 9350 BGAN Terminal User Guide