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The graphic shows how the remote terminal or VSAT fits into the HughesNet system architecture. Let's start by clearly defining what is meant by VSAT:

VSAT -- Per ( VSAT is Short for Very Small Aperture Terminal. A VSAT is an earthbound station used in satellite communications for data, voice and video signals, excluding broadcast television. A VSAT consists of two major parts, as follows:

A transceiver - This is placed outdoors in direct line of sight to the satellite. It is part of the Feed Arm attached to the dish.

A device that is placed indoors, to interface the transceiver with the end user's device. This is your HughesNet satellite modem.

The transceiver receives and sends signals, to a satellite transponder in the sky. The satellite transponder receives and sends signals, to a ground station computer located at the HughesNet NOC (Network Operations Center).

Each end user is interconnected with another computer at the NOC, via the satellite, forming a star topology. It is also called the Hub and Spokes topology. The computer at the NOC (the Hub ) controls the entire operation, for its portion of the network. For one end user to communicate with another, the transmission has to first go to the Hub, which then retransmits it (via the satellite) to the other end user's VSAT.

Pointing the Antenna :

The antenna uses a three axis pointing system, which you will adjust, after you move:

Azimuth - This is the magnetic compass direction (angle of sighting) at which you point the dish. It is a side-to-side adjustment.

Elevation. - This is the angle above the horizon, at which you point the dish. This is an up-and-down adjustment.

Polarization - The polarization or skew is set after each move. This is a rotational adjustment

HughesNet System Components

The figure above illustrates the four major components of a HughesNet VSAT system:

The Outdoor Unit (ODU) - This comprises the antenna and the feed arm, which has the receiver and transmitter.

The Indoor Unit (IDU) - This is the HughesNet Model DW6000, DW7000, or HN7000S satellite modem.

The Interfacility Link (IFL) Cables - The cables connect the IDU to the ODU.

The Software - This is contained in the firmware of the satellite modem

Satellite Mobility Support Network (SMSN) HughesNet User Guide

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