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This manual provides all the specifications, principles of operation, and information necessary 
to install an HSD High-Speed-Data SATCOM Transceiver made by EMS Technologies in all 
supported operational modes and configurations. 

The information needed to install HSD-X High-Speed-Data SATCOM Transceiver Extensions 
in Multi-Channel configurations with Stand-Alone HSD-128 units is also provided in this 
document. 

The information provided is presented in the following sections: "System Description" on page 
1-1, "System Operation" on page 2-1, "Installation" on page 3-1, "Test and Fault Isolation" on 
page 4-1, and "Maintenance and Repair" on page 5-1. The Appendices provide additional 
reference information. An Illustrated Parts List is not included with this manual.

Only qualified avionics personnel, knowledgeable in the technical and safety issues related 
to the installation of aircraft communications equipment, should perform the installation 
procedures provided in this manual. 

This manual includes general installation guidelines only; it is not intended to provide specific 
procedures for every type of installation. 

If necessary, the information in this manual may be revised. Before attempting the installation 
procedures presented in this manual, verify that you have a complete and up-to-date release 
of this document.

Depending on the version of software and configuration mode of installation of the HSD 
transceiver, the “actual” or “live” system messages such as dialog boxes and screen displays, 
may differ slightly from the example illustrations presented and described in this manual.