EMS Technologies Canada Ltd. HSD-400 Manuale Utente

The HSD-400 terminal is a scalable, high-speed data, satellite communications terminal. It 
interfaces with an ARINC 741 compatible antenna subsystem to provide a high-speed data 
communication link with the Inmarsat satellite network.

This section includes basic information about the HSD-400 terminal, including the following 
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The HSD-400 terminal is a scalable, high-speed data, satellite communications terminal that 
interfaces with ARINC 741 and ARINC 781-compatible antenna subsystems to communicate 
with the space segment of the Inmarsat Satellite Network via L-band RF signals.

HSD-400 terminals support the following services:

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Inmarsat Integrated Services Digital Network (ISDN) Single Channel Per Carrier (SCPC) 

Service

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Inmarsat Serial Mobile Packet Data Services (MPDS)

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AMBE® Voice Technology

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SwiftBroadband (SBB) Service

The HSD-400 terminal contains two channel cards, a high stability reference oscillator, a high 
power amplifier, a data processor module, and a power supply. The HSD-400 terminal receives 
power from the aircraft as either 28 V dc or 115 V ac, 400 Hz.

The HSD-400 terminal supports two channels of Inmarsat Swift64 MPDS or four channels of 
Mobile ISDN 64 kbps data links. The HSD-400 terminal supports one SBB channel on each 
channel card, for a total of two SBB channels—the limit of SBB channels available to any 
aircraft set by Inmarsat.