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18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
SYSTEM DESCRIPTION
1.
Purpose of Equipment
The HSD is a scalable, high-speed-data, satellite communications terminal, which interfaces 
with an ARINC 741-compatible antenna subsystem to provide a high-speed data 
communication link with the Inmarsat satellite communication network. HSD transceivers are 
available in single and dual channel models which can be installed in the following modes of 
operation: Stand-Alone Mode, Combined/Selective Mode, and Cooperative Mode.
In Stand-Alone Mode HSD installations, the addition of HSD-X extension transceivers expands 
the channel capacity by providing one additional voice or 64 kbps data channel—per HSD-X 
to provide a Multi-Channel, high-speed data communication link with the Inmarsat satellite 
communication network.
Table 1–1 shows the services that are supported by each HSD terminal.
 Table 1–1. Supported Services Matrix for HSD-128, HSD-64, and HSD-X
Supported Services 
and Functionality
HSD-128 
(Stand-Alone, 
Multi-Channel)
HSD-64/HSD-128 
(Combined/Selective, 
Cooperative)
HSD-X 
(Multi-Channel 
HSD)
Inmarsat Swift64 ISDN 
 
(64 kbps UDI, 64 kbps 
Speech, 56 kbps Data, 
and 3.1 kHz audio)
YES
YES
YES 
MPDS
Over 
RS-232
YES (with service 
bulletin 
1110-SB-0006) 
YES (with service 
bulletin 1110-SB-0006)
YES
Over 
Ethernet
YES 
 
(PNs 1110-A-0150, 
1110-A-0160, and 
HSD transceivers 
with service bulletin 
1110-SB-0006, 
1110-SB-0004)
YES
 
(PNs 1110-A-0150, 
1110-A-0160, and HSD 
transceivers with 
service bulletin 
1110-SB-0006, 
1110-SB-0004) 
YES
AMBE® Mini-M Voice 
(4.8 kbps)
YES
NO
YES
STU III (Encryption)
YES (Full ISDN)
YES (Full ISDN)
YES (Full ISDN)
AMBE® STU
YES (with channel 
card software 
version 6.0 (C41) or 
later)
NO (Selective – YES)
YES (with channel 
card software 
version 6.0 (C41) or 
later)