User's Manual

Page 1–44
18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
C. Functional System Theory
The HSD is a high-speed SATCOM Transceiver that contains: either one or two channel
cards, a high stability reference oscillator, a high power amplifier, a data processor module,
and a power supply. The HSD receives power from the aircraft as either 28 V dc or 115
V ac, 400 Hz.
When integrated with the SAT-906 Aero H/H+ as a Cooperative Mode system (refer to
Figure 1–12), the HSD L-band Rx/Tx interfaces are shared with those of the SAT-906 via
combiners/splitters between the DLNA and the HPA. The SDU of the SAT-906 maintains
control over the HSD component via the crosstalk bus and associated discretes.
HSD transceivers installed in Combined Mode configurations operate with the Honeywell
Aero H/H+ MCS 3000/6000 and MCS 4000/7000 Multi-Channel Satellite Communication
Systems. The HSD hardware is installed in the SATCOM HPA equipment position,
replacing the existing HPA. An external splitter “splits” the antenna receive (Rx) path to
send the RF signal to the HSD and the Aero H/H+ systems. The antenna is controlled by
the Aero H/H+ system’s SDU.
The HSD supports one or more channels (depending on the model, mode, and
configuration installed) of Inmarsat Swift64 MPDS and Mobile ISDN 64 kbps data links.
The HSD and HSD-X both have three different ports that support the following interfaces:
EURO ISDN S/T, serial (RS-232), and Ethernet (10BASE-T). Although able to support
multiple configurations depending on user needs, the following constraints apply:
• EURO ISDN S/T port supports Swift64 Mobile ISDN (circuit-switched
services - SCPC) only
• RS-232 port supports MPDS only
• 10BASE-T port supports Swift64 Mobile ISDN or MPDS (Available on HSD
transceivers PN 1110-A-0150 and 1110-A-0160 or HSD transceivers that have
accomplished Service Bulletin, 1110-SB-0004 to upgrade to a Data I/O Type 2 Card)
Note: Only one service type can be used at one time—per HSD or HSD-X transceiver
channel card.
The most likely configurations (as illustrated in Figure 1–14) include connecting a
networking device such as a router or a file server to allow multiple users to share the
channel(s) provided by the HSD.
The simplest configurations, using the RS-232 interface, allow users to connect directly
to the HSD without any kind of networking device (e.g. router or server). The RS-232 port
allows a single user for MPDS only, while the ISDN S/T port will allow up to eight users
on a first come first serve basis.