User's Manual

Page 1–22
18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
The 24-bit Fwd ID strap pins, available on the ARINC 600 connector, form part
of the Inmarsat serial number (ISN). The ISN consists of the type approval
number and the Fwd ID address. Each FRLP is associated with Inmarsat Mobile
Numbers (IMN), which are the numbers that a user dials from the ground to reach
the terminal on an aircraft. There is a unique IMN for each of the service types
(e.g. data, voice, Fax).
(c) HSD WOW Pin Wiring
Weight-On-Wheel (WOW) discretes indicate when an aircraft is on the ground
and are used for flight data-logging purposes. Note 40 of ARINC 741 defines the
WOW pins.
(d) HSD IRS ARINC 429 Interface
Table 1–18 shows the IRS ARINC 429 bus labels and associated data types. For
more details on characteristics, refer to Appendix 10 of the ARINC 704-7, Inertial
Reference System document.
1. Stand-Alone Mode and Multi-Channel Configuration
In Stand-Alone Mode installations, the HSD requires high-speed ARINC 429,
IRS Navigational information (as shown in
17) to compute the azimuth,
elevation, and Doppler correction information required for antenna pointing.
2. Non-Stand-Alone Modes
In Combined and Selective Mode installations, the HSD uses aircraft IRS
information to determine which satellite to use, as selected by the Aero H/H+
SDU.
In Cooperative Mode installations, the HSD uses aircraft IRS information
received from the ARINC 741 SATCOM SDU via the SDU crosstalk ARINC
429 bus.
Table 1–18. ARINC 429 IRS Navigational Requirements
Label (octal) Name
Interval Rate (ms)
Min. Max.
310 Latitude 100 200
311 Longitude 100 200
312 Ground Speed 25 50
313 True Track 25 50
314 True Heading 25 50
324 Pitch Angle 10 20
325 Roll Angle 10 20