User's Guide

DRAFT
Page 1-8
17 Mar 2016
23-15-87
© Honeywell International Inc. Do not copy without express permission of Honeywell.
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ARINC 781-500 SDU and SCM
• Control and data processor card
• Voice processor card
• High power amplifier
• ARINC backplane
• DIN backplane
• 10 MHz oven controlled crystal oscillator
• Power supply.
The major interfaces of the SDU are listed in Table 1-4.
B. SCM
The SCM does not provide any interfaces other than a dedicated interface to the SDU.
The SCM is powered by the SDU.
5. User Interfaces
This section describes the A781-500 SDU interfaces that enable users to access Inmarsat services and
monitor the operation of the A781-500 system.
NOTE:
There are no user interfaces associated with the SCM.
Table 1-4. SDU System Interfaces
System Interface Description
ACU/BSU (x1) Antenna control unit/beam steering unit
TCP (x3) Tuning and control panel. Interconnected to the SDU
multi-purpose control and display port
ACARS CMU (x2) Aircraft communication addressing and reporting system
communication management unit
IRS (x2)/GPS (x1) Inertial reference system/global positioning system
SCM (x1) SDU
configuration module
AES ID (x1) Aircraft Earth station identification
Servicing DE-9 front panel
Button Test Button front panel
RF Transmit/receive to the DLNA
Antenna subsystem ARINC 781 antenna subsystem
Miscellaneous ARINC discrete input, outputs, and configuration straps
DRAFT as of
4 Mar 2016