General description
2-6 Chapter 2: Introduction 98-145168-A
SDU Configuration Module (SCM)
The SCM contains non-volatile memory for storing the Secure Owner Requirement Table
(ORT) and the User ORT, which hold the system settings. The SCM contains a write-
protected area for storing installation data (system configuration, RF cable losses, antenna
system etc.) that are only updated during installation, and a user non-write-protected area
for storing a phone book and the customer-specific configuration parameters.
The SCM is an external module for the CSDU, making it easier to replace the CSDU while
retaining all system and user settings in the SCM. If the CSDU must be replaced, the SCM
remains installed in the aircraft. When the replacement CSDU is installed and connected to
the SCM the system then user settings are available again.
The SCM contains four Inmarsat BGAN USIM cards and one security SmartCard. In the
AVIATOR 200S System system, one USIM card is used to access the Inmarsat
SwiftBroadband services and the remaining three USIM cards are reserved for future use.
The Security SmartCard contains integrity/ciphering keys and authentication algorithms
and is used by the Aircraft ACARS Gateway (AAGW). The SCM is delivered with all five cards
installed and these cannot be replaced in the field.
HLD/Enhanced Low Gain Antenna (HELGA)
The CSDU interfaces directly to a HELGA antenna (Class 4 Enhanced Low Gain Antenna
with a built-in Diplexer Low Noise Amplifier (DLNA) and High Power Amplifier (HPA). The
HELGA complies with ARINC 781-7, Attachment 7 [3] ELGA (Enhanced Low Gain Antenna)
mounting footprint. It uses a phased array antenna with no moving parts. Together with the
CSDU it forms a Class 4 system. The LGA-5005 HELGA is compliant with ARINC 781 and
has the following internal SATCOM interfaces:
• 1x Coaxial RF interface (for Rx/Tx signals, power, control and BITE) to the CSDU
The antenna is steered by the CSDU, which derives steering information from aircraft
navigational data.
For more information see the HELGA installation manual [8].
Operation with an SCDU and headset
You can operate the AVIATOR 200S system via the following user interfaces:
• Headset and SCDU connected to the CSDU to make and answer calls
• SCDU to display system messages (Information and BITE codes)
• Headset connected to the audio control panel to make and answer calls
Up to 3 SCDUs can be connected. System status and BITE messages of the AVIATOR 200S
system can be displayed in the SCDU display.
Other user interfaces
The AVIATOR 200S system has a dedicated AISD Ethernet interface for EFB or other
cockpit application requiring IP data communication services.
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General