L3 Technologies AFIRS228S ユーザーズマニュアル
AFIRS 228S Iridium Global Communications System Installation Manual
16 July 2014
L-3 Aviation Recorders Proprietary
Page 44
165E5733-00 Rev. 03
6.6 CFDIU Interface
The SDU communicates with the Centralized Fault Display Interface Unit (CFDIU) over two ARINC
429 Low Speed busses, (1) input and (1) output as shown in Figure 6-4.
429 Low Speed busses, (1) input and (1) output as shown in Figure 6-4.
Figure 6-4 – CFDIU Interface
6.7 Date, Time, and Position
The Iridium SATCOM System’s internal GPS provides date, time, and position information to be used
in various ways; for example, attaching information tags to various reports and events.
in various ways; for example, attaching information tags to various reports and events.
6.8 Rear Ethernet Ports
The Iridium SATCOM System has four rear Ethernet ports (see Figure 6-5) that should be set to
“none”. Each port can auto-negotiate the best speed (10/100) and mode (full/half duplex).
“none”. Each port can auto-negotiate the best speed (10/100) and mode (full/half duplex).
A 4-conductor Ethernet cable must be used. The rear connector pin layout provides slightly better
noise immunity with a star-quad cable construction, but a twisted-pair cable construction can generally
also be used.
noise immunity with a star-quad cable construction, but a twisted-pair cable construction can generally
also be used.
•
For star-quad cables, the conductor lay order should be maintained without crossing the
conductors when terminating.
Examples: PIC P/N E51424 and ECS P/N 422404
conductors when terminating.
Examples: PIC P/N E51424 and ECS P/N 422404
•
For twisted-pair construction, the conductor twists should be maintained right up to the rear
connector.
Examples: PIC P/N E40424 and ECS P/N 922404
connector.
Examples: PIC P/N E40424 and ECS P/N 922404
In either case, the best noise immunity is obtained by keeping the strip length of the shield as short as
physically possible, preferably <0.25 inches.
physically possible, preferably <0.25 inches.
Each of the Ethernet ports can be configured in software for the proper protocol of the external aircraft
system to which it is interfaced. Below is a list of the available protocols.
system to which it is interfaced. Below is a list of the available protocols.
•
None
•
Not Monitored
•
Monitored
Unused Ethernet ports should be configured as “None.” A “Monitored” port is one where the system
expects an active link and it will generate a fault if the Ethernet link to the external system is not
expects an active link and it will generate a fault if the Ethernet link to the external system is not
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