User Manual

AFIRS 228S Iridium Global Communications System Installation Manual
16 July 2014 L-3 Aviation Recorders Proprietary Page 29
165E5733-00 Rev. 03
3.9 ARINC 429 Receiver Activity Status
Defines the criteria the Iridium SATCOM System uses to determine if a receiver port is active. A bus is
generally declared active when four consecutive words at the specified rate are received, and
declared inactive when four consecutive samples fail.
Table 3-6 – ARINC 429 Receiver Port Monitoring
Receiver
Activity Label
Min
imum
Update Rate
ATSU / FWC 270 1 Hz
ARINC 739A MCDU 270 / 377 1 Hz
3.10 ARINC 429 Transmitter Protocols
3.10.1 From SDU to ATSU / FWC
Table 3-7 – ARINC 429 Transmitter Protocols SDU – ATSU/FWC
Destination: ATSU / FWC Speed:
High
(Configurable)
Label Parameter Format Transmit
Rate
Update Rate
172 SDU Identifier BCD 1 s –
270
SDU Status Word and
Monitoring
Boolean
word
1 s -
304 ATSU SAL HYB
ARINC 618
Block Uplink
BOP (GFI=Eh) ISO 5 N/A -
ARINC 618
Block Downlink
BOP (GFI=Eh) ISO 5 N/A -