-
it reads the priority associated to the message
-
it reads the life time of the message
-
it selects the first required sub-network as given in the routing policy
-
it checks the availability of this sub-network. If it is unavailable, it checks the availability of the next sub-network given in the routing policy. When no other sub-network is given in the routing policy, the message is buffered until one sub-network becomes available.
NOTE : The router is able to buffer up to 32 messages for hosted
____ AOC applications and 2 messages for each remote AOC application.
(b) Downlink labels generated by the ATSU router Downlink messages are routed with one of the following downlink labels:
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Label MEANING
5P Temporary suspension
_DEL General response
HX Undelivered message
Q0 Link test
Q5 Unable to deliver message
Q6 Voice to data change
advisory
QX Intercept/unable to process
SA Media change advisory
F3 Generated in response
to label 54 uplink
For remote AOC application, the following labels are defined:
H1/M1 FMGC1
H1/M2 FMGC2
H1/CF CFDIU
H1/DF DMU (ACMS)
H1/T1 Cabin Terminal 1
H1/T2 Cabin Terminal 2
H1/S1 SDU1
H1/H1 HFDR1
H1/H2 HFDR2
(c) Downlink message priority
The ATSU router sends the downlink messages according to their order of priority. The following table gives the level of priority depending on the
message source:
1 Protocolar messages
(5P, F3, Q5, QX, _DEL)
2 Link establishment messages
(Q0)
3 Message media advisory
(SA)
4 ATC communication
(provision)
5 Essential ACARS message
(Q6, HX)
6 Router manager messages
Remote AOC messages (FMGC)
7 Hosted AOC messages
Remote AOC messages
(CFDIU, SDU1, HFDR1, HFDR2)
8 Remote AOC messages
(DMU)
9 Remote APC messages
(Cabin Terminals)
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(d) Routing policies A routing policy lists a set of allowed media, with a preference order and the conditions which lead to a change of medium.
1_ The hosted AOC application has defined the following routing
policy codes:
- "V" code for VHF media only
- "S" code for Satcom media only
- "H" code for HFDR media only
- "G" code for VHF, then HFDR, then Satcom media depending on
their availability.
2_ The remote AOC application has defined the following routing
policy codes:
- "V" code for VHF, then HFDR, then Satcom media depending on
their availability
- "S" code for Satcom, then HFDR, then VHF media depending on
their availability
- "H" code for HFDR, then Satcom, then VHF media depending on
their availability
- "G" code for VHF, then HFDR, then Satcom depending on their
availability.
C. Air/Ground Datalink Communication Indicating The ATSU uses the services provided by the FWCs to activate visual/aural alerts and alarms in case of:
-AOC message reception
-failure or unavailability of datalink functions.
The FWCs are used to generate these warning indications according to the information provided by the ATSU. The conditions of activation/deactivation of these warning indications are managed by the ATSU, while the FWCs are in charge of display, priority and inhibition management.
A pin-programming is activated on the FWC following airline request to generate:
-ACARS warnings when the "ACARS installed" hard pin-programming is activated
-ATSU warnings when the "ATSU installed" hard pin-programming is activated
(1) ECAM warnings related to AOC application When an uplink message is received on-board for the ATSU hosted AOC application, the following alerts are generated.
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