Users Manual

ALL
EFFECTIVITY
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Page 5-28
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
(c) For each valid satellite link, attempts Network Logon until Network Logon is
achieved.
(8) When all the following occurs:
(a) Automatic satellite selection is active.
(b) In Dual SATCOM mode.
(c) "SATCOM Select Mode" is Auto.
(d) SDU is Active SDU.
(9) The ACD:
(a) Loops through valid and available satellite links in order of preference once each;
(b) For each valid satellite link, attempts Network Logon.
(c) If after going through entire satellite links, the Network Logon cannot be
achieved:
1 De-asserts the SDU DSS.
NOTE: This will allow the Standby SDU to go to Active if it believes it
can provide service, but in 20 minutes if still in coverage the
preferred satellite will attempt again.
(10) The ACD holds non-safety channels (e.g. channel B of the DABC) from registering and
attaching until Safety Logon is achieved.
(11) When Network Logon has been achieved, the ACD attempts a Safety Logon.
(12) When automatic satellite selection is active and the attempt to the Safety Logon fails, the
ACD blacklists the satellite link (temporary or permanent based on cause code) and
looks for the next available valid satellite link.
(13) When the ACD is safety logged on to the GDGW, the ACD sets bit 17 of the CMU Status
Label 270 to:
(a) 0 (SATCOM logged on)
ELSE
(b) 1 (SATCOM not logged on).
(14) When a logoff is received from the pilot selection, the ACD logs-off the current satellite.
C. Satellite Handover
(1) The SDU can handover to a different satellite if a preferred satellite is available and when
configured to Dual Safety SATCOM mode, it can also handover to a companion SDU if it
cannot provide safety services. Refer to the Dual Safety SATCOM section for more
information on handing over to a companion SDU.
(2) The SDU maintains logged on status to the GDGW while doing a handover to another
satellite.
NOTE: It is expected that the PDP Context will remain active while doing the
handover.
(3) If the SDU has Network Logged on using automatic satellite selection, the SDU enables
automatic satellite handover.
(4) If the SDU has Network Logged on using constrained satellite selection, the SDU
disables automatic satellite handover.
DRAFT
3rd rvw Draft as of:
29 January, 2020