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standard message identifier and the MA TEI indicating Success (e.g. MA 123S, where MA is the TEI, 123
the serial number of the corresponding uplink, and S indicating success.) The indication for an uplink that
was not successfully delivered is an “F” (e.g. MA 123F.) The ground/ground message “DT” line of the
message will indicate the CSP and ground station over which the technical acknowledgment of the
message was received for the message along with the time the technical acknowledgment was accepted,
or, in the case of a multi block message, the final block.
5.5 “DT” Line
The DT line is included in both the MAS messages just described and the ground-ground message
representation of an air-ground downlink message. In the downlink case, the DT line provides the CSP
and ground station that received the message, or, in the case of a multi-block message, the first block of
the air-ground downlink message, as well as the time of receipt and message sequence number. The
CSP codes can be found in ARINC 620. A CSP may have a separate code for each media they support.
21
FANS-1/A Datalink Communications Environment
Appendix A - Planned System Element Upgrades and/or Significant Changes and
Associated Status
A.1 GES Upgrades
A.1.1 SITA
SITA provides Satellite AIRCOM service based on the Inmarsat Classic Aeronautical service via a
Ground Earth Station (GES) at Aussaguel (operated by Vizada) and a GES at Perth (operated by
Stratos/Xantic) which were deployed in 1990. SITA has been in the process of implementing upgrades to
both GESs to remove obsolete components. The first upgrade undertaken in late 2005 to replace the
obsolete data switch called EBPACK has been completed. The second upgrade to replace the radio
communications channel units was completed in two steps. The first step was for the channel units
supporting data services which has now been completed at both the Aussaguel and Perth GESs. The
second step was for the channel units supporting voice services which has now been completed at both
the Aussaguel and Perth GESs.. The following is the GES Upgrade timeline and status:
2004: SITA worked with the GES manufacturer Nera to define TAD Upgrade/EBPACK
replacement.
2005 Feb: Inmarsat contracted with Nera to develop a new generation of channel units.
2005 Aug: France Telecom contracted with Nera for the channel units needed in Aussaguel.
2005 Oct: Aussaguel GES TAD Upgrade/EBPACK Replacement completed.
2005 Nov: Perth GES TAD Upgrade/EBPACK Replacement completed.
2006 Jun 29: Aussaguel Data Channel Unit Upgrade completed.
2006 Aug: Old channel units freed up as a result of the Aussaguel Upgrade installation at Perth
completed. This resultedresulted in increased capacity and providedprovided additional
spares until completion of Perth upgrade.
2006 Oct 5: Perth GES Data Channel Unit Upgrade completed.
2006 Dec 14: Perth GES TAD release to correct issues identified after data channel unit upgrade.2007
Mar 28: Aussaguel Voice Channel Unit Upgrade completed.
2007 Apr 18: Perth Voice Channel Unit Upgrade completed.
A brief description of the two upgrades follows.
A.1.1.2 Upgrade 1: Datalink Service Upgrade (Now completed at both the Aussaguel and Perth GESs)
In 2004, SITA contracted with the GES manufacturer (Nera) to develop a TAD (GES main computer)
upgrade to improve its reliability and enable the replacement of the EBPACK (GES dataswitch/interface
to terrestrial network). The TAD Upgrade included additional computer memory that enables an increase
in the maximum number of Virtual Circuits from 1024 to 4096. Including the cost of installing the upgrade
in the GES the total investment was in the order of $1 million. SITA replaced the EBPACK with a modern
switch already used in SITA centers that provides high reliability and a better interface to SITA network
management systems.
A.1.1.3 Upgrade 2: Inmarsat Classic Aero Channel Unit Replacement
In late 2004, Inmarsat organized a series of meetings with participants in classic aeronautical service
provision to agree an approach to avoiding GES component obsolescence that could result in forcing the
service to be shut down. It was agreed that the radio channel units were the most critical GES
FANS-1/A Datalink Communications Environment
component facing obsolescence and that to ensure fair competition all GES would need to be equipped
with new generation channel units to keep providing the service. SITA agreed at that time with France
Telecom and Xantic to contribute to the funding of the installation of the new channel units in their GES.
In February 2005, Inmarsat contracted (for USD3.8 Million) with Nera to develop a new generation of
channel units. SITA contributedcontributed funding of approximately USD4 million in total to the
　
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