User's Manual

UL-801 Installation Manual
Page 26
23-20-06 15 December 2011
O. SatCom-based ARINC 741 (SAT)
UniLink interfaces with an ARINC 741-capable SatCom system, such as the
Universal/Thrane & Thrane Aero-I SDU and others, via a low speed ARINC 429 interface.
Packet Mode ACARS data (Data 2) is sent to the SDU for forwarding to the ACARS
gateway on the ground through the Ground Earth Station (GES) and vice versa.
NOTE: The UASC Aero-I SatCom system is not approved for FANS messaging.
The UniLink SAT Communication Status is displayed on the COMM STATUS page and is
explained in the following table.
SatCom Media Status Reason
COMM/IDLE
SatCom (SAT) communication has been established and datalink messages
can be transmitted over SatCom. No data is currently being transmitted.
COMM/SENDING
A message is currently in the process of being transmitted. UniLink is
waiting for acknowledgement from the ground.
NOCOMM/SDU UNAVAIL
NOTE: SDU is the Satellite
Data Unit.
The SatCom’s system SDU is reporting that it is unavailable.
NOCOMM/SDU INOP UniLink does not detect the SDU.
NOCOMM/AUTO DELAY UniLink is waiting before trying to establish a SatCom (SAT) link again.
NOCOMM/TIMEOUT
Retries have been exhausted, and Auto Return to Comm configuration
setting is disabled. A manual Link Test must be performed, or an uplink
received for the medium to return to COMM.
NOCOMM/CONNECTING A SatCom (SAT) link is in the process of being established.
NOCOMM/SUSPENDED SatCom (SAT) link has been suspended by the crew.
COMM/IDLE
SatCom (SAT) communication has been established and datalink messages
can be transmitted over SatCom. No data is currently being transmitted.
COMM/SENDING
A message is currently in the process of being transmitted. UniLink is
waiting for acknowledgement from the ground.
NOCOMM/SDU UNAVAIL
NOTE: SDU is the Satellite
Data Unit.
The SatCom’s system SDU is reporting that it is unavailable.
NOCOMM/SDU INOP UniLink does not detect the SDU.
NOCOMM/AUTO DELAY UniLink is waiting before trying to establish a SatCom (SAT) link again.
NOCOMM/TIMEOUT
Retries have been exhausted, and Auto Return to Comm configuration
setting is disabled. A manual Link Test must be performed, or an uplink
received for the medium to return to COMM.
NOCOMM/CONNECTING A SatCom (SAT) link is in the process of being established.
NOCOMM/SUSPENDED SatCom (SAT) link has been suspended by the crew.