Are you talking about a SATCOM datalink? If so then you normally just get messages like "Datalink lost" or "No SATCOM" as that is all the pilots need to know. Specific reasons for SATCOM data failure are only normally gleaned by looking at the MAT [Maintenance Access Terminal] which is located on the rear right-hand side of the flight deck [behind where the co-pilot sits] This is the access point that a ground engineer uses to look for any fault history, existing faults, present leg faults or carry out system tests, to see if a fault is present of has been cleared after maintenance. It runs on Windows XP
