| Name | Data Type | Definition | |
|---|---|---|---|
| nilReason | NilReasonEnumeration | ||
| UPLINK | string | Channel carries Ground-to-air traffic only. | Inherited from CodeCommunicationDirectionBaseType |
| DOWNLINK | string | Channel carries Air-to-Ground traffic only. | Inherited from CodeCommunicationDirectionBaseType |
| BIDIRECTIONAL | string | Channel carries traffic both ways. | Inherited from CodeCommunicationDirectionBaseType |
| UPCAST | string | Broadcast from ground to aircraft. | Inherited from CodeCommunicationDirectionBaseType |
| DOWNCAST | string | Broadcast from aircraft. | Inherited from CodeCommunicationDirectionBaseType |
| OTHER | string | Other. | Inherited from CodeCommunicationDirectionBaseType |