| 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 |