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