The unit an application sends, and the protocols that move files and bundles across a network of them.
| Protocol | Standard | Package | |
|---|---|---|---|
| Space Packet Protocol | CCSDS 133.0-B-2 | pkg/spp | Conformance |
| Encapsulation Packet Protocol | CCSDS 133.1-B-3 | pkg/epp | Conformance |
| CCSDS File Delivery Protocol | CCSDS 727.0-B-5 | pkg/cfdp | Conformance |
| Licklider Transmission Protocol | CCSDS 734.1-B-1 | pkg/ltp | Conformance |
| Bundle Protocol | CCSDS 734.2-B-1 | pkg/bp | Conformance |