| Abbreviation | Definition |
|---|---|
| OAS | Oracle Application Server |
| OASIS | Open Architecture for Scaleable Internet Systems |
| OASIS | Open Architecture System Integration Strategy |
| OBEX | Object Exchange |
| OBN | Open Broadcast Network |
| OBNM | Out-of- Band Network Management |
| OBSN | Optical Burst Switching Network |
| OC | Optical Carrier |
| OC | Optical Connection |
| OC-1 | Optical Carrier 1, 51.840Mbits/Second |
| OC-12 | 622.080Mbits/sec |
| OC-3 | 155.520Mbits/sec |
| OC-48 | Optical Carrier 48, 2488.320 Mbits/ Second |
| OCCI | Open Cloud Computing Interface |
| OCE | Open Collaborative Environment |
| OCF | Open Cluster Framework |
| OCI | Open Communication Interface |
| OCN | Open Computer Network |
| OCN | Optic Connectivity Network |
| OCP | Open Core Protocol |