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Wireless Networking Glossary
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O
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| O&M | Operations and Maintenance |
| OA&M | Operations, Administration and Maintenance |
| OC-1 | SONET service at 51.84 Mbps. Equivalent to one DS3 (672 DS0) |
| OC-12 | SONET service at 622.08 Mbps. Equivalent to 12 DS3 or 8,064 DS0 |
| OC-18 | SONET service at 933.12 Mbps. Equivalent to 18 DS3 or 12,096 DS0 |
| OC-192 | SONET service at 9.95328 Gbps. Equivalent to 192 DS3 or 129,024 DS0 |
| OC-24 | SONET service at 1.24416 Gbps. Equivalent to 24 DS3 or 16,128 DS0 |
| OC-3 | SONET service at 155.52 Mbps. Equivalent to 3 DS3 or 2,016 DS0 |
| OC-36 | SONET service at 1.86624 Gbps. Equivalent to 36 DS3 or 24,192 DS0 |
| OC-48 | SONET service at 2.48832 Gbps. Equivalent to 48 DS3 or 32,256 DS0 |
| OC-768 | SONET service at 38.813 Gbps. Equivalent to 768 DS3 |
| OC-9 | SONET service at 466.56 Mbps. Equivalent to 9 DS3 or 6,048 DS0 |
| OC-96 | SONET service at 4.97664 Gbps. Equivalent to 96 DS3 or 64,512 DS0 |
| OCDM | Optical Code Division Multiplexing |
| OCH | Optical Channel |
| OC-x | Optical Carrier Levels (OC-x) SONET includes a set of signal rate multiples for transmitting digital signals on optical fiber. The base rate (OC-1) is 51.84 Mbps. |
| OFDM | Orthogonal Freqimcu Division Multiplex |
| OG | Optical Gateway |
| OPEX | Operating Expenses. |
| OSI | Open System Interconnection. Layered set of protocols in which programming at both ends of communications exchange uses an identical set of layers. Defines networking as 7 layers, each with own protocols to be performed in order for program-to-program communication to take place between computers. See Layers 1-7. |
| OSPF | Open Shortest Path First (OSPF) is a link-state, hierarchical Interior Gateway Protocol (IGP) routing algorithm. The well known Dijkstra's algorithm is used to calculate the shortest path tree. It uses cost as its routing metric. A link state database is constructed of the network topology which is identical on all routers. |
| OSS | Operations Support Subsystem |
| OTA | Over-the-Air programming. Uploads internal mobile tables or software. |
| OXC | Optical Cross Connect |