| 序号 | 中 文 | 英 文 | 术语解释 | 缩写 | 来源 |
| 61 | 对象管理结构 | Object Management Architecure | OMA | ||
| 62 | 操作维护中心 | Operation and Maintenance Centre | OMC | ||
| 63 | 对象管理组 | Object Management Group | OMG | ||
| 64 | 操作维护链路 | Operation and Maintenance LinkCentre | OML | ||
| 65 | 光网络单元 | Optical Network Unit | ONU | ||
| 66 | 带外 | Out Of Band | OOB | ||
| 67 | 一对一行销 | One to One Marketing | OOM | ||
| 68 | 偏移四相移相键控 | Offset Quadrature Phase Shift Keying | OQPSK | ||
| 69 | 最佳路由选择 | Optimal Routeing | OR | ||
| 70 | ODMA随机接入信道 | ODMA Random Access Channel | ORACH | ||
| 71 | 对象请求代理 | Object Request Broker | ORB | ||
| 72 | 对滞后呼叫前转的最佳路由选择 | Optimal Routeing for Late Call Forwarding | ORLCF | ||
| 73 | 对象支持 | Object Supports | OS | ||
| 74 | 始发用户 | Oeiginating Subscriber | OS | ||
| 75 | 操作系统 | Operating System | OS | ||
| 76 | 运行系统 | Operation System | OS | ||
| 77 | 光（纤）段 | Optical Section | OS | ||
| 78 | 光发射机 | Optical Sender | OS | ||
| 79 | 光开关（交换） | Optical Switch | OS | ||
| 80 | 出局发码器 | Outgoing Sender | OS |