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ME Consultancy are proud to be BT's Growth Partner of The Year 2003-2004
| O&O | Owned & Operated |
| OAS | Organization of American States |
| OATS | Open Air Test Site |
| OB | Outside Broadcast (remote originated broadcast) |
| OBFCC | Olympic (Games) Broadcast Frequency Coordinating Committee |
| OCBO | Office of Communications Business Opportunities (FCC) |
| OCST | Office of Cable Signal Theft (of NCTA) |
| OC-x | Optical Carrier Level (SONET) |
| ODA | Open Data Aspplications |
| ODFM | Orthogonal Frequency Division Multiplex |
| ODVA | Open DeviceNet Vendor Association |
| OECD | Organization for Economic Cooperation & Development |
| OEIC | Optoelectronic Integrated Circuit |
| OET | FCC Office of Engineering & Technology (formerly OST) |
| OFS | Operational Fixed Service |
| OIC | FCC Office of International Communications |
| OIRT | Organization for International Radio & Television |
| OIT | Inductive Output Tube |
| OIW | Open System Environment Implementors Workshop |
| OM | Operations Manager (at broadcast station) |
| OM&L | Obstruction Marking & Lighting (for antenna towers) |
| OMB | Office of Management & Budget (U.S. Government) |
| OMD | FCC Office of Managing Director |
| OMG | Object Management Group |
| OPA | FCC Office of Public Affairs |
| OPP | FCC Office of Plans & Policy |
| OPTS | Overtheair Programming Teleservice |
| OQPSK | Offset Quadrature Phase Shift Keying |
| OROM | Optical Read Only Memory (for data storage) |
| ORTF | Office de Radiodiffusion-Television Francaise |
| OS | Off Screen |
| OS | Operations System |
| OSF | Open Software Foundation |
| OSHA | Occupational Safety & Health Administration |
| OSI | Optimum Source Impedance |
| OSI | Open System Interconnect/Interconnection |
| OSM | Office of Spectrum Management (NTIA U.S. Commerce Dept.) |
| OSP | Online/Operator Service Provider |
| OSS | Operations Support System(s) |
| OST | FCC Office of Science & Technology (renamed OET) |
| OSTP | Office of Science & Telecommunications Policy |
| OTA | Office of Technology Assessment (U.S. Congress) |
| OTA | Over the Air Activation |
| OTAF | OverTheAir Service Provisioning Function |
| OTAPA | Over the Air Parameter Administration |
| OTASP | Over the Air Service Provisioning |
| OTDR | Optical Time-domain Reflectometers |
| OTL | Output TransformerLess (in audio amplifiers) |
| OTO | One Time Only |
| OTP | Office of Telecommunications Polity (now NTIA) |
| OVS | Open Video System/Services |