Here are the most common telecom acronyms starting with O from the world of computer networking.

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Acronym Description
O&M Operations and Maintenance
O/W Orderwire (NOCC)
OA Office Automation Data
OA Operator Assisted
OA Operator Attached (signal)
OA Order Administration
OA&M Operations, Administration, and Maintenance
OAM Once a Month
OAM&P Operations, Administration, Maintenance and Provisioning
OAS Organization of American States
OATS Order Administration Tracking System
OAU Office Alarm Unit
OBR Optical Bar Code
OC Operations Center
OC Operator Centralization
OCC Other Common Carrier
OCD Operations Capability Demonstration
OCL Operation Control Language
OCLC Ohio College Library Center
OCLID Outgoing Called Line Identification
OCR Optical Character Reading (or Recognition)
OCS Order Coordination Service
OCU Office Channel Unit
ODA Office Data Administration
ODA Office Documentation Architecture
ODBE Office Data Base Editor
ODD Office Dependent Data
ODE Ordinary Differential Equation
ODEN Outgoing Data Enable (signal)
OE Office Equipment
OE Order Entry
OE/SOTS Order Entry & Svc Order Tracking System
OECD Organization for Economic Cooperation and Development
OEIC Optoelectronic Integrated Circuit
OEM Original Equipment Manufacturer
OFA Operations Facility Assignment
OFPP Office of Federal Procurement Policy (OMB)
OGT Outgoing Trunk
OHQ Off-hook Queuing
OHQT Off-hook Queuing Tone
OIRA Office of Information and Regulatory Affairs (OMB)
OLTDS On-Line Testing and Diagnostics Subsystem
OLTM Optical Line Terminating Multiplexer
OLTP On-Line Transaction Processing
OM Operational Measurement(s)
OM Operational Measurements
OM Operations and Maintenance
OM HOST Operational Measurements Host
OMAC Operations, Maintenance, Administration and Control
OMAP Operation and Maintenance Application Point
OMAT Operation Measurement and Analysis Tool
OMB Office of Management and Budget
OMB Outgoing Message Buffer
OMF Operations Material Forecast
OMG Order Management Group
OML Outgoing Matching Loss
OMP Operation and Maintenance Processor
OMR Optical Mark Reading
OMS Operating Measurement System
OMS Operational Measurement System
OMS Operational Measurements
OMS Operations Management System
OMS5 5ESS Office Monitoring System (AT&T)
ONA Open Network Architecture
ONAL Off Network Access Line
ONI Operator Number Identification
ONI Optical Network Interface
ONP Open Network Provision
ONTC Office Network and Timing Complex
OOF Out of Frame
OOMS Office of Organization and Management Systems
OOS Out of Service
OOS Out of Service (circuits, clearing time, tickets)
OP Originating Party
OPART Origination Partition
OPART/STS Originating Partition/Serving Translation Scheme
OPC Origination Point Code
OPEN Open Protocol Enhanced Network
OPG Operations Recovery Group
OPL Outpulsing Programming Language
OPM Office of Personnel Management
OPM Operations per Minute
OPM Outside Plant Module
OPRT Operator intercept
OPS Operations Department
OPS Order Processing System(s)
OPUS On-line Promotion Update System
OPX Off-premises Extension
OR Operator Released
OR/MS Operations Research/Management Science
ORB Office Repeater Bay
ORD Operating Room Desk
ORD Operational Readiness Demonstration
ORDVAC Ordnance Variable Automatic Computer
ORM Optical Remote Module
ORName Originator/Recipient Name
ORR Office Release Record
ORRS On-line Records and Reporting System
OS Operating System
OS/MFT Operating System/Multiprogramming with a Fixed Number of Tasks
OS/MVS Operating System/Multiprogramming with Virtual Storage
OS/MVT Operating System/Multiprogramming with a Variable Number of Tasks
OS/VS1 Operating System/Virtual Storage 1
OS/VS2-MVS Operating System/Virtual Storage 2
OSAC Operator Speed of Answer Consistency
OSCSTAT Remote Clock Oscillator Status
OSDS Operating System for Distributed Switching
OSDS-C Operating System for Distributed Switching in the AM (Administrative Module)
OSDS-M Operating System for Distributed Switching in the SM (Switching Module)
OSF Open Software Foundation
OSHA Occupational Safety and Health Act
OSI Open System Interconnection (reference model)
OSM Oversight System Manager
OSN Operation Systems Network
OSO Originating Screening Office
OSP Operations and Service Processor (Tandem NonStop EXT computer)
OSP Outside Plant
OSPCAMIS Outside Plant Construction Activities Management Information System
OSPS Operator Services Position System
OSR Out-of-Service Record (database)
OSS Office Software Summary
OSS One-Stop Shopping
OSS Operations Support Services
OSS Operations Support System
OSS Operations Systems Support (NOCC)
OSS Operator Service System
OSSA Operational Support Systems – Atlanta
OSSC Operations System Support Center (NOCC)
OSSW Operational Support Systems – Western
OT Order Tasks
OTC Operating Telephone Company
OTDR Optical Time Domain Reflectometer
OTO Office to Office
OTP Office of Telecommunications Policy (Executive Office of the President)
OTR Operational Trouble Reports
OUTWATS (OUTWT) Outward Wide Area Telecommunications Service
OWR Operations Work Request

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