83 O/S Operating System OA Order Administration or Office Automation OAGEE Official Airlines Guide Electronic Edition OASIS Outstanding Ansi Specialists Institution OASYS Office Automation System OBU Option Business Unit OC Operator Centralization OCAP Orange Cats Are Pretty OCC Other Common Carrier OCE Other Common Equipment OCRC Option Change Review Committee OCU Office Channel Unit OD Outdial ODA Overdosed Anarchists ODA Office Document Architecture ODAC Operations Distribution Administration Center ODD Operator Distance Dialing ODDD Operator Direct Distance Dialing ODI Open Data Interface ODS Overhead Data Stream OEM Original Equipment Manufacturer OFG Originally Funny Guys OFNPS Outstate Facility Network Planning System OGT Out-Going Trunk OGVT OutGoing Verification Trunk OIP Opportunity Investment Planning OIS Office and Information Systems OLR On-Line Revenge OLTM Optical Line Terminating Multiplexer OLTP On-Line Transaction Processing OMC Office of Munitions Control OMM Output Message Manual OMPF Operation and Maintenance Processor Frame ONAC Operations Network Administration Center ONAL Off Network Access Line ONI Operator Number Identification ONI Operator Number Identification OOD Office of Development (Central Engineering) OOFNet Our Own Fucking Net OP Option OP Outside Plant OPAL On-line Presentation Access Library OPC Originating Point Codes OPCR Operator Actions Program OPEN Open Protocol Enhanced Networks OPEOS Outside Plant Engineering and Operations System OPM Outage Performance Monitoring OPM Outside Plant Module OPOM Organizational Program Office Manager OPS Off Premises Station OPS Operations OPSM Outside Plant Subscriber Module OPX Off Premises Extension OR Originating Register ORB Office Repeater Bay ORM Optical Remote Module OTL Outlaws OS Operator Service OS Outstate OSAC Operator Services Assistance Center OSC Operator Services Center OSC Oscillator OSDS Operating System for Distributed Switching OSF Open Software Foundation OSI Open System Interconnection OSI Open Systems Interconnection OSO Originating Signaling Office OSP Office of Sales Programs OSP Outside Plant OSPS Operator Service Position System OSS Operator Service System OSS Operator Services System OST Originating Station Treatment OTA Office of Technology Assessment OTC Operating Telephone Company OTD Off the Dock OTDR Optical Time Domain Reflectometers OTP Order Transaction Processing OTR Operational Trouble Report OTS Off The Shelf OUTWATS Outward Wide Area Telecommunications Service OW Over-Write OX Outlaws Exchange