O&M - Operations and Maintenance
O/R - Originator/Recipient
OA - Optical Amplifier
OADM - Optical Add/Drop Multiplexer
OAEP - Optimal Asymmetric Encryption Padding
OAI - Open Archives Initiative
OAIS - Open Archival Information System
OAL - OEM Adaptation Layer
OAM - Object Allocation Map
OAM - Operation, Administration and Maintenance
OAMP - Operations, Administration, Maintenance and Provisioning
OAP - Open Automated Protocol
OARNET - Ohio Academic Resources Network
OASB - Oracle® Applications Standard Benchmark
OASIS - Organization for Advancement of Structured Information Standards
OBD - Object-Based Disk
OBI - Open Buying on the Internet
OBMC - Overlapped Block Motion Compensation
OBOE - Open Business Object Environment
OC - Optical Carrier
OCAP - Open Cable Application Platform
OCC - Optical Channel Carrier
OCC - Originating Call Control
OCC - Other Common Carrier
OCCF - Operator Communication Control Facility
OCF - Open Computing Facility
OCG - Optical Carrier Group
OCI - Open Connection Indication
OCIS - Optics Classification and Indexing Scheme
OCL - Object Constraint Language
OCLC - Online Computer Library Catalog
OCLM - Office Connect LAN Modem
OCLUG - Ottawa Carleton Linux Users Group
OCP - Open Core Protocol™
OCP - Oracle® Certification Program
OCP - Oracle® Certified Professional
OCP-IP - Open Core Protocol International Partnership
OCR - Optical Character Recognition
OCRS - Online Computing Reviews Service
OCS - Open Content Syndication
OCS - Operational Control System
OCS - Optical Convergence Switch
OCSP - Online Certificate Status Protocol
OCW - OpenCourseWare
OCX - OLE Custom Control
ODA - Office Document Architecture
ODA - Open Document Architecture
ODBC - Open DataBase Connectivity
ODC - Optical Disc Corporation
ODC - Optical Disk Cartridge
ODE - Object Development Environment
ODG - Object Developers Group
ODI - Open Data-link Interface
ODL - Object Description/Definition/Design Language
ODL - Open and Distance Learning
ODM - Object Data Manager
ODM - Original Design Manufacturer
ODMA - Open Document Management API
ODMG - Object Data Management Group
ODMR - On-Demand Mail Relay
ODN - Openwave® Developer Network
ODP - Open Directory Project
ODR - Octal Data Rates
ODR - One's Density Rule
ODRL - Open Digital Rights Language
ODS - Open Data Services
ODS - Open Domain Server
ODS - OpenServer Development System
ODS - Operational Data Store
ODSC - Optical Data Storage Center
ODT - On-Die Termination
OE - Operating Environment
OEM - Original Equipment Manufacturer
OESU - Outlook E-mail Security Update
OFC - Optical Fiber Conference
OFDM - Orthogonal Frequency Division Multiplexing
OFF - Object File Format
OFS - Object File System
OFS - Open File Server
OFTC - Open and Free Technology Community
OFX - Open Financial eXchange
OGSA - Open Grid Services Architecture
OGSI - Open Grid Services Infrastructure
OH - Off Hook
OHCI - Open Host Controller Interface
OIA - Open Information Access
OID - Object ID
OIF - Optical Internetworking Forum
OILT - Online Instructor-Led Training
OIM - Open Information Model
OIM - OSI Internet Management
OIR - Online Insertion and Removal
OIS - Open Interface Specification
OIS - Organization for Internet Security
OIT - Office of Information Technology
OJI - Open JVM Integration
OKE - Open Kernel Environment
OKP - OpenServer Kernel Personality
OLAP - OnLine Analytical Processing
OLCE - OnLine Capacity Expansion