O

OA        Optical Amplifier
OAM       Operation And Maintenance (OAM)
OC        Optical Carrier
OC-1      Optical Carrier, level 1
OC-3      Optical Carrier, level 3
OCC       Other Common Carrier
OCR       Optical Character Recognition
ODA       Open Document Architecture
ODBC      Open Data Base Connectivity
OE        Optical Extension
OE        Originating Equipment
OECD      Organization for Economic Cooperation and Development
OIM       Operations Interface Module
OLE       Object Linking and Embedding
OLO       Other Local Operator
OMC       Operation and Maintenance Centre (GSM)
ONA       Open Network Architecture
ONP       Open Network Provision
ONU       Optical Network Unit
OOK       On-Off Keying
OOT       Object-Oriented Technology
OPC       Output Port Controller
OSNR      Optical Signal to Noise Reduction    
O-PSK     Offset-keyed PSK
OPX       Off-Premises eXtension
O-QAM     Offset QAM
O-QASK    Offset QASK
ORB       Object Request Broker
OS        Operations System
OS        Operations System
OSF       Open Systems Foundation
OSHA      Occupational Safety and Health Administration
OSI       Open System Interconnection
OSI/NMF   Open Systems Interconnection/Network Management Forum
OSP       Outside Serving Plant
OSPF      Open Shortest Path First 
OSS       Operations Support System
OTP       Open Trading Protocol (Internet Commerce)
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