O
- Open Shortest Path First (OSPF)
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A network routing protocol.
- Open Systems Interconnect (OSI) model
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A layered model for data communications, defined by an International Organization for Standardization committee.
- optical time-domain reflectometer (OTDR)
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An optical fiber test tool that locates fiber faults.
- ordered set
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A single special code-group or a combination of special and data code-groups that represent a signal such as an idle or the start of a frame.
- organizationally unique identifier (OUI)
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A 3-byte code assigned by the IEEE, usually for use as a MAC address prefix.
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