application program interface (API)

Synonymous with application programming interface. See API.

• optical network terminal (ONT)
• optical network unit (ONU)
• optical-optical-optical (OOO)
• optical transport network (OTN)
• optical transport unit (OTU)
• optics
• OPX (Off-Premises eXtension)
• OQPSK (Offset Quadrature Phase Shift Keying)
• orange hose
• orderwire
• .org (organization)
• original band (O-Band)
• original equipment manufacturer (OEM)
• or ITU-TSS)
• orthogonal
• orthogonal frequency division multiplexing (OFDM)
• oscillate
• oscillate
• oscillator
• oscillator
• OSI Reference Model (Open Systems Interconnection Model)
• OS (Operating System)
• OSPF (Open Shortest Path First)
• OSP (OutSide Plant)
• OSS (Operations Support System)