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- octet
- octothorpe
- OD (Outside Diameter)
- ODU (Optical Data Unit)
- OEM (Original Equipment Manufacturer)
- OEO (Optical-Electrical-Optical)
- OFC (Optical Fiber, Conductive)
- OFCP (Optical Fiber, Conductive, Plenum)
- OFCR (Optical Fiber, Conductive, Riser)
- OFDM (Orthogonal Frequency Division Multiplexing)
- offered load
- off-hook
- off-hook voice announce
- off-premises extension (OPX)
- off-premises station (OPS)
- offset quadrature phase shift keying (OQPSK)
- offshoring
- OFN (Optical Fiber, Nonconductive)
- OFNP (Optical Fiber, Nonconductive, Plenum)
- OFNR (Optical Fiber, Nonconductive, Riser)
- OH
- Ohm, Georg Simon (1787–1854)
- Ohm’s Law
- Ohm’s Law
- OLT (Optical Line Terminal)
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