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- operating system (OS)
- operations, administration, management, and provisioning (OAM&P)
- operations and maintenance (O&M)
- operations support system (OSS)
- operator
- operator
- operator
- OPS (Off-Premises Station)
- optical
- optical add/drop multiplexer (OADM)
- Optical Carrier (OC)
- optical character recognition (OCR)
- optical cross-connect (OXC)
- optical data unit (ODU)
- optical-electrical-optical (OEO)
- optical fiber
- optical fiber, conductive (OFC)
- optical fiber, conductive, plenum (OFCP)
- optical fiber, conductive, riser (OFCR)
- optical fiber, nonconductive (OFN)
- optical fiber, nonconductive, plenum (OFNP)
- optical fiber, nonconductive, riser (OFNR)
- optical isolator
- optical line-of-sight (optical LOS)
- optical line terminal (OLT)
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