operations security
operations security (OPSEC)
operations system
operator service access point (OSAP)
operator service provider
Operator Service Provider (OSP)
operator services
operator system
operator trunks
OPSEC
optical amplifier
optical attenuator
optical axis
optical beamsplitter
optical cable
| optical cable assembly
optical carrier level 1 (OC-1)
optical cavity
optical character reader (OCR)
optical character recognition (OCR)
optical conductor
optical connector
optical coupler
optical density (OD)
optical detector
optical disk
optical dispersion
optical fiber
optical fiber cable
optical fiber coating
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