Sublayer

1. In a layered open communications system, a specified subset of the services, functions, and protocols included in a given layer.
2. In the Open Systems Interconnection--Reference Model, a subdivision of a given layer, e.g., a conceptually complete group of the services, functions, and protocols included in the given layer.

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specification specific detectivity speckle pattern spectral width speed of service spill forward feature spread spectrum squelch standard telegraph level standard test signal standard test tone	standard time and frequency signal service standby standing wave standing wave ratio star coupler start signal start stop transmission statement steady state condition step index profile stopband	stop signal store and forward switching center stressed environment stroke speed subscriber substitution method successful block transfer sudden ionospheric disturbance summation check supervisory program reduced carrier transmission	surface wave survivability switched loop switched multimegabit data services synchronism synchronizing synchronous network synchronous orbit system integrity system lifecycle systems control