 reverse address resolution protocol Regional Bell Operating Company resistance capacitance (time constant) resistance design reference equivalent residual excited linear predictive (coder) radio frequency radio frequency interference route identifier return loss receive loudness rating root mean square receive not ready receive ready revised resistance design receive reference equivalent Reed-Solomon (code); reconciliation sublayer receive signal level remote subscriber unit remote terminal return to zero source address signaling area/network code service access point service access point identifier segmentation and reassembly sub-band coding selective broadcast signaling SCADA supervisory control and data acquisition signaling connection control part signal channel per carrier signal-to-distortion ratio synchronous digital hierarchy synchronous data link control structured data transfer service data unit SECAM sequential color and memory signal frequency (signaling) start of frame delimiter SINAD signal + noise + distortion-to-noise + distortion ratio signaling link code subscriber line interface card single link procedure ACRONYMS AND ABBREVIATIONS send loudness rating switched multimegabit data service SMPTE Society of Motion Picture and Television Engineers station management sequence number S/N, SNR signal-to-noise ratio system network architecture subnetwork access protocol sequence number protection section overhead; start of heading SONET synchronous optical network signaling point stored program control synchronous payload envelope selective reject synchronous residual time stamp source service access point SSB, SSBSC single sideband, single sideband suppressed carrier single segment message segment type studio-to-transmitter link; Standard Telephone Laboratory synchronous transport module; synchronous transfer mode shielded twisted pair synchronous transport signal; space-time-space (switch) switched virtual circuit step-by-step (switch) terminal adapter Television Allocation Study Organization trans-a