onference. e.g. LSAP, NSAP, etc.) Reseaux Associes pour la Recherche Europeene. Service Access Point Identifier. (Used within ISDN Residual Bit Error Ratio. (Measure of transmission Layer 2 frame.) quality. CCITT Rec. 594-1.) Search And Rescue. Regional Bell Operating Company. (US local car- SARSAT Search And Rescue Satellite. riers formed after the divestiture of AT&T.) Satellite Buisness Systems. (USA.) Remote Concentrator Unit. SCADA Supervisory Control and Data Acquisition. (Inter- Remote Database Access. face for network monitoring.) RDBMS Relational Database Management System. Standards Council of Canada. Relative Distinguishing Name. (Used within OSI Single Channel Per Carrier. (A transmission tech- network management.) nique used in thin route satellite communication RDSQL Relational Database Structured Query Language. systems. See also SPADE.) Radio Frequency. (Signal.) Single Channel Voice Frequency. (One of the sig- Request For Comment. nalling systems used in telex, i.e. CCITT R.20.) Radio Frequency Interference. Synchronous Digital Hierarchy. Ready For Next Message. Specification Description Language. (CCITT rec- Relative Intensity Noise. (Measure of noise in an ommended language for specification and descrip- optical source.) tion of telecommunication systems.) Radio In The Loop. (Radio used for the subscriber's Speaker Dependent Recognition. (Speech recogni- local loop.) tion technique which requires training to individual Receive Only Earth Station. (For use with satellites.) caller's voice.) Remote Operation Invoke. Service Data Unit. (Data passed between layers in Read Only Memory. (Memory device, usually semi- the OSI Seven Layer model.) conductor, in which the contents are defined during Synchronous Digital Crossconnect. manufacture. The stored information can be read but Single European Act. (Amendment to the Treaty of not changed. See also PROM.) Rome.) Remote Operation Service. SECAM Sequence Coleur a Memoire. (Sequential Colour Remote Operation Service Element. (OSI applica- with Memory. F