CO cycle Close-open cycleCodirectional Way of transmitting G.703 over a balanced line. Involves two twistedpairs making it possible to transmit information in both directionsCOM CommandCOMTRADE Standard Common Format for Transient Data Exchange format forDisturbance recorder according to IEEE/ANSI C37.111, 1999 / IEC60255-24Contra-directional Way of transmitting G.703 over a balanced line. Involves four twistedpairs, two of which are used for transmitting data in both directionsand two for transmitting clock signalsCOT Cause of transmissionCPU Central processing unitCR Carrier receiveCRC Cyclic redundancy checkCROB Control relay output blockCS Carrier sendCT Current transformerCU Communication unitCVT or CCVT Capacitive voltage transformerDAR Delayed autoreclosingDARPA Defense Advanced Research Projects Agency (The US developer of theTCP/IP protocol etc.)DBDL Dead bus dead lineDBLL Dead bus live lineDC Direct currentDFC Data flow controlDFT Discrete Fourier transformDHCP Dynamic Host Configuration ProtocolDIP-switch Small switch mounted on a printed circuit boardDI Digital inputDLLB Dead line live busDNP Distributed Network Protocol as per IEEE Std 1815-2012DR Disturbance recorderDRAM Dynamic random access memoryDRH Disturbance report handlerDSP Digital signal processorDTT Direct transfer trip schemeEHV network Extra high voltage networkEIA Electronic Industries AssociationEMC Electromagnetic compatibilityEMF Electromotive forceEMI Electromagnetic interferenceSection 18 1MRK 505 355-UEN AGlossary268Application manual
