175AppendicesENQSOHACKACKACKACKACKEOTACKETXBCCSTXETXBCCSTXETXBCCSTXETXBCCEstablishment ofData Link(Phase 1)Heading textData text n-1Serial numberSerial numberSerial number Data text nData text 1Data Transmission(Phase 2)Release of DataLink(Phase 3)ReceivingStationSendingStationAppendix B.Communications Protocol DetailsB.1 BHT-protocol[ 1 ] Transmission Control SequencesShown below is a typical message transmission sequence supported by the BHT-protocol. This sequence example does not include transmission errors or negativeresponses.
