Change Indicators

* 3155 Communication channel qualifier [C] Desc: Code identifying the type of communication channel being used. Repr: an..3 AA Circuit switching A process that, on demand, connects two or more data terminal equipments and permits the exclusive use of a data circuit between them until the connection is released (ISO). AB SITA Communications number assigned by Societe Internationale de Telecommunications Aeronautiques (SITA). AC ARINC Communications number assigned by Aeronautical Radio Inc. AD AT&T mailbox AT&T mailbox identifier. AE Peripheral device Peripheral device identification. AF U.S. Defense Switched Network The switched telecommunications network of the United States Department of Defense. AG U.S. federal telecommunications system The switched telecommunications network of the United States government. CA Cable address Self explanatory. EI EDI transmission Number identifying the service and service user. | EM Electronic mail Exchange of mail by electronic means. EX Extension Telephone extension. FT File transfer access method According to ISO. FX Telefax Device used for transmitting and reproducing fixed graphic material (as printing) by means of signals over telephone lines or other electronic transmission media. GM GEIS (General Electric Information Service) mailbox Self explanatory. IE IBM information exchange Self explanatory. IM Internal mail Internal mail address/number. MA Mail Postal service document delivery. PB Postbox number Self explanatory. PS Packet switching The process of routing and transferring data by means of addressed packets so that a channel is occupied only during the transmission; upon completion of the transmission the channel is made available for the transfer of other packets (ISO). SW S.W.I.F.T. Communications address assigned by Society for Worldwide Interbank Financial Telecommunications s.c. TE Telephone Voice/data transmission by telephone. TG Telegraph Text transmission via telegraph. TL Telex Transmission of text/data via telex. TM Telemail Transmission of text/data via telemail. TT Teletext Transmission of text/data via teletext. TX TWX Communication service involving Teletypewriter machines connected by wire or electronic transmission media. Teletypewriter machines are the devices used to send and receive signals and produce hardcopy from them. XF X.400 CCITT Message handling system.