Remote data transmission
Remote data transmission ( DFÜ ) is the transmission of data between computers via a medium in which an additional communication protocol is used. Dial-up data transmission via the telephone network is most widespread . Other transmission media such as radio or light ( IrDA ) are also common.
In the German-speaking area, the much more narrowly defined Electronic Data Interchange (EDI) is called DFÜ in a more specific sense . Systems for the remote switching of systems and remote control devices of the BMSR can use standards from remote data transmission. Communication with a PC on the Internet is also a form of remote data transmission. In order to be able to transmit the data, they have to be suitably prepared for the medium. Special hardware is required for this , e.g. B. a modem or an ISDN card is necessary.
In the early days of remote data transmission, it was common to use floppy disks , magnetic tapes , punched tapes and to send these data carriers by courier (the so-called sneaker network ) to exchange data .
Electronic remote data transmission was initially also operated via special adapters on special data or telex lines, via teleprinters , but also via serial interfaces and analog telephone lines or via simple radio links . For this purpose, acoustic couplers that could be attached to a normal telephone receiver and later modems were used.
The EDI was also available to private users at the end of the 1980s with the local and global mailbox systems that were created, e.g. B. the FidoNet , the MausNet , Compuserve or the Datex-P are of great importance. Since 1988, the technical universities have provided students with an (external) login option to the computer centers via university access and, from 1989, also access to UseNet. At the beginning, these ports were designed for a transmission speed of 300 baud, so that students could use their access to the university data center from their home PC with a modem.
The first chat options were available in individual mailboxes, such as the WDR mailbox in Cologne and the Elsa mailbox in Aachen, since 1988. At that time, the maximum number of users in the chat was determined by the available ports, each of which was assigned to a different telephone number: In 1988, multi-user chat was only possible via a multi-port system.
Methods and transmission standards
- WIRELESS INTERNET ACCESS
- DSL with the variants ADSL , ADSL2 + , SDSL and VDSL
- DOCSIS ( cable modem )
- GSM with the extensions HSCSD , GPRS and EDGE
- UMTS with the extension HSDPA
- LTE with the LTE-Advanced extension
- Peter Welzel: Remote data transmission. Introductory basics for communication in open systems, Friedrich Vieweg & Sohn Verlag, Wiesbaden 1986, ISBN 978-3-663-00129-4 .
- PF Kuhrt, R. Giesecke, V. Maurer: Remote data transmission. Springer Fachmedien, Wiesbaden 1966.
- H. Hofer: Remote data processing. Branch office - remote data transmission - data center - operational processes, Springer Verlag, Berlin / Heidelberg 1973, ISBN 978-3-540-06139-7 .
- Hubert Zitt: ISDN & DSL for PC and telephone. Verlag Markt + Technik, Munich 2005, ISBN 3-8272-6987-3 .
- Key B. Hacker: Macintosh. A computer and its environment, Springer Fachmedien, Wiesbaden 1984, ISBN 978-3-528-04326-1 .
- Harald Schumny: Signal transmission. Textbook of telecommunications with remote data processing. 2nd edition, Friedrich Vieweg & Sohn Verlag, Wiesbaden 1987, ISBN 978-3-528-14072-4 .
- Remote data transmission (accessed on August 31, 2017)