Data transmission device

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Each data transmission system is formed by (at least) two data stations that are connected to one another by a transmission path (generally: communication device).

Components and function

Data transfer between two data stations

Each data station consists of DIN 44302

  • the data terminal equipment (DEE) (English Data Terminal Equipment - DTE) and
  • the data transmission equipment (DÜE) (English Data Communication Equipment - DCE).

This division into two devices, namely a data terminal device and a data transmission device, originates from the time when the communication networks were still predominantly in the hands of state postal administrations. As a rule, their sovereignty extended to the interface ( DIN 66020 and DIN 66021) between them, the DCE was a separate device that had to be rented. The DEE works with signal shapes and voltages that are not suitable for transmission on long-distance lines. It is the duty of the DCE to convert them into signals that are suitable for transmission on long-distance lines. The tasks of the interfaces result from the respective transmission method. After the abolition of the telecommunications monopoly, this division of DEE and DÜE into different devices was unnecessary. Today DEE and DÜE are only functional separations, but the functions can be combined in a single device.

The data terminal equipment is a device that

can. The DEE has a standardized interface that can be connected to a data transmission device. A peripheral data terminal is called a data terminal or terminal . Typical data terminal devices are monitors , printers , data registers , cash dispensers , etc. As a rule, at least one of the data terminal devices involved in every data transmission system is a computer . If at least two data terminal devices are computers, there is a computer network .

The data transmission device (example: modem ) consists of

  • the signal converter and
  • the connection unit
  • If necessary, error monitoring unit (device-dependent)
  • if necessary synchronization unit (device-dependent)

The task of the DÜE is to adapt the signals emitted by the data terminal equipment to the transmission path. Each of these units can be equipped with a transmitting part and a receiving part. If an automatic dialing device is available to establish the connection, this is part of the data transmission device.

The signal converter converts the data signals supplied by the DTE into a form suitable for transmission and / or converts the data signals received from the transmission line into the form prescribed for the interface . In the case of line - oriented dial - up networks , DCE can also take on switching tasks.

See also

literature

  • Peter Bocker: data transfer . Volume I - Basics . Springer Verlag, Berlin / Heidelberg 1976, ISBN 978-3-662-06499-3 .
  • Herbert Bernstein: Information and communication electronics . De Gruyter Verlag, Oldenburg 2015, ISBN 978-3-11-036029-5 .
  • Jürgen Rasch: Information processing . Friedrich Vieweg & Sohn, Wiesbaden 1998, ISBN 978-3-528-05675-9 .
  • Hugo Schröer, Thomas Stalke: The SNA network architecture . Friedrich Vieweg & Sohn, Wiesbaden 1993, ISBN 978-3-322-91564-1 .
  • Ulrich Freyer: News transmission technology. Basics, components, processes and systems of telecommunications technology . 1st edition. Carl Hanser Verlag, Munich 2009, ISBN 978-3-446-41462-4 .

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