Datex-L DCE

Data Communications Equipment (DCE) for CSPDN__Datex-L came in different flavors. It was owned and serviced by the Telco (Deutsche Bundespost).

User interface

The user interface could be implemented in
  • X.20
  • X.20bis
  • X.21
  • X.21bis

The synchronous X.20/X.21 interfaces were offered at a lower cost (20-30 DM per month less) than the asynchronous X.20bis/X.21bis variants, due to the simpler DCE design for synchronous networks.

Furthermore, the DCE for asynchronous interfaces had to include a keypad to allow the user to manually dial the destination subscriber. Only the synchronous X.21 interface specifies a method how the DTE could dial directly.


  • Siemens DFG-300 with X.21bis
  • Siemens DFG-9600UE-1 with X.21bis
  • Siemens DFG-9600UE-2 with X.21

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Updated by laforge about 1 year ago · 2 revisions

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