Abstract
The common data communications system for the German federal state of Nordrhein-Westfalen has been established to provide communications between different vendors' computers within the state administration. The system uses manufacturer-independent protocols such as X.25 (Layer 3), EHKP4 as the transport protocol (Layer 4), and protocols for file transfer and dialogue (line-mode). Network management facilities, and a centre for testing services, protocols and interfaces are in operation. The virtual terminal protocol is described in some detail, as the service has only recently been developed.
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