Communication controller allowing communication through an X25 network and an SNA network.

摘要

Communication controller (107) allowing communication between application programs running into at least one host computer (100, 101) and DTEs (110) attached to a X25 packet switched network and communicating through virtual circuits (VC), the communication being provided through the X25 network and a Systems Network Architecture (SNA) network. The controller includes means for establishing predetermined SNA sessions between the application programs and the communication controller, and means for linking at least one virtual circuit on a predetermined SNA session. The controller further includes means for storing a set of alternate session tables defining for each of said pre-established SNA session a prioritized list of alternate backup sessions, means for detecting the occurrence of one incident on one SNA session, means for switching the virtual circuits linked to said session being subject of an incident to one backup session defined in the corresponding alternate session table. The alternate sessions being pre-established, the virtual circuits can be right away connected to one alternate session without requiring further delay. A quick end-user reconnection is then allowed. <IMAGE>