Communication controller allowing continued communication through an X25 network and an SNA network in the event of an SNA session failure
First Claim
1. A communication controller in a telecommunication network including a first SNA subnetwork and a second X25 packet switched network for allowing communication between application programs running in at least one host computer and numerous Data Terminating equipments (DTE) attached to said X25 packet switched network and communicating by means of virtual circuits (VC), said communication controller comprising:
- means for establishing predetermined SNA sessions between said communication controller and said application programs;
means for linking a plurality of virtual circuits on one of said predetermined SNA sessions;
means for storing a set of alternate session tables defining for each of said predetermined SNA sessions a prioritized list of alternate backup sessions;
means for detecting the occurrence of a failure on one SNA sessions;
means for switching the virtual circuits linked to said session being subject to the failure to one backup session defined in the corresponding alternate session table.
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Accused Products
Abstract
Communication controller allowing communication between application programs running in at least one host computer and DTEs 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 tables and logic for establishing predetermined SNA sessions between the application programs and the communication controller, and tables and logic for linking at least one virtual circuit on a predetermined SNA session. The controller further includes memory for storing a set of alternate session tables defining, for each of said established predetermined SNA sessions, a prioritized list of alternate backup sessions, logic for detecting the occurrence of one failure on one SNA session, and logic for switching the virtual circuits linked to said session being subject of a failure to one backup session defined in the corresponding alternate session table. The alternate sessions being pre-established, the virtual circuits can be immediately connected to one alternate session without requiring further delay. A quick end-user reconnection is then allowed.
43 Citations
7 Claims
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1. A communication controller in a telecommunication network including a first SNA subnetwork and a second X25 packet switched network for allowing communication between application programs running in at least one host computer and numerous Data Terminating equipments (DTE) attached to said X25 packet switched network and communicating by means of virtual circuits (VC), said communication controller comprising:
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means for establishing predetermined SNA sessions between said communication controller and said application programs; means for linking a plurality of virtual circuits on one of said predetermined SNA sessions; means for storing a set of alternate session tables defining for each of said predetermined SNA sessions a prioritized list of alternate backup sessions; means for detecting the occurrence of a failure on one SNA sessions; means for switching the virtual circuits linked to said session being subject to the failure to one backup session defined in the corresponding alternate session table. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification