Method and apparatus for facilitating communication in a multilayer communication architecture via a dynamic communication channel

• US 5,448,566 A
• Filed: 11/15/1993
• Issued: 09/05/1995
• Est. Priority Date: 11/15/1993
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Stark, David R. Jr., Richter, Roger K.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): VU, HUY DUY
• Application Number:
  US08/152,795
• Time in Patent Office: 659 Days
• Field of Search: 370/85.13, 370/85.14, 370/85.7, 370/94.1, 370/94.2, 370/93, 370/92, 370/110.1, 370/60, 370/60.1, 370/110.1, 370/58.1, 379/94, 379/96, 379/95.1, 379/58.1, 379/54, 379/85.1, 379/85.7, 379/79, 379/17, 395/500, 395/200, 395/275, 395/325
• US Class Current: 370/431
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A data processing system is provided for interfacing with a computing resource coupled to a remotely located network. A multilayer communication architecture, implemented utilizing a multilayer protocol stack, is provided for facilitating communication between network resources and applications running within the data processing system. Within the multilayer protocol stack, a media access control emulator is provided for interfacing with an application requesting access to a computer resource coupled to a remotely located network. The media access control emulator presents a standard media access control interface to the requesting application. A connection utility is provided for managing communication between the media access control emulator and a dynamic communication channel. In response to receiving an application or user instigated request to communicate with the computing resource coupled to the remotely located network, the media access control emulator automatically suspends access to the remotely located computer resource by emulating a pre-established operating condition, such as discarding a packet of data sent by the application and returning an out of resource indication to the application. During such automatic suspension of access, the connection utility establishes communication with the remotely located network via the dynamic communication channel. Once communication has been established, the requesting application is allowed access to the computer resource coupled to the remotely located network via the dynamic communication channel, wherein the media access control emulator and the connection utility mask the dynamic nature of the dynamic communication channel from the requesting application.

Claims

1. A method in a data processing system for interfacing a computing resource coupled to a remotely located network with an application running within said data processing system via a dynamic communication channel, said network including a multilayered communication architecture, implemented utilizing a multilayered protocol stack, for facilitating communication between network resources, said method comprising the steps of:

providing a media access control emulator for interfacing with an application running within said data processing system;

providing a connection utility for managing communication between said media access control emulator and said dynamic communication channel;

presenting a standard media access control interface to said application running within said data processing system utilizing said media access control emulator;

in response to an application attempt to communicate with said computing resource coupled to said remotely located network;

(a) automatically suspending access to said computing resource coupled to said remotely located network by utilizing said media access control emulator to emulate a preestablished operating condition;

(b) simultaneously establishing communication with said remotely located network via said dynamic communication channel utilizing said connection utility; and

allowing said application access to said computing resource coupled to said remotely located network via said dynamic communication channel, wherein said media access control emulator and said connection utility mask the dynamic nature of said dynamic communication channel from said application.

2. The method according to claim 1 further including the step of binding said media access control emulator with said multilayered protocol stack.

3. The method according to claim 1 wherein the step of simultaneously establishing communication with said remotely located network via said dynamic communication channel utilizing said connection utility includes the steps of:

determining an appropriate protocol for communicating with said remotely located network; and

binding said media access control emulator with a selected wide area network media access control coupled to a selected medium attachment unit as determined by said appropriate protocol for communicating with said remotely located network.

4. The method according to claim 1 wherein said dynamic communication channel is a public switched telephone network.

5. The method according to claim 1 wherein said step of automatically suspending access to said computing resource coupled to said remotely located network by utilizing said media access control emulator to emulate a preestablished operating condition includes the steps of:

discarding a packet of data sent to said media access control emulator by said application; and

returning an out of resource indication to said application.

6. The method according to claim 1 further including the step of closing and unbinding said selected wide area network media access control from said media access control emulator when access to said computing resource coupled to said remotely located network is terminated.

7. The method according to claim 1 wherein the step of presenting a standard media access control interface to an application running within said data processing system utilizing said media access control emulator further includes presenting a high level data link control (HDLC) media access control interface to an application running within said data processing system utilizing said media access control emulator.

8. A means for interfacing a computing resource coupled to a remotely located network with an application running within a data processing system via a dynamic communication channel, said network including a multilayered communication architecture, implemented utilizing a multilayered protocol stack, for facilitating communication between network resources, comprising:

a media access control emulator for interfacing with an application running within said data processing system;

a connection utility for managing communication between said media access control emulator and said dynamic communication channel;

said means for interfacing being operable in a plurality of modes, including;

(a) an emulation mode wherein said media access control emulator presents a standard media access control interface to said application running within said data processing system;

(b) a suspend mode wherein, in response to an application attempt to communicate with said computing resource coupled to said remotely located network, said media access control emulator automatically suspends access to said computing resource coupled to said remotely located network by emulating a preestablished operating condition;

(c) a connect mode wherein said connection utility establishes communication with said remotely located network via said dynamic communication channel while said media access control emulator suspends access to said computing resource coupled to said remotely located network; and

(d) a data transfer mode wherein said media access control emulator allows said application to access to said computing resource coupled to said remotely located network via said dynamic communication channel by transferring data between said multilayered protocol stack and said dynamic communication channel.

9. The means for interfacing according to claim 8 further including a binding mode of operation wherein said media access control emulator binds with said multilayered protocol stack.

10. The means for interfacing according to claim 8 wherein said connect mode includes the steps of:

determining an appropriate protocol for communicating with said remotely located network; and

binding said media access control emulator with a selected wide area network media access control coupled to a selected medium attachment unit as determined by said appropriate protocol for communicating with said remotely located network.

11. The means for interfacing according to claim 8 wherein said dynamic communication channel is a public switched telephone network.

12. The means for interfacing according to claim 8 wherein said suspend mode includes the steps of:

discarding a packet of data sent to said media access control emulator by said application; and

returning an out of resource indication to said application.

13. The means for interfacing according to claim 8 further including a close and unbind mode wherein said connection utility directs said media access control emulator to close and unbind said selected wide area network media access control when access to said computing resource coupled to said remotely located network is terminated.

14. The means for interfacing according to claim 8 wherein said emulation mode includes the step of presenting a high level data link control (HDLC) media access control interface to an application running within said data processing system.

15. A communications interface system for interfacing a data processing system with a computing resource coupled to a remotely located network with an application running within said data processing system via a dynamic communication channel, said network including a multilayered communication architecture, implemented utilizing a multilayered protocol stack, for facilitating communication between network resources, comprising:

a media access control emulator for presenting a standard media access control interface to said application running within said data processing system, and for automatically suspending access to said computing resource coupled to said remotely located network by emulating a preestablished operating condition in response to an application attempt to communicate with said computing resource coupled to said remotely located network;

a connection utility for managing communication between said media access control emulator and said dynamic communication channel, and for establishing communication with said remotely located network via said dynamic communication channel while said media access control emulator automatically suspends access to said computing resource coupled to said remotely located network; and

means for allowing said application access to said computing resource coupled to said remotely located network via said dynamic communication channel, wherein said media access control emulator and said connection utility mask the dynamic nature of said dynamic communication channel from said application.

16. The communications interface system according to claim 15 further including means for binding said media access control emulator with said multilayered protocol stack.

17. The communications interface system according to claim 15 wherein said connection utility includes:

means for determining an appropriate protocol for communicating with said remotely located network; and

means for binding said media access control emulator with a selected wide area network media access control coupled to a selected medium attachment unit as determined by said appropriate protocol for communicating with said remotely located network.

18. The communications interface system according to claim 15 wherein said dynamic communication channel is a public switched telephone network.

19. The communications interface system according to claim 15 wherein said means for automatically suspending access to said computing resource coupled to said remotely located network includes:

means for discarding a packet of data sent to said media access control emulator by said application; and

means for returning an out of resource indication to said application.

20. The communications interface system according to claim 15 wherein said connection utility further includes means for directing said media access control emulator to close and unbind said selected wide area network media access control when access to said computing resource coupled to said remotely located network is terminated.

21. The communications interface system according to claim 15 wherein said means for presenting a standard media access control interface includes means for presenting a high level data link control (HDLC) media access control interface to an application running within said data processing system.