System for enabling first computer to communicate over switched network with second computer located within LAN by using media access control driver in different modes

• US 5,630,061 A
• Filed: 04/19/1993
• Issued: 05/13/1997
• Est. Priority Date: 04/19/1993
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Richter, Roger K., Stephenson, Quentin H., Sharp, Robert O.
• Primary Examiner(s): Lee, Thomas C.
• Assistant Examiner(s): MEKY, MOUSTAFA M
• Application Number:
  US08/049,895
• Time in Patent Office: 1,485 Days
• Field of Search: 395/275, 395/200, 365/200.02, 365/200.06, 365/200.1, 365/200.12, 365/200.2, 370/60, 370/94.1
• US Class Current: 709/227
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A plurality of media access control drivers are coupled to and provide a respective channel to connect a computer and the switched network. Each media access control driver has a first mode in which a connection is established in the switched network and a second mode in which the local area network protocol is passed over the switched network. The media access control drivers may also be placed in a third and fourth mode which allow communication in an unformatted and non-LAN based protocol. The architecture also includes at least one port connection manager which manages one of the channels when the respective media access control driver is in the first mode and a connection manager to manage a status of the connection. The media access control drivers are coupled to a protocol driver to send messages in the local area network protocol when the media access control drivers are in the second mode. Each of the media access control drivers include a table of parameters which describe the channel and a set of entry points to the channel. A protocol manager catalogs the tables for use by other modules.

Claims

1. A system for enabling a first computer to communicate over a switched network with a second computer located within a local area network connectable to the switched network, the first computer having a media access control driver for providing a communication channel to connect the first computer to the switched network, comprising:

means for placing the media access control driver in a first mode to establish a connection between the first computer and the second computer via the switched network;

means for placing the media access control driver in a second mode in which messages in a protocol of the local area network are passed between the first and second computers over the switched network;

means for managing a status of a connection between the first and second computers; and

means for passing messages in the local area network protocol between the first and second computers when the media access control driver is in the second mode.

2. The system as recited in claim 1 wherein the means for placing the media access control driver in a first mode comprises a port connection manager which manages the communication channel when the media access control driver is in the first mode.

3. The system as recited in claim 2 which further comprises a hardware adapter to physically connect the first computer to the switched network.

4. The system as recited in claim 3 which further comprises:

a second media access control driver for providing a communication channel between the second computer and the switched network;

means for selectively placing the second media access control driver in a first mode in which a connection is established in the switched network or a second mode in which messages in the local area network protocol are passed between the first and second computers over the switched network; and

a second hardware adapter to physically connect the second computer to the switched network.

5. The system as recited in claim 2 wherein the means for placing the media access control driver in a second mode includes the port connection manager.

6. The system as recited in claim 1 which further comprises a hardware adapter to physically connect the first computer to the switched network.

7. The system as recited in claim 6 wherein the hardware adapter is a modem and the switched network is a telephone network.

8. The system as recited in claim 1 wherein the media access control driver includes a table of parameters which describe the channel and a set of entry points to the channel.

9. The system as recited in claim 1 further including means for placing the media access control driver in a third mode in which unformatted data is sent over the switched network.

10. The system as recited in claim 1 further including means for placing the media access control driver in a third mode in which a non-LAN protocol is sent over the switched network.

11. A system for enabling a first computer to communicate over a switched network with a second computer located within a local area network connectable to the switched network, comprising:

a plurality of media access control drivers each for providing a respective communication channel to connect the first computer and the switched network;

a port connection manager for selectively switching at least one of the media access control drivers from a first mode to a second mode, wherein during the first mode the respective media access control driver establishes, takes down or manages a connection between the first computer and the second computer via the switched network, and wherein during the second mode the respective media access control driver passes messages in a protocol of the local area network between the first and second computers over the switched network; and

a connection manager to manage a status of the connection; and

a protocol driver to send messages in the local area network protocol when the respective media access control driver is in the second mode.

12. The system as recited in claim 11 wherein each of the media access control drivers include a table of parameters which describe the channel and a set of entry points to the channel and which further comprises a protocol manager which catalogs the tables.

13. A method for enabling a first computer to communicate over a switched network with a second computer located within a network connectable to the switched network comprising the steps of:

placing a media access control driver in a connection mode to establish a communication channel between the first computer and the switched network;

selectively switching the media access control driver from the connection mode to a protocol mode to facilitate passing of messages in a protocol of the network between the first and second computers over the switched network;

managing the communication channel with a port connection manager when the media access control driver is in the connection mode; and

using the port connection manager to switch the media access control driver between the connection and protocol modes.

14. The method as recited in claim 13 which further comprises the step of managing a status of the connection with a connection manager.

15. The method as recited in claim 13 wherein the media access control driver includes a table of parameters which describe the channel and a set of entry points to the channel.

16. The method as recited in claim 13 which further comprises the steps of:

placing the media access control driver in an unformatted data mode; and

sending unformatted data over the switched network while the media access control driver is in the unformatted data mode.

17. The method as recited in claim 13 which further comprises the steps of:

placing the media access control driver in a non-LAN protocol mode; and

sending data in a non-LAN protocol over the switched network while the media access control driver is in the non-LAN protocol mode.

18. A computer program product for enabling a first computer to communicate over a switched network with a second computer located within a network connectable to the switched network, comprising:

a media access control driver which when resident on the first computer provides a channel to connect the first computer to the switched network;

means for selectively switching the media access control driver from a first mode to a second mode, wherein during the first mode the media access control driver establishes, takes down or manages a connection between the first computer and the second computer via the switched network, and wherein during the second mode the media access control driver passes messages in a protocol of the network between the first and second computers over the switched network;

a port connection manager which manages the channel when the media access control driver is in the first mode; and

a connection manager to manage a status of the connection.

19. The product as recited in claim 18 wherein the port connection manager switches the media access control driver between the first and second modes.

20. The product as recited in claim 18 wherein the media access control driver includes a table of parameters which describe the channel and a set of entry points to the channel.

21. The product as recited in claim 18 wherein the media access control driver couples to a modem and the switched network is a telephone network.

22. The product as recited in claim 18 wherein the media access control driver has a third mode in which unformatted data is sent over the switched network.

23. The product as recited in claim 18 wherein the media access control driver has a third mode in which a non-LAN protocol is sent over the switched network.

24. A method for enabling a first computer to communicate over a switched network with a second computer located within a network connectable to the switched network, the first computer having a media access control driver, comprising the steps of:

establishing a connection between the first and second computer via the switched network;

selectively switching the media access control driver into one of a set of modes in which information is passed between the first and second computers over the switched network, the set of modes including a first mode for handling messages in a protocol of the network, a second mode for handling unformatted data, and a third mode for handling messages in a non-LAN protocol;

passing messages in the protocol of the network between the first and second computers when the media access control driver in switched to the first mode;

passing unformatted data between the first and second computers when the media access control driver is switched to the second mode; and

passing messages in a non-LAN protocol between the first and second computers when the media access control driver is switched to the third mode.