Token ring local area network testing apparatus inserted in an active "T" c o

• US 5,425,017 A
• Filed: 01/11/1993
• Issued: 06/13/1995
• Est. Priority Date: 01/11/1993
• Status: Expired due to Fees

• Current Assignee: Fluke Corporation (Fortive Corp.)
• Original Assignee: Forte Networks Incorporated, Fluke Corporation (Fortive Corp.)
• Inventors: Copley, Mark, Whiteside, Charles H., Wisdom, Thomas S. Jr., Odell, Chris L., Fish, David G., Jensen, Gordon A.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Jung, Min
• Application Number:
  US08/003,239
• Time in Patent Office: 883 Days
• Field of Search: 370/85.4, 370/85.5, 370/13, 370/85.15, 340/825.05
• US Class Current: 370/245
• CPC Class Codes: H04L 12/433 with asynchronous transmission, e.g. token ring, register insertion
• CPC Class Codes: H04L 43/50 Testing arrangements

Abstract

A testing apparatus for token ring local area networks (LANs) which can insert into the token ring network without requiring a separate port on a media access unit (MAU). The testing apparatus of the present invention is connected between a regular network station and the MAU. The testing apparatus is insertable into the network through the MAU, and the regular network station is able to insert into the network through the testing apparatus. Once inserted, the regular network station and the testing apparatus act as separate stations in series on the LAN. Due to its central position in this configuration, the testing apparatus is able to test for possible faults that might be present in the network and/or in the station to which it is connected. In addition, since the testing apparatus does not require a separate port on the MAU, no active user on the network needs to be disconnected for any extended period of time.

Claims

1. A method for inserting a station into a token ring local area network, comprising:

physically connecting a testing apparatus between a station and a media access unit to which at least one other station on the token ring is attached;

inserting said testing apparatus into the token ring, said inserting step includes performing a test to ensure electrical connectivity between said testing apparatus and the media access unit;

attempting to insert the station into the token ring through said testing apparatus;

allowing the station to insert into the token ring when at least one predetermined condition is satisfied.

2. A method for inserting a station into a token ring local area network, comprising:

physically connecting a testing apparatus between a station and a media access unit to which at least one other station on the token ring is attached;

inserting said testing apparatus into the token ring, said inserting step includes determining the speed at which the token ring is operating and said inserting step further includes switching the operating speed of said testing apparatus to match the operating speed of the token ring when said testing apparatus is operating at a different speed from the token ring;

attempting to insert the station into the token ring through said testing apparatus;

allowing the station to insert into the token ring when at least one predetermined condition is satisfied.

3. A method for inserting a station into a token ring local area network, comprising:

physically connecting a testing apparatus between a station and a media access unit to which at least one other station on the token ring is attached;

inserting said testing apparatus into the token ring, said inserting step includes determining whether the token ring is in a beaconing state;

attempting to insert the station into the token ring through said testing apparatus;

allowing the station to insert into the token ring when at least one predetermined condition is satisfied.

4. A method for inserting a station into a token ring local area network, comprising:

physically connecting a testing apparatus between a station and a media access unit to which at least one other station on the token ring is attached;

inserting said testing apparatus into the token ring, said inserting step includes electrically isolating the station from both of said testing apparatus and the media access unit;

attempting to insert the station into the token ring through said testing apparatus;

allowing the station to insert into the token ring when at least one predetermined condition is satisfied.

5. A method for inserting a station into a token ring local area network, comprising:

physically connecting a testing apparatus between a station and a media access unit to which at least one other station on the token ring is attached;

inserting said testing apparatus into the token ring;

attempting to insert the station into the token ring through said testing apparatus, said attempting step includes performing a test to ensure electrical connectivity between said testing apparatus and the station;

allowing the station to insert into the token ring when at least one predetermined condition is satisfied.

6. A method for inserting a station into a token ring local area network, comprising:

physically connecting a testing apparatus between a station and a media access unit to which at least one other station on the token ring is attached;

inserting said testing apparatus into the token ring;

attempting to insert the station into the token ring through said testing apparatus, said attempting step includes determining whether the station and the token ring are operating at the same speed and said attempting step further includes switching the operating speed of said testing apparatus to match the operating speed of the station, when the station and the token ring are not operating at the same speed;

allowing the station to insert into the token ring when at least one predetermined condition is satisfied.

7. A method for inserting a station into a token ring local area network, comprising:

physically connecting a testing apparatus between a station and a media access unit to which at least one other station on the token ring is attached;

inserting said testing apparatus into the token ring;

attempting to insert the station into the token ring through said testing apparatus, said attempting step includes electrically isolating the media access unit from both of said testing apparatus and the station;

allowing the station to insert into the token ring when at least one predetermined condition is satisfied.

8. A method for inserting a station into a token ring local area network, comprising:

physically connecting a testing apparatus between a station and a media access unit to which at least one other station on the token ring is attached;

inserting said testing apparatus into the token ring;

attempting to insert the station into the token ring through said testing apparatus;

allowing the station to insert into the token ring when at least one predetermined condition is satisfied, said allowing step includes electrically connecting the station and said testing apparatus in series with at least one other station on the token ring.

9. A method for inserting a station into a token ring local area network, comprising:

physically connecting a testing apparatus between a station and a media access unit to which at least one other station on the token ring is attached;

inserting said testing apparatus into the token ring;

attempting to insert the station into the token ring through said testing apparatus;

allowing the station to insert into the token ring when at least one predetermined condition is satisfied, said one predetermined condition comprises at least a match in operating speed between the token ring and the station.

10. A testing apparatus for testing a token ring local area network, comprising:

testing means for testing the token ring network for an undesirable state;

first means for communicating between a media access unit of the token ring and said testing means;

second means for communicating between a network station and said testing means; and

wherein said testing means includes;

control means for selectively employing said first and second means to connect said testing means with the station and with the media access unit and for selectively electrically connecting the station with the media access unit;

network interface means for generating and receiving token ring signals communicated through said control means; and

processing means for receiving token ring network related data through said network interface means.

11. An apparatus, as claimed in claim 10, wherein said network interface means comprises:

analog interface means including a transmitter and a receiver;

digital interface means including a transmitter and a receiver; and

multiplexing means operable to connect said analog interface transmitter with at least one of said digital interface receiver and said analog interface receiver and operable to connect said digital interface transmitter with at least one of said analog interface receiver and said digital interface receiver.

12. An apparatus, as claimed in claim 10, wherein:

each of said first and second means includes first and second cables each including at least two pairs of conducting wires.

13. An apparatus, as claimed in claim 10, wherein:

said control means comprises a field programmable gate array and a switching network.

14. An apparatus, as claimed in claim 13, wherein:

said field programmable gate array is operable to cause said switching network to electrically connect said testing apparatus between the station and the media access unit.

15. An apparatus, as claimed in claim 11, wherein:

said control means comprises a field programmable gate array and a switching network, and said field programmable gate array is operable to control said multiplexing means to connect said analog interface transmitter to both said analog interface receiver and said digital interface receiver and said digital interface transmitter to said digital interface receiver.