Distributed network repeater system

• US 7,880,474 B1
• Filed: 07/26/2004
• Issued: 02/01/2011
• Est. Priority Date: 05/27/1999
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Mackay, Gordon
• Primary Examiner(s): Dole; Timothy J
• Application Number:
  US10/899,672
• Time in Patent Office: 2,381 Days
• Field of Search: 324/539, 324/538, 324/691, 324/658, 324/713, 370241-253, 307/89
• US Class Current: 324/539
• CPC Class Codes: H04B 3/60 Systems for communication between relatively movable stations, e.g. for communication with lift H04B3/54 takes precedence
• CPC Class Codes: Y10S 439/955 including electronic identifier or coding means

Abstract

A repeater, useable for connecting switches in a data communication network, is provided in a distributed and/or modular fashion. The repeater includes a plurality of separate and distinct components or modules connected to or at least partially housed in, the various switches which the repeater modules couple. Preferably, the repeater autodetects and/or autoconfigures some or all aspects of repeater operations, such as detecting and/or configuring appropriate full/half-duplex mode operation or detecting and/or configuring in response to appropriate or approved cable-type connections. The distributed and/or modular repeater facilitates accommodating various switching or repeater needs as a network grows or contracts.

Claims

1. A method for use in a system which includes communication over at least a first multi-wire cable, between first and second electronic devices during normal operation of the first and second electronic devices, the method for distinguishing at least a characteristic-of-interest related to the first multi-wire cable, a first end of the first multi-wire cable being coupled, during the normal operation, to a connector in the first electronic device, the method comprising:

detecting, in the first electronic device, at least a first electrical characteristic of a first lead from the connector configured for connection to at least a first conductor of the first multi-wire cable, the first electrical characteristic being different from the characteristic-of-interest related to the first multi-wire cable, wherein the first electronic device is a module of a multi-module network repeater having two or more modules, and wherein the first electrical characteristics of the first lead corresponds to an electrical characteristic provided in the multi-wire cable; and

determining whether the characteristic-of-interest is present in the first multi-wire cable based at least in part upon correlating the detected first electrical characteristic of the first lead with the characteristic-of-interest, wherein the first electrical characteristic acts as a marker for the characteristic-of-interest.

2. The method of claim 1, wherein the first electrical characteristic is detected with respect to a second lead from the connector configured for connection to a second conductor of the multi-wire cable.

3. The method of claim 2, wherein the first electrical characteristic is related to resistance between the first and second leads.

4. The method of claim 3, further comprising connecting the second lead to a known potential in the first electronic device.

5. The method of claim 4, wherein the known potential is a ground potential.

6. The method of claim 3, wherein the first lead is coupled to a device responsive to a potential relative to ground.

7. The method of claim 6, wherein the device responsive to a potential relative to ground includes a software-readable register.

8. The method of claim 3, wherein the first lead is coupled to a pull-up resistor.

9. The method of claim 3, further comprising permitting, in the first electronic device, the normal operations only when the first electrical characteristic is within a predetermined range.

10. The method of claim 9, wherein the first electronic device includes a transmitter and further comprising preventing transmitting signals from the transmitter over the first cable when the first electrical characteristic is not within one or more predetermined ranges.

11. The method of claim 3, further comprising outputting at least a first indicator when the electrical characteristic is not within one or more predetermined ranges.

12. The method as recited in claim 3, wherein the first module includes at least two ports for connections with other modules of the multi-module network repeater, the method further comprising:

determining whether at least two of the at least two ports are coupled to ports of modules of the multi-module network repeater by recognizing or detecting the presence or absence of a predetermined resistance between the first and second leads.

13. The method of claim 2, wherein the first electrical characteristic is related to capacitance between the first and second leads.

14. The method as recited in claim 2, wherein the first module includes at least two ports for connections with other modules of the multi-module network repeater, the method further comprising:

determining whether at least two of the at least two ports are coupled to ports of modules of the multi-module network repeater by recognizing or detecting the presence or absence of a predetermined value of the first electrical characteristic.

15. The method of claim 1, wherein the first electronic device is a network switch.

16. The method as recited in claim 1, wherein the second electronic device is a second module of the multi-module network repeater.

17. The method as recited in claim 1, wherein the characteristic-of-interest is selected from a group consisting of length of the first multi-wire cable, level of conductivity of the first multi-wire cable, level of permissivity of the first multi-wire cable, and combinations thereof.

18. Apparatus for verifying a cable, comprising:

at least a first electronic device;

a connector means in the first electronic device for coupling to a multi-wire cable during normal use of the first electronic device, the multi-wire cable being a verified cable only if a characteristic-of-interest of the cable is within a predetermined range; and

means for detecting, in the first electronic device, at least a first electrical characteristic of a first lead from the connector means, the first lead configured for connection to at least a first conductor of the multi-wire cable, the first electrical characteristic being different from the characteristic-of-interest and the first electrical characteristic corresponding to an electrical characteristic provided in the multi-wire cable, wherein whether the characteristic-of-interest is present in the multi-wire cable is determined based at least in part upon correlating the detected first electrical characteristic of the first lead with the characteristic-of-interest, wherein the first electrical characteristic acts as a marker for the characteristic-of-interest, and wherein the first electronic device is a module of a multi-module network repeater having two or more modules.

19. The apparatus of claim 18, wherein the first electrical characteristic is related to capacitance between the first lead and a second lead from the connector means.

20. The apparatus as recited in claim 18, wherein the first electrical characteristic is detected with respect to a second lead from the connector, the second lead configured for connection to a second conductor of the multi-wire cable.

21. The apparatus as recited in claim 20, wherein the first electrical characteristic is related to resistance between the first and second leads.

22. Apparatus for use in a system which includes communication over at least a first multi-wire cable, between first and second electronic devices during normal operation of the first and second electronic devices, the apparatus for distinguishing at least a characteristic-of-interest related to the cable, a first end of the first multi-wire cable being coupled, during the normal operation, to a connector in the first electronic device, comprising:

at least a first pull-up resistor coupled to a first lead from the connector, the first lead configured for connection to a first conductor of the multi-wire cable; and

a connector to ground coupled to a second lead from the connector, the second lead configured for connection to a second conductor of the multi-wire cable;

wherein there is a finite, non-zero resistance between first and second wires of the multi-wire cable;

wherein the pull-up resistor has a resistance substantially greater than the finite non-zero resistance;

wherein whether the characteristic-of-interest related to the cable is present in the cable is determined based at least in part upon correlating a detected electrical characteristic of the first lead with the characteristic-of-interest, wherein the first electrical characteristic acts as a marker for the characteristic-of-interest and; and

wherein the first and second electronic devices are modules of a multi-module network repeater having two or more modules, and

wherein the detected electrical characteristic of the first lead corresponds to an electrical characteristic provided in the multi-wire cable.

23. Apparatus, in a first electronic device, the first electronic device configured with a coupler for coupling to a multi-wire cable, for communicating over the multi-wire cable with a second electronic device, the coupler providing a first lead coupleable to a first wire of the multi-wire cable, the apparatus usable for distinguishing at least a characteristic-of-interest of the cable, comprising:

circuitry, in the first electronic device, coupled to the first lead, wherein the circuitry detects at least a first electrical characteristic of the first lead during at least a first period while the multi-wire cable is coupled to the coupler and determines whether the characteristic-of-interest is present in the multi-wire cable based at least in part upon correlating the detected first electrical characteristic of the first lead with the characteristic-of-interest, wherein the first electrical characteristic acts as a marker for the characteristic-of-interest, and wherein the first electronic device is a module of a multi-module network repeater having two or more modules, and wherein the detected first electrical characteristic of the first lead corresponds to an electrical characteristic provided in the multi-wire cable.

24. The apparatus of claim 23, the coupler further providing a second lead coupleable to a second wire of the multi-wire cable, wherein the first electrical characteristic is related to capacitance between the first lead and the second lead.