Dual-port ethernet traffic management for protocol conversion

• US 8,582,581 B2
• Filed: 08/19/2011
• Issued: 11/12/2013
• Est. Priority Date: 09/28/2010
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Cooper Technologies Company (Eaton Corporation PLC.)
• Inventors: Kletti, Daniel Rian
• Primary Examiner(s): Chung, Hoon J
• Application Number:
  US13/213,701
• Publication Number:
  US 20120076156A1
• Time in Patent Office: 816 Days
• Field of Search: 370/395.5, 370/395.51, 370/395.52, 370/395.53, 370465-473
• US Class Current: 370/395.5
• CPC Class Codes: H04L 49/351 for local area network [LAN], e.g. Ethernet switches
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 69/32 Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level

Abstract

At least two communications cards are utilized to communicate with at least two Ethernet ports, each having unique MAC and IP addresses, and at least two different protocols. At least two central processing units (CPUs) are coupled to the at least two communications cards through a manageable Ethernet switch. One of the at least two CPUs is a primary (main) CPU and is capable of communicating using a limited number of native Ethernet protocols. Another one or more of the at least two CPUs is dedicated to performing conversion of additional, more complicated protocols to be sent to the primary CPU in at least one of its native Ethernet protocols. This off-loads the primary CPU from having to handle these additional, complicated protocols, thereby reducing the amount of protocol software/firmware required to be integrated with the primary CPU with a subsequent savings in boot-up time and background software overhead.

Claims

1. An apparatus with Ethernet traffic management for protocol conversion, said apparatus comprising:

a primary central processing unit (CPU) having first and second Ethernet interfaces;

a protocol translation CPU having third and fourth Ethernet interfaces;

first and second Ethernet communications interfaces;

a manageable Ethernet switch having

first and second ports coupled to the first and second Ethernet interfaces of the primary CPU, respectively,

third and fourth ports coupled to the third and fourth Ethernet interfaces of the protocol translation CPU, respectively, and

fifth and sixth ports coupled to the first and second Ethernet communications interfaces, respectively;

wherein

Ethernet traffic having a protocol recognized by the primary CPU is routed between the first or second Ethernet communications interfaces and the first or second Ethernet interfaces of the primary CPU by the manageable Ethernet switch, and

Ethernet traffic not having a protocol recognized by the primary CPU is routed between the first or second Ethernet communications interfaces and the protocol translation CPU by the manageable Ethernet switch, whereby the protocol translation CPU converts the Ethernet traffic having the unrecognized protocol to Ethernet traffic having the recognized protocol and then sending the recognized protocol converted Ethernet traffic to the primary CPU.

2. The apparatus according to claim 1, wherein any one or more of the first, second, third and fourth Ethernet interfaces is selected from the group consisting of a media independent interface (MII), a 4-wire interface, a reduced media independent interface (RMII), and a gigabit media independent interface (GMII).

3. The apparatus according to claim 1, wherein the first Ethernet communications interface is a wired Ethernet interface having an RJ45 connector.

4. The apparatus according to claim 1, wherein the second Ethernet communications interface is a wired Ethernet interface having an RJ45 connector.

5. The apparatus according to claim 1, wherein the first Ethernet communications interface is a fiber optic Ethernet interface having a connector adapted for coupling to a fiber optic cable.

6. The apparatus according to claim 1, wherein the second Ethernet communications interface is a fiber optic Ethernet interface having a connector adapted for coupling to a fiber optic cable.

7. The apparatus according to claim 1, wherein the first and second Ethernet communications interfaces have unique MAC and IP addresses.

8. The apparatus according to claim 1, wherein the first, second, third and fourth Ethernet interfaces have unique MAC and IP addresses.

9. The apparatus according to claim 1, further comprising first and second Ethernet communications connectors between the first and second ports of the manageable Ethernet switch and the first and second Ethernet communications interfaces, respectively.

10. The apparatus according to claim 9, wherein the first and second Ethernet communications interfaces are interchangeable and selected from the group consisting of a wired Ethernet interface having an RJ45 connector and a fiber optic Ethernet interface having a connector adapted for coupling to a fiber optic cable.

11. An apparatus with Ethernet traffic management for protocol conversion, said apparatus comprising:

a primary central processing unit (CPU) having first and second Ethernet interfaces;

a protocol translation CPU having third and fourth Ethernet interfaces;

first and second Ethernet communications interfaces;

an analog switch having first and second positions, wherein a common of the analog switch is coupled to the first Ethernet communications interface;

a manageable Ethernet switch having

a first port coupled to the first Ethernet interface of the primary CPU,

a second port coupled to the second Ethernet interface of the primary CPU,

third and fourth ports coupled to the third and fourth Ethernet interfaces of the protocol translation CPU, respectively,

a sixth port coupled to the second Ethernet communications interface,

a fifth port coupled to the first position of the analog switch, and

a seventh port coupled to the second position of the analog switch;

wherein

Ethernet traffic having a protocol recognized by the primary CPU is routed between the second Ethernet communications interface and the first Ethernet interface of the primary CPU by the manageable Ethernet switch when the analog switch is in the first position,

Ethernet traffic not having a protocol recognized by the primary CPU is routed between the second Ethernet communications interface and the protocol translation CPU by the manageable Ethernet switch, whereby the protocol translation CPU converts the Ethernet traffic having the unrecognized protocol to Ethernet traffic having the recognized protocol and then sending the recognized protocol converted Ethernet traffic to the primary CPU over the first Ethernet interface; and

the first Ethernet communications interface is coupled to the fifth port of the manageable Ethernet switch when the analog switch is in the first position and to the seventh port of the manageable Ethernet switch when the analog switch is in the second position.

12. The apparatus according to claim 11, wherein when the analog switch is in the second position the first Ethernet communications interface is coupled to the second Ethernet interface of the primary CPU through the manageable Ethernet switch.

13. The apparatus according to claim 12, wherein the first Ethernet communications interface is coupled to the second Ethernet interface of the primary CPU for IEC61850 GOOSE messaging.

14. The apparatus according to claim 13, wherein the first and second Ethernet communications interfaces are interchangeable and selected from the group consisting of a wired Ethernet interface having an RJ45 connector and a fiber optic Ethernet interface having a connector adapted for coupling to a fiber optic cable.

15. The apparatus according to claim 11, wherein the protocol translation CPU controls the analog switch.

16. The apparatus according to claim 11, wherein the primary CPU controls the analog switch.

17. The apparatus according to claim 11, wherein any one or more of the first, second, third and fourth Ethernet interfaces is selected from the group consisting of a media independent interface (MII), a 4-wire interface, a reduced media independent interface (RMII), and a gigabit media independent interface (GMII).

18. The apparatus according to claim 11, wherein the first Ethernet communications interface is a wired Ethernet interface having an RJ45 connector.

19. The apparatus according to claim 11, wherein the second Ethernet communications interface is a wired Ethernet interface having an RJ45 connector.

20. The apparatus according to claim 11, wherein the first Ethernet communications interface is a fiber optic Ethernet interface having a connector adapted for coupling to a fiber optic cable.

21. The apparatus according to claim 11, wherein the second Ethernet communications interface is a fiber optic Ethernet interface having a connector adapted for coupling to a fiber optic cable.

22. The apparatus according to claim 11, wherein the first and second Ethernet communications interfaces have unique MAC and IP addresses.

23. The apparatus according to claim 11, wherein the first, second, third and fourth Ethernet interfaces have unique MAC and IP addresses.

24. The apparatus according to claim 11, further comprising first and second Ethernet communications connectors between the first and second ports of the manageable Ethernet switch and the first and second Ethernet communications interfaces, respectively.

25. The apparatus according to claim 11, further comprising at least one serial communications switch coupled between at least one serial communications interface, and at least one serial communications port of the primary CPU and the protocol translation CPU, wherein the at least one serial communications switch couples the at least one serial communications interface to either the at least one serial communications port of the primary CPU or the at least one serial communications port of the protocol translation CPU.

26. A method for Ethernet traffic management and protocol conversion, said method comprising the steps of:

coupling first and second Ethernet communications interfaces to a manageable Ethernet switch;

determining with the manageable Ethernet switch whether Ethernet traffic from the first or the second Ethernet communications interfaces has a protocol recognized by a primary CPU;

routing the Ethernet traffic having the protocol recognized by the primary CPU to the primary CPU with the manageable Ethernet switch;

routing the Ethernet traffic not having the protocol recognized by the primary CPU to a protocol translation CPU for translating the unrecognized protocol to the protocol recognized by the primary CPU with the manageable Ethernet switch; and

routing the translated Ethernet traffic from the protocol translation CPU to the primary CPU with the manageable Ethernet switch.

27. The method according to claim 26, further comprising the primary CPU having two ports coupled to first and second ports of the manageable Ethernet switch, wherein the two ports of the primary CPU have unique MAC and IP addresses.

28. The method according to claim 27, further comprising the protocol translation CPU having two ports coupled to third and fourth ports of the manageable Ethernet switch, wherein the two ports of the protocol translation CPU have unique MAC and IP addresses.

29. The method according to claim 28, wherein the first Ethernet communications interface is coupled to a fifth port of the manageable Ethernet switch, and the second Ethernet communications interface is coupled to a sixth port of the manageable Ethernet switch.

30. The method according to claim 29, further comprising the step of:

switching the first Ethernet communications interface between the fifth port of the manageable Ethernet switch and a seventh port of the manageable Ethernet switch,

wherein

when the first Ethernet communications interface is coupled to the fifth port of the manageable Ethernet switch the Ethernet traffic from the first Ethernet communications interface is coupled to one of the two ports of the primary CPU or to one of the two ports of the protocol translation CPU, and

when the first Ethernet communications interface is coupled to the seventh port of the manageable Ethernet switch the Ethernet traffic from the first Ethernet communications interface is coupled to the other one of the two ports of the primary CPU only.