System and method for communicating asynchronous transfer mode cells in a network environment

• US 7,136,384 B1
• Filed: 03/19/2002
• Issued: 11/14/2006
• Est. Priority Date: 03/19/2002
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Wang, Li T.
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): LY, ANH VU H
• Application Number:
  US10/103,397
• Time in Patent Office: 1,701 Days
• Field of Search: None
• US Class Current: 370/395.1
• CPC Class Codes: H04L 12/5601 Transfer mode dependent, e.g. ATM
• CPC Class Codes: H04L 2012/5652 Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
• CPC Class Codes: H04L 2012/5665 Interaction of ATM with other protocols
• CPC Class Codes: H04L 2012/5667 IP over ATM
• CPC Class Codes: H04L 2012/5671 Support of voice

Abstract

A method for communicating data is provided that includes receiving an asynchronous transfer mode (ATM) cell at a line card and generating an Ethernet frame that comprises the received ATM cell, an Ethernet-compatible header, and a data integrity element. The Ethernet frame is communicated to a first destination. The Ethernet frame is received at the first destination and directed to a second destination. At the second destination, the Ethernet frame is segmented into portions and reassembled in order to form an Ethernet packet. The Ethernet packet is then communicated to the first destination.

Claims

1. An apparatus for communicating data, the apparatus comprising:

a line card operable to receive one or more asynchronous transfer mode (ATM) cells, the line card including;

an Ethernet encapsulator operable to generate one or more Ethernet frames that each comprise one of the ATM cells received by the line card, an Ethernet-compatible header, and a data integrity element, wherein the line card is operable to communicate one or more of Ethernet frames to a network interface, and wherein the network interface comprises an Ethernet switch operable to receive and to direct one or more of the Ethernet frames;

a segmentation and reassembly (SAR) element coupled to the network interface and operable to receive one or more of the Ethernet frames communicated by the Ethernet switch, wherein the SAR element is operable to segment one or more of the Ethernet frames into portions and to reassemble one or more of the portions in order to generate one or more Ethernet packets, the SAR element communicating one or more of the Ethernet packets to the Ethernet switch; and

wherein the SAR element includes a unique MAC address, said unique MAC address identifies the SAR element and allows SAR element to receive data directed by other network equipments.

2. The apparatus of claim 1, wherein one or more of the ATM cells comprise voice data, and wherein the Ethernet switch is operable to direct the voice data to a voice element, the voice element being coupled to the network interface and operable to process the voice data.

3. The apparatus of claim 2, further comprising a voice gateway operable to receive the voice data from the voice element.

4. The apparatus of claim 1, further comprising a backplane operable to provide a communicative interface between the network interface, the line card, and the SAR element.

5. The apparatus of claim 4, wherein the backplane is configured to communicate information in an Ethernet format.

6. A method for communicating data, comprising:

receiving an asynchronous transfer mode (ATM) cell at a line card;

generating an Ethernet frame that comprises the received ATM cell, an Ethernet-compatible header, and a data integrity element;

communicating the Ethernet frame to a first destination;

receiving the Ethernet frame at the first destination and directing the Ethernet frame to a second destination;

segmenting the Ethernet frame into portions at the second destination and reassembling the portions in order to form an Ethernet packet; and

communicating the Ethernet packet to the first destination;

wherein the second destination is a segmentation and reassembly (SAR) element and wherein said SAR element includes a unique MAC address, said unique MAC address identifies the SAR element and allows SAR element to receive data directed by other network equipments.

7. The method of claim 6, further comprising communicating voice data to a voice element that processes the voice data, wherein the ATM cell comprises the voice data.

8. The method of claim 7, further comprising receiving the voice data from the voice element at a voice gateway.

9. The method of claim 6, further comprising providing a communicative interface between the line card, the first destination, and the second destination.

10. The method of claim 9, wherein the communicative interface is configured to communicate information in an Ethernet format.

11. A digital subscriber line access multiplexer (DSLAM), comprising:

a network interface including an Ethernet switch;

one or more line cards each operable to receive an ATM cell, each of the line cards including;

an Ethernet encapsulator operable to generate an Ethernet frame that comprises the ATM cell, an Ethernet-compatible header, and a data integrity element, wherein each of the line cards is operable to communicate the Ethernet frame to the Ethernet switch; and

a segmentation and reassembly (SAR) element coupled to the network interface and operable to receive the Ethernet frame communicated by the Ethernet switch, wherein the SAR element is operable to segment the Ethernet frame into portions and to reassemble the portions in order to generate an Ethernet packet, the SAR element communicating the Ethernet packet to the Ethernet switch; and

wherein the SAR element includes a unique MAC address, said unique MAC address identifies the SAR element and allows SAR element to receive data directed by other network equipments.

12. The DSLAM of claim 11, wherein the ATM cell comprises voice data, and wherein the Ethernet switch is operable to direct the voice data to a voice element, the voice element being coupled to the network interface and operable to process the voice data.

13. The DSLAM of claim 12, further comprising a voice gateway operable to receive the voice data from the voice element.

14. The DSLAM of claim 11, further comprising a backplane operable to provide a communicative interface for the line cards, the network interface, and the SAR element.

15. The DSLAM of claim 14, wherein the backplane is configured to communicate information in an Ethernet format.

16. A system for communicating data, comprising:

means for receiving an asynchronous transfer mode (ATM) cell;

means for generating an Ethernet frame that comprises the received ATM cell, an Ethernet-compatible header, and a data integrity element;

means for communicating the Ethernet frame to a first destination;

means for receiving the Ethernet frame at the first destination and for directing the Ethernet frame to a second destination;

means for segmenting the Ethernet frame into portions and for reassembling the portions in order to generate an Ethernet packet; and

means for communicating the Ethernet packet to the first destination;

wherein the second destination is a segmentation and reassembly (SAR) element and wherein said SAR element includes a unique MAC address, said unique MAC address identifies the SAR element and allows SAR element to receive data directed by other network equipments.

17. The system of claim 16, further comprising means for communicating voice data to a voice element that processes the voice data, wherein the ATM cell comprises the voice data.

18. The system of claim 17, further comprising means for receiving the voice data from the voice element.

19. The system of claim 16, further comprising means for providing a communicative interface between the first and second destinations.

20. The system of claim 19, wherein the means for providing the communicative interface is configured to communicate information in an Ethernet format.

21. A computer readable medium having instructions embodied thereon that when executed by a processor causes the processor to perform operations comprising:

receive an asynchronous transfer mode (ATM) cell;

generate an Ethernet frame that comprises the received ATM cell, an Ethernet-compatible header, and a data integrity element;

communicate the Ethernet frame to a first destination;

receive the Ethernet frame at the first destination and direct the Ethernet frame to a second destination;

segment the Ethernet frame into portions and reassemble the portions in order to form an Ethernet packet; and

communicate the Ethernet packet to the first destination;

wherein the second destination is a segmentation and reassembly (SAR) element and wherein said SAR element includes a unique MAC address, said unique MAC address identifies the SAR element and allows SAR element to receive data directed by other network equipments.

22. The computer readable medium of claim 21, further operable to communicate voice data to a voice element that processes the voice data, wherein the ATM cell comprises the voice data.

23. The computer readable medium claim 22, further operable to receive the voice data from the voice element.

24. The computer readable medium claim 21, further operable to provide a communicative interface between the first and second destinations.

25. The computer readable medium claim 24, wherein the software is configured to communicate information in an Ethernet format.