Apparatus and method for fibre channel distance extension embedded within an optical transport system

• US 7,782,778 B2
• Filed: 12/08/2004
• Issued: 08/24/2010
• Est. Priority Date: 12/24/2002
• Status: Active Grant

• Current Assignee: Xylon LLC (Intellectual Ventures LLC)
• Original Assignee: Pivotal Decisions LLC (Intellectual Ventures LLC)
• Inventors: Sheth, Samir Satish, Hughey, Richard Thomas, Moore, Tom, Cox, Jeffrey Lloyd, Hawkins, Kelly, Royal, Brian
• Primary Examiner(s): NGUYEN, HANH N
• Application Number:
  US11/006,939
• Publication Number:
  US 20050163168A1
• Time in Patent Office: 2,085 Days
• Field of Search: 370/400, 370/401, 370/410, 370/412, 370/468, 370/470, 370/472, 370/473, 370/528, 370/395.5, 370/535, 370/538, 370/537, 370/230, 370/231, 370/232, 370/233, 370/234, 370/235, 370/413, 370/238, 370/395.1, 709/225, 709/226, 709/228
• US Class Current: 370/235
• CPC Class Codes: H04J 3/04 Distributors combined with modulators or demodulators pulse distributors in general H03K5/15; pulse counters H03K21/00 - H03K29/06; for telegraphy H04L5/22, H04L13/00 - H04L23/00, H04L25/45; for telephony H04Q11/04
• CPC Class Codes: H04J 3/07 using pulse stuffing for systems with different or fluctuating information rates or bit rates
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/245 Link aggregation, e.g. trunking
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/26 using explicit feedback to the source, e.g. choke packets
• CPC Class Codes: H04L 47/267 sent by the destination endpoint network streaming of media packets with control of the source by the destination H04L65/613
• CPC Class Codes: H04L 47/30 in combination with information about buffer occupancy at either end or at transit nodes
• CPC Class Codes: H04L 49/30 Peripheral units, e.g. input or output ports
• CPC Class Codes: H04L 49/356 for storage area networks
• CPC Class Codes: H04L 49/357 Fibre channel switches
• CPC Class Codes: H04L 49/557 Error correction, e.g. fault recovery or fault tolerance
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

This invention provides an apparatus and method to aggregate individual fiber channel data streams in their native mode and to extend connectivity of fiber channel storage area networks across wide geographical distances over a high-speed data channel with forward error correction.

Claims

1. A system for controlling a flow of data over an optical transport system, the system comprising:

an ingress terminal in communication with a first network, wherein the ingress terminal is configured to receive the data from the first network; and

an egress terminal in communication with the ingress terminal comprising a memory, wherein the egress terminal is configured to receive the data from the ingress terminal over the optical transport system and transmit the data to a second network, and wherein said memory is configured to store the data received by the egress terminal from the ingress terminal;

wherein the ingress terminal is configured to enable transmission of the data from the first network to the ingress terminal only when the memory is available to store the data,

wherein the ingress terminal is configured to determine memory availability based, at least in part, on a data amount transmitted by the ingress terminal to the egress terminal.

2. The system of claim 1, wherein the ingress terminal comprises an ingress circuit and an egress circuit.

3. The system of claim 2, wherein the egress circuit is configured to receive a first message from the egress terminal indicating an amount of available storage space in the memory, and wherein the egress circuit is further configured to record the amount of available storage space as a variable.

4. The system of claim 3, wherein the ingress circuit is configured to transmit a signal to the egress circuit indicating a data quantity transmitted from the ingress terminal to the egress terminal.

5. The system of claim 4, wherein the egress circuit is configured to update the variable based on the transmitted data quantity.

6. The system of claim 5, wherein the variable update includes decrementing the amount of available storage space to reflect the transmitted data quantity.

7. The system of claim 3, wherein the egress circuit is configured to receive a second message from the egress terminal indicating a data quantity transmitted from the egress terminal to the second network.

8. The system of claim 7, wherein the egress circuit is configured to update the variable based on the transmitted data quantity.

9. The system of claim 8, wherein the variable update includes incrementing the amount of available storage space to reflect the transmitted data quantity.

10. The system of claim 1, wherein the egress terminal comprises an egress circuit and an ingress circuit.

11. The system of claim 10, wherein the ingress circuit is configured to detect a number of buffer credits available at the second network and to transmit a signal to the egress circuit indicating the number of available buffer credits, and

wherein the egress circuit is configured to store the number of available buffer credits as a variable.

12. The system of claim 11, wherein the egress circuit is configured to update the variable based on a data quantity transmitted from the egress terminal to the second network.

13. The system of claim 12, wherein the variable update includes decrementing the number of available buffer credits to reflect the transmitted data quantity.

14. The system of claim 12, wherein the egress circuit is configured to update the variable based on an acknowledgement that the second network received the transmitted data quantity.

15. The system of claim 14, wherein the variable update includes incrementing the number of available buffer credits to reflect the received transmitted data quantity.

16. The system of claim 1, wherein the ingress terminal is configured to cause the first network to cease transmitting the data if the memory is not available to store the data.

17. The system of claim 1, wherein the data from the first network comprises a first packet-based data stream and a second packet-based data stream, and

wherein the first packet-based data stream comprises a first data rate and the second packet-based data stream comprises a second data rate.

18. The system of claim 17, wherein the first data rate is different than the second data rate.

19. The system of claim 17, wherein the ingress terminal is configured to aggregate the first and second packet-based data streams into a composite packet-based data stream having a third data rate.

20. The system of claim 1, wherein the first and second networks each comprise a respective storage area network.

21. The system of claim 1, wherein the memory comprises static random access memory.

22. The system of claim 21, wherein the static random access memory includes four banks to accommodate a plurality of data formats.

23. The system of claim 1, wherein an interface between the first network and the ingress terminal comprises a Fibre Channel standard protocol.

24. The system of claim 1, wherein the ingress terminal and the egress terminal are each configured to be separated by a geographical distance of up to approximately 6,000 km.

25. A method for controlling a flow of data over an optical transport system, the method comprising:

determining whether a memory in an egress terminal is available to store the data received by the egress terminal based at least in part on a data amount transmitted to the egress terminal;

allowing transmission of the data from a first network to an ingress terminal only when the memory is available to store the data;

receiving the data from the first network; and

transmitting the data over the optical transport system from the ingress terminal to the egress terminal.

26. The method of claim 25, further comprising receiving a message from the egress terminal indicating an amount of available storage space in the memory and recording the amount of available storage space as a variable.

27. The method of claim 26, further comprising updating the variable based on a data quantity transmitted to the egress terminal.

28. The method of claim 27, wherein updating the variable comprises decrementing the amount of available storage space to reflect the transmitted data quantity.

29. The method of claim 25, further comprising:

receiving a first message from the egress terminal indicating an amount of available storage space in the memory;

recording the amount of available storage space as a variable; and

receiving a second message from the egress terminal indicating a data quantity transmitted from the egress terminal to a second network.

30. The method of claim 29, further comprising updating the variable based on the transmitted data quantity.

31. The method of claim 30, wherein updating the variable includes incrementing the amount of available storage space to reflect the transmitted data quantity.

32. The method of claim 25, further comprising receiving the data at the egress terminal and transmitting the data to a second network.

33. The method of claim 32, further comprising detecting a number of buffer credits available at the second network and storing the number of available buffer credits as a variable.

34. The method of claim 33, further comprising updating the variable based on a data quantity transmitted from the egress terminal to the second network.

35. The method of claim 34, wherein updating the variable includes decrementing the number of available buffer credits to reflect the transmitted data quantity.

36. The method of claim 34, further comprising updating the variable based on an acknowledgement that the second network received the transmitted data quantity.

37. The method of claim 36, wherein updating the variable includes incrementing the number of available buffer credits to reflect the received transmitted data quantity.

38. The method of claim 25, further comprising causing the first network to cease transmitting the data if the memory is not available to store the data.

39. The method of claim 25, wherein the data from the first network comprises a first packet-based data stream and a second packet-based data stream, and

wherein the first packet-based data stream comprises a first data rate and the second packet-based data stream comprises a second data rate.

40. The method of claim 39, wherein the first data rate is different than the second data rate.

41. The method of claim 39, further comprising aggregating the first and second packet-based data streams into a composite packet-based data stream having a third data rate.

42. The method of claim 25, wherein the first network comprises a storage area network.

43. The method of claim 25, wherein the memory comprises static random access memory.

44. The method of claim 43, wherein the static random access memory includes four banks to accommodate a plurality of data formats.

45. The method of claim 25, wherein the data from the first network comprises a data format defined by a Fibre Channel standard protocol.

46. An apparatus for controlling a flow of data over an optical transport system, the apparatus comprising:

an ingress block in communication with a first network, wherein the ingress block is configured to receive the data from the first network and to transmit the data to an egress terminal over the optical transport system; and

an egress block in communication with the ingress block and the first network comprising a memory, wherein the egress block is configured to allow the first network to transmit the data to the ingress block only when the memory of the egress terminal is available to store the data, wherein said memory is configured to store data received by said egress block, and

wherein the egress block is configured to determine memory availability based, at least in part, on a data amount transmitted by the ingress block to the egress terminal.

47. The apparatus of claim 46, wherein the egress block is configured to receive a message from the egress terminal indicating an amount of available storage space in the memory and to record the amount of available storage space as a variable.

48. The apparatus of claim 47, wherein the egress block is configured to update the variable based on a data quantity transmitted from the ingress block to the egress terminal.

49. The apparatus of claim 48, wherein the variable update includes decrementing the amount of available storage space to reflect the transmitted data quantity.

50. The apparatus of claim 46, wherein the egress block is configured to receive a message from the egress terminal indicating a data quantity transmitted from the egress terminal to a second network.

51. The apparatus of claim 50, wherein the egress block is configured to update the variable based on the transmitted data quantity.

52. The apparatus of claim 51, wherein the variable update includes incrementing the amount of available storage space to reflect the transmitted data quantity.

53. The apparatus of claim 46, wherein the egress block is configured to cause the first network to cease transmitting the data if the memory is not available to store the data.

54. The apparatus of claim 46, wherein the data from the first network comprises a first packet-based data stream and a second packet-based data stream, and

wherein the first packet-based data stream comprises a first data rate and the second packet-based data stream comprises a second data rate.

55. The apparatus of claim 54, wherein the first data rate is different than the second data rate.

56. The apparatus of claim 54, wherein the ingress block is configured to aggregate the first and second packet-based data streams in a native mode into a composite packet-based data stream having a third data rate.

57. The apparatus of claim 46, wherein the first network comprises a storage area network.

58. The apparatus of claim 46, wherein the memory comprises static random access memory.

59. The apparatus of claim 58, wherein the static random access memory is separated into four banks to accommodate a plurality of data formats.

60. The apparatus of claim 46, wherein an interface between the first network and the ingress block comprises a Fibre Channel standard protocol.

61. The apparatus of claim 46, wherein the ingress block and the egress terminal are each configured to be separated by a geographical distance of up to approximately 6,000 km.

62. An apparatus for controlling a flow of data over an optical transport system, the apparatus comprising:

an ingress block in communication with an ingress terminal via the optical transport system and with a first network; and

an egress block comprising a memory, wherein the egress block is in communication with the first network, with the optical transport system, and with the ingress block, wherein the egress block is configured to receive the data from an ingress terminal over the optical transport system, to store the received data in the memory, and to transmit the received data to the first network;

wherein the apparatus is configured to notify the ingress terminal as to an amount of available storage space in the memory by communicating the amount of available storage space from the egress block to the ingress block followed by communicating the amount of available storage space from the ingress block to the ingress terminal via the optical transport system.

63. The apparatus of claim 62, wherein the ingress block is configured to detect a number of buffer credits available at the first network and to transmit a signal to the egress block indicating the number of available buffer credits.

64. The apparatus of claim 63, wherein the egress block is configured to store the number of available buffer credits as a variable.

65. The apparatus of claim 64, wherein the egress block is configured to update the variable based on a data quantity transmitted to the first network.

66. The apparatus of claim 65, wherein the variable update includes decrementing the number of available buffer credits to reflect the transmitted data quantity.

67. The apparatus of claim 65, wherein the egress block is configured to update the variable based on an acknowledgement that the first network received the transmitted data quantity.

68. The apparatus of claim 67, wherein the variable update includes incrementing the number of available buffer credits to reflect the received transmitted data quantity.

69. The apparatus of claim 62, wherein the notification to the ingress terminal as to the amount of available storage space in the memory is used to determine whether a second network is allowed to transmit additional data to the ingress terminal.

70. The apparatus of claim 62, wherein the data from the ingress terminal comprises a composite packet-based data stream having a first data rate.

71. The apparatus of claim 70, wherein the composite packet-based data stream comprises a first packet-based data stream and a second packet-based data stream, and

wherein the first packet-based data stream comprises a second data rate and the second packet-based data stream comprises a third data rate.

72. The apparatus of claim 71, wherein the second data rate is different than the third data rate.

73. The apparatus of claim 62, wherein the first network comprises a storage area network.

74. The apparatus of claim 62, wherein the memory comprises static random access memory.

75. The apparatus of claim 74, wherein the static random access memory is separated into four banks to accommodate a plurality of data formats.

76. The apparatus of claim 62, wherein an interface between the first network and the egress block comprises a Fibre Channel standard protocol.

77. The apparatus of claim 62, wherein the egress block and the ingress terminal are each configured to be separated by a geographical distance of up to approximately 6,000 km.

78. A system for controlling a flow of data over an optical transport system, the system comprising:

an ingress means comprising means for receiving the data from a first network; and

an egress means comprising means for receiving the data from the ingress means over the optical transport system and for transmitting the data to a second network, and comprising a memory means for storing the data received by the egress means from the ingress means;

wherein the ingress means further comprises means for enabling transmission of the data from the first network to the ingress terminal only when the memory means is available to store the data, and

wherein the ingress means further comprises means for determining memory availability based, at least in part, on a data amount transmitted by the ingress means to the egress means.

79. The system of claim 78, wherein the ingress means further comprises means for receiving a first message from the egress means indicating an amount of available storage space in the memory means, and

wherein the ingress means further comprises means for recording the amount of available storage space as a variable.

80. The system of claim 79, wherein the ingress means further comprises means for updating the variable based on a data quantity transmitted from the ingress means to the egress means.

81. The system of claim 80, wherein the variable update includes decrementing the amount of available storage space to reflect the transmitted data quantity.

82. The system of claim 79, wherein the ingress means further comprises means for receiving a second message from the egress means indicating a data quantity transmitted from the egress means to the second network.

83. The system of claim 82, wherein the ingress means further comprises means for updating the variable based on the transmitted data quantity.

84. The system of claim 83, wherein the variable update includes incrementing the amount of available storage space to reflect the transmitted data quantity.

85. The system of claim 78, wherein the egress means further comprises means for detecting a number of buffer credits available at the second network and for transmitting a signal to the ingress means indicating the number of available buffer credits, and

wherein the egress means further comprises means for storing the number of available buffer credits as a variable.

86. The system of claim 85, wherein the egress means further comprises means for updating the variable based on a data quantity transmitted from the egress means to the second network.

87. The system of claim 86, wherein the variable update includes decrementing the number of available buffer credits to reflect the transmitted data quantity.

88. The system of claim 85, wherein the egress means further comprises means for updating the variable based on an acknowledgement that the second network received the transmitted data quantity.

89. The system of claim 88, wherein the variable update includes incrementing the number of available buffer credits to reflect the received transmitted data quantity.

90. The system of claim 78, wherein the ingress means further comprises means for causing the first network to cease transmitting the data if the memory means is not available to store the data.

91. The system of claim 78, wherein the data from the first network comprises a first packet-based data stream and a second packet-based data stream, and

wherein the first packet-based data stream comprises a first data rate and the second packet-based data stream comprises a second data rate.

92. The system of claim 91, wherein the first data rate is different than the second data rate.

93. The system of claim 91, wherein the ingress means further comprises means for aggregating the first and second packet-based data streams into a composite packet-based data stream having a third data rate.

94. The system of claim 78, wherein the first and second networks each comprise a respective storage area network.

95. The system of claim 78, wherein the memory means includes four banks to accommodate a plurality of data formats.

96. The system of claim 78, wherein an interface between the first network and the ingress means comprises a Fibre Channel standard protocol.

97. The system of claim 78, wherein the ingress means and the egress means are each configured to be separated by a geographical distance of up to approximately 6,000 km.