Synchronization system and method

• US 7,710,980 B2
• Filed: 08/20/2007
• Issued: 05/04/2010
• Est. Priority Date: 05/17/2000
• Status: Expired due to Fees

• Current Assignee: Juniper Networks Incorporated
• Original Assignee: Juniper Networks Incorporated
• Inventors: Shimanuki, Tomoharu, Shiraishi, Ken
• Primary Examiner(s): Ngo; Ricky
• Assistant Examiner(s): NG, CHRISTINE Y
• Application Number:
  US11/842,122
• Publication Number:
  US 20080043753A1
• Time in Patent Office: 988 Days
• Field of Search: 370/216, 370/217, 370/218, 370/219, 370/220, 370/221, 370/395.1, 370/395.6, 370/465, 370/466, 370/469, 370/473, 370/474, 370/503
• US Class Current: 370/395.6
• CPC Class Codes: H04L 12/2854 Wide area networks, e.g. public data networks
• CPC Class Codes: H04L 12/5601 Transfer mode dependent, e.g. ATM
• CPC Class Codes: H04L 2012/5618 Bridges, gateways [GW] or interworking units [IWU]
• CPC Class Codes: H04L 2012/5654 using the AAL1
• CPC Class Codes: H04L 2012/5665 Interaction of ATM with other protocols
• CPC Class Codes: H04L 2012/5674 Synchronisation, timing recovery or alignment
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

Upon receipt of a synchronization request from the CPU, the AAL1 device of the act system causes its cell forming section to extract the allocation position information for the SAR-PDU payload about a particular time slot in the current frame and, via the synchronization information send/receive section, transfers the information to the AAL1 device of the standby system. The AAL1 device of the standby system causes its operation processing section to calculate the allocation position of a particular time slot in the next frame for the SAR-PDU payload based on the above allocation position information. The AAL1 device of the standby system starts allocation of the data of and following a particular time slot of the next frame to the SAR-PDU payload starting from the position indicated by the calculation result.

Claims

1. A method performed by one or more devices, comprising:

determining, by one of the one or more devices, synchronization information from one of a plurality of first data signals associated with a data frame, where the synchronization information includes sequence count (SC) information associated with one of a plurality of second data signals to which a particular time slot of the data frame is allocated; and

determining, by one of the one or more devices, SC information, associated with another one of the plurality of second data signals to which a particular time slot of a next data frame is allocated, and allocation position information, for a payload associated with the other one of the plurality of second data signals, based on the synchronization information.

2. The method of claim 1 where the synchronization information further includes:

allocation position information for a payload associated with the one of the plurality of second data signals.

3. The method of claim 2, further comprising:

receiving a synchronization request.

4. The method of claim 3, further comprising:

extracting the synchronization information from the one of the plurality of first data signals in response to receiving the synchronization request.

5. The method of claim 2, where the allocation position information includes information regarding an allocation position for a segmentation and reassembly-protocol data unit (SAR-PDU) payload.

6. The method of claim 1, where the data frame includes a single channel with a plurality of time slots.

7. The method of claim 1, where the data frame includes a plurality of channels, each of the plurality of channels has a plurality of time slots.

8. The method of claim 1, where the plurality of first data signals includes a plurality of synchronous transfer mode data signals and the plurality of second data signals includes a plurality of asynchronous transfer mode data signals.

9. A system comprising:

a first system to;

determine first synchronization information corresponding to one of a plurality of first data signals associated with a data frame, where the first synchronization information includes sequence count (SC) information, associated with one of a plurality of second data signals to which a particular time slot of the data frame is allocated, and allocation position information for a payload associated with the one of the plurality of second data signals; and

a second system to;

determine second synchronization information, corresponding to another one of the plurality of second data signals associated with a subsequent data frame, based on the first synchronization information, and

allocate a position in the subsequent data frame based on the second synchronization information.

10. The system of claim 9, where the second synchronization information includes SC information, associated with the other one of the plurality of second data signals to which a particular time slot of the subsequent data frame is allocated, and allocation position information for a payload associated with the other one of the plurality of second data signals.

11. The system of claim 9, where the plurality of first data signals includes a plurality of synchronous transfer mode data signals and the plurality of second data signals includes a plurality of asynchronous transfer mode data signals.

12. A system comprising:

a first system to;

determine first synchronization information corresponding to one of a plurality of first data signals associated with a data frame, where the first synchronization information includes sequence count (SC) information, associated with one of a plurality of second data signals to which a pointer is inserted, and pointer value information associated with the pointer; and

a second system to;

determine second synchronization information, corresponding to another one of the plurality of second data signals associated with a subsequent data frame, based on the first synchronization information, and

allocate a position in the subsequent data frame based on the second synchronization information.

13. The system of claim 12, where the second synchronization information includes SC information, associated with the other one of the plurality of second data signals to which a particular time slot of the subsequent data frame is allocated, and allocation position information for a payload associated with the other one of the plurality of second data signals.

14. The system of claim 12, where the plurality of first data signals includes a plurality of synchronous transfer mode data signals and the plurality of second data signals includes a plurality of asynchronous transfer mode data signals.

15. A method performed by one or more devices, comprising:

determining, by one of the one or more devices, synchronization information from one of a plurality of first data signals associated with a data frame, the synchronization information including sequence count (SC) information, associated with one of a plurality of second data signals to which a pointer is inserted and pointer value information associated with the pointer, and

determining, by one of the one or more devices, SC information, associated with another one of the plurality of second data signals to which a particular time slot of a next data frame is allocated, and allocation position information for a payload associated with the other one of the plurality of second data signals based on the synchronization information.

16. The method of claim 15, further comprising:

receiving a synchronization request.

17. The method of claim 16, further comprising:

extracting the synchronization information from the one of the plurality of first data signals in response to receiving the synchronization request.

18. The method of claim 15, where the allocation position information includes information regarding an allocation position for a segmentation and reassembly-protocol data unit (SAR-PDU) payload.

19. The method of claim 15, where the plurality of first data signals include synchronous transfer mode data signals and the plurality of second data signals include asynchronous transfer mode data signals.

20. The method of claim 15, where the plurality of second data signals comprise cells.