Dual AAL1 device and synchronization method used therewith
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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.
44 Citations
39 Claims
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1-20. -20. (canceled)
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21. A system to convert synchronous transfer mode (STM) data into asynchronous transfer mode (ATM) cells, comprising:
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an active system to;
receive STM data associated with a data frame, determine synchronization information from the STM data, the synchronization information including sequence count (SC) information associated with an ATM cell to which a particular time slot of the data frame is allocated and allocation position information for a payload associated with the ATM cell, and output the synchronization information; and
a standby system to;
receive the synchronization information from the active system, and determine SC information associated with an ATM cell to which the particular time slot of a next data frame is allocated and allocation position information for a payload associated with the ATM cell based on the synchronization information. - View Dependent Claims (22, 23, 24, 25)
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26. A system to convert synchronous transfer mode (STM) data into asynchronous transfer mode (ATM) cells, comprising:
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an active system to;
receive STM data associated with a data frame, determine synchronization information from the STM data, the synchronization information including sequence count (SC) information associated with an ATM cell to which a pointer is inserted and pointer value information associated with the pointer, and output the synchronization information; and
a standby system to;
receive the synchronization information from the active system, and determine SC information associated with an ATM cell to which a particular time slot of a next data frame is allocated and allocation position information for a payload associated with the ATM cell based on the synchronization information. - View Dependent Claims (27, 28, 29, 30)
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31. A system to convert synchronous transfer mode (STM) data into asynchronous transfer mode (ATM) cells, comprising:
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an active system to;
receive STM data associated with a data frame, determine first synchronization information corresponding to an ATM cell associated with the data frame, and output the first synchronization information; and
a standby system to;
receive the first synchronization information from the active system, determine second synchronization information corresponding to an ATM cell 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. - View Dependent Claims (32, 33, 34, 35)
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36. A method to convert synchronous transfer mode (STM) data into asynchronous transfer mode (ATM) cells, comprising:
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receiving STM data associated with a data frame;
determining first synchronization information corresponding to an ATM cell associated with the data frame;
determining second synchronization information corresponding to an ATM cell associated with a subsequent data frame based on the first synchronization information; and
allocating a position in the subsequent data frame based on the second synchronization information.
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37. A system to convert synchronous transfer mode (STM) data into asynchronous transfer mode (ATM) cells, comprising:
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a first system comprising;
means for receiving STM data associated with a data frame, means for determining synchronization information based on the STM data, and means for outputting the synchronization information; and
a second system comprising;
means for receiving the synchronization information from the first system, and means for determining sequence count (SC) information associated with an ATM cell to which a particular time slot of a subsequent data frame is allocated and allocation position information for a payload associated with the ATM cell based on the synchronization information. - View Dependent Claims (38, 39)
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Specification