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公开(公告)号：EP0460835A2
公开(公告)日：1991-12-11
申请号：EP91304709.8
申请日：1991-05-24
申请人： GPT LIMITED
CPC分类号： H04J3/0685 , H04J3/0623
摘要： The invention concerns a method of pointer processing a digital TDM data stream at a node of a synchronous SDH transmission network so as to justify the data stream on transmission, the data stream having a specified line frequency and being composed of frames, each frame containing a reference word, and the node of the transmission network having a node frequency, the method comprising storing the incoming data stream in a buffer store at the node, using the line reference of the incoming data stream to extract a data pointer from the data stream for each frame, which data pointer indicates the location of the reference word of that frame in the buffer store, and characterised in that a timing pointer is extracted from the incoming data stream utilising the line reference and a line clock the frequency of which is a multiple of the line reference; the timing pointer so extracted is converted into a reference value by utilising the node reference and a node clock; the reference value is utilised to generate a node timing pointer; the node timing pointer is compared with a read address and data pointer; and read-out from the buffer store is justified in accordance with the results of the comparison.
摘要翻译： 本发明涉及一种在同步SDH传输网络的节点上指针处理数字TDM数据流的方法，以便在发送时证明数据流，数据流具有指定的线路频率并由帧组成，每个帧包含一个 参考字和具有节点频率的传输网络的节点，该方法包括使用输入数据流的线路引用将输入数据流存储在节点的缓冲存储器中，以从数据流中提取数据指针 每个帧，哪个数据指针指示该帧在缓冲存储器中的参考字的位置，并且其特征在于，使用线路参考从输入数据流中提取定时指针，频率为多个的线路时钟 的线参考; 所提取的定时指针通过利用节点参考和节点时钟被转换成参考值; 该参考值用于生成节点定时指针; 将节点定时指针与读地址和数据指针进行比较; 并且从缓冲存储器读出根据比较的结果是合理的。
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公开(公告)号：EP0460835A3
公开(公告)日：1993-03-03
申请号：EP91304709.8
申请日：1991-05-24
申请人： GPT LIMITED
CPC分类号： H04J3/0685 , H04J3/0623
摘要： The invention concerns a method of pointer processing a digital TDM data stream at a node of a synchronous SDH transmission network so as to justify the data stream on transmission, the data stream having a specified line frequency and being composed of frames, each frame containing a reference word, and the node of the transmission network having a node frequency, the method comprising storing the incoming data stream in a buffer store at the node, using the line reference of the incoming data stream to extract a data pointer from the data stream for each frame, which data pointer indicates the location of the reference word of that frame in the buffer store, and characterised in that a timing pointer is extracted from the incoming data stream utilising the line reference and a line clock the frequency of which is a multiple of the line reference; the timing pointer so extracted is converted into a reference value by utilising the node reference and a node clock; the reference value is utilised to generate a node timing pointer; the node timing pointer is compared with a read address and data pointer; and read-out from the buffer store is justified in accordance with the results of the comparison.
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