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公开(公告)号：US07411970B2
公开(公告)日：2008-08-12
申请号：US10646087
申请日：2003-08-22
CPC分类号： H04J3/0632 , H04J3/0682
摘要： A method of recovering a clock signal for a TDM output from packets of TDM data which have been transmitted over a packet network, from a source having a source TDM clock to a destination having a destination TDM clock. The method includes providing at least some packets with a Remote Time stamp representing the state of the source TDM clock when the packet is created; providing said at least some packets with a Local Timestamp representing the state of the destination TDM clock when the packet is received; determining a Transit Time value representing the difference between said Local and Remote Timestamps; and controlling the clock frequency of the TDM output on the basis of said Transit Time as determined above.
摘要翻译： 一种从已经通过分组网络发送的TDM数据的分组从具有源TDM时钟的源到具有目的地TDM时钟的目的地的TDM输出的时钟信号的恢复方法。 该方法包括：在创建分组时，提供表示源TDM时钟的状态的远程时间戳的至少一些分组; 当接收到所述分组时，向所述至少一些分组提供表示目的地TDM时钟的状态的本地时间戳; 确定表示所述本地和远程时间戳之间的差的传输时间值; 以及基于上述确定的所述运输时间来控制TDM输出的时钟频率。
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公开(公告)号：US07085265B2
公开(公告)日：2006-08-01
申请号：US10152365
申请日：2002-05-21
申请人： Geoffrey Edward Floyd , Timothy Michael Edmund Frost , James F. Kosolowski , Martin Raymond Scott
发明人： Geoffrey Edward Floyd , Timothy Michael Edmund Frost , James F. Kosolowski , Martin Raymond Scott
CPC分类号： H04L29/06
摘要： A method of mapping between contexts of a packet network and TDM channels and streams. The method comprises constructing a lookup table defining the sequence in which data is to be mapped between contexts and TDM channels and streams, and including for each row of the table a flag which indicates whether or not that entry is the first entry in the table for the corresponding context. As the TDM receive or transmit entity cycles through the lookup table, use is made of the flags to synchronize the start of each packet with the first entry of a TDM frame for each context.
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公开(公告)号：US07817673B2
公开(公告)日：2010-10-19
申请号：US12056735
申请日：2008-03-27
IPC分类号： H04J3/06
CPC分类号： H04J3/0632 , H04J3/0664
摘要： A method of synchronising first and second clocks coupled respectively to ingress and egress interfaces 6,7 of a packet network 1, the method comprising calculating a minimum packet Transit Time over the network 1 in each of successive time intervals, and varying the frequency of the second clock so as to track variations in the minimum packet Transit Time.
摘要翻译： 一种使分组网络1的入口和出口接口6,7分别耦合的第一和第二时钟的方法，所述方法包括：在每个连续的时间间隔内，通过网络1计算最小分组传输时间，并且改变 以便跟踪最小分组传输时间的变化。
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公开(公告)号：US07277452B2
公开(公告)日：2007-10-02
申请号：US10215895
申请日：2002-08-09
申请人： Geoffrey Edward Floyd , Timothy Michael Edmund Frost , James F. Kosolowski , Martin Raymond Scott
发明人： Geoffrey Edward Floyd , Timothy Michael Edmund Frost , James F. Kosolowski , Martin Raymond Scott
CPC分类号： H04L29/06
摘要： A method of updating a lookup table associated with a TDM transmit unit which is coupled to a packet network to receive data therefrom, the lookup table mapping packet network contexts to TDM channels. The method includes priming a controller with data for updating the lookup table in advance of the receipt of packets containing data to which the update relates, incorporating a flag in each packet sent over the packet network to the TDM transmit unit, the flag being set to indicate whether or not a packet is the first packet to which the update relates, and detecting the setting of the flag in a first packet and in response updating the lookup table with the update data.
摘要翻译： 一种更新与TDM发送单元相关联的查找表的方法，所述查找表耦合到分组网络以从其接收数据，所述查找表将分组网络上下文映射到TDM信道。 该方法包括在接收到包含与更新相关的数据的分组的接收之前更新查找表的数据的控制器，其中包括通过分组网络发送到TDM发送单元的每个分组中的标志，该标志被设置为 指示分组是否是更新涉及的第一分组，并且检测第一分组中的标志的设置，并且响应于使用更新数据更新查找表。
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