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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:US20080212619A1
公开(公告)日:2008-09-04
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:US20060146865A1
公开(公告)日:2006-07-06
申请号:US11290527
申请日:2005-12-01
IPC分类号: H04L12/66
CPC分类号: H04J3/0632 , H04L47/10
摘要: A method of preparing packets for injection into a packet network at an ingress interface of the packet network, for transmission over the network. The method comprises, at the ingress interface, receiving at least two parallel, constant bit rate streams of data, and separately packetising the constant bit rate streams to generate respective packet flows for forwarding to a packet sender. The frequency of at least one of the packet flows with respect to another packet flow is set so as to reduce the degree of correlation between the packet flows, and the packet flows sent to the same or different egress interfaces over the packet network.
摘要翻译: 一种在分组网络的入口接口处准备用于注入分组网络的分组的方法,用于在网络上传输。 该方法包括在入口接口处接收至少两个并行的恒定比特率数据流,并且分别打包固定比特率流以产生用于转发到分组发送者的相应分组流。 设置相对于另一分组流的分组流中的至少一个的频率,以便减少分组流之间的相关程度以及通过分组网络发送到相同或不同的出口接口的分组流。
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公开(公告)号:US20070223484A1
公开(公告)日:2007-09-27
申请号:US11723394
申请日:2007-03-19
CPC分类号: H04J3/0664 , H04J3/0632 , H04J3/0682 , H04L12/403 , H04L45/10
摘要: A timing source is provided for sending timing information via a packet network. The source comprises a first clock for generating the timing information and a packet forming section for forming a sequence of packets. An output section in the form of a packet launch control section transmits the packets via the network as packet bursts, each of which comprises a plurality of packets with the intervals between consecutive packets of each burst being less than the intervals between consecutive packets. A time-stamping section inserts into each packet a transmission time derived from the timing information generated by the clock.
摘要翻译: 提供定时源,用于经由分组网络发送定时信息。 源包括用于产生定时信息的第一时钟和用于形成分组序列的分组形成部分。 分组发射控制部分形式的输出部分经由网络发送分组,作为分组突发,每个分组包括多个分组,每个分组的连续分组之间的间隔小于连续分组之间的间隔。 时间戳部分从时钟产生的定时信息中插入到每个分组中的传输时间。
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5.
公开(公告)号:US20070223537A1
公开(公告)日:2007-09-27
申请号:US11723751
申请日:2007-03-21
申请人: Martin Crowle , Timothy Frost
发明人: Martin Crowle , Timothy Frost
IPC分类号: H04J3/06
CPC分类号: H04J3/0667
摘要: An arrangement is provided for determining the relative time alignment between a first time base in a first interface and a second time base in a second interface. Packets of different sizes are sent in either or both directions and their propagation delays are determined in an alignment control section at the destination. The calculated propagation delays may then be used to improve the alignment of the “slave” time base.
摘要翻译: 提供了一种用于确定第一接口中的第一时基与第二接口中的第二时基之间的相对时间对准的布置。 在一个或两个方向上发送不同大小的包,并且它们的传播延迟在目的地的对准控制部分中确定。 然后可以使用所计算的传播延迟来改善“从”时基的对准。
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公开(公告)号:US20070223459A1
公开(公告)日:2007-09-27
申请号:US11725542
申请日:2007-03-20
申请人: Martin Crowle , Timothy Frost
发明人: Martin Crowle , Timothy Frost
IPC分类号: H04L12/66
CPC分类号: H04L12/66 , H04J3/0664 , H04L47/10 , H04L47/283 , H04L47/365
摘要: A timing source is provided for sending timing information via a packet network. The source comprises a clock for generating the timing information and a packet-forming section for forming a sequence of packets for transporting the timing information to a destination node. A time-stamping section inserts into each packet of the sequence a transmission time derived from the clock and acts as an output section for forwarding the packets to the network at the respective transmission times. In one mode, the packet forming section forms all of the packets of the sequence with the largest size which the packet network is capable of transporting. In another mode, the packets of the sequence have a distribution of sizes which may be fixed or which may vary in response to traffic conditions.
摘要翻译: 提供定时源,用于经由分组网络发送定时信息。 源包括用于产生定时信息的时钟和用于形成用于将定时信息传送到目的地节点的分组序列的分组形成部分。 时间戳部分将从时钟导出的传输时间插入到序列的每个分组中,并且用作在各个传输时间将分组转发到网络的输出部分。 在一种模式中,分组形成部分形成分组网络能够传输的具有最大尺寸的序列的所有分组。 在另一种模式中,序列的分组具有可以是固定的或可以响应于交通状况而变化的大小的分布。
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