公开(公告)号：US08467417B2

公开(公告)日：2013-06-18

申请号：US11782895

申请日：2007-07-25

申请人： Philippe Lamothe ,  Michel Ouellette ,  Marc-André Rochon

发明人： Philippe Lamothe ,  Michel Ouellette ,  Marc-André Rochon

IPC分类号： H04J3/06

CPC分类号： H04L67/1095 ,  H04J3/0635 ,  H04L7/02

摘要： A system for synchronizing a first network device and a second network device. The first network device comprises an interface configured to release over a communication link a first signal carrying a first data stream clocked by a first clock signal. The second network device comprises an interface configured to receive the first signal over the communication link. The second network device also comprises a clock extraction module configured to generate an extracted clock signal from the received first signal; and a data coding module configured to clock a second data stream with an output clock signal selected based on a speed of a locally generated clock signal relative to the first clock signal or the extracted clock signal, thereby to produce a second signal for transmission from the second network element to the first network element. By clocking the second data stream with the fastest available clock signal, greater link utilization can be achieved. Furthermore, synchronism between the first and second network elements reduces the incidence of sync slips, which permits a reduction in the size of inter-frame gaps and also affords the use of a clock frequencies exceeding the nominal rate, leading to even greater link utilization.

摘要翻译： 一种用于同步第一网络设备和第二网络设备的系统。 第一网络设备包括被配置为通过通信链路释放承载由第一时钟信号定时的第一数据流的第一信号的接口。 第二网络设备包括被配置为通过通信链路接收第一信号的接口。 第二网络设备还包括：时钟提取模块，被配置为从接收到的第一信号产生提取的时钟信号; 以及数据编码模块，被配置为使用基于相对于所述第一时钟信号或所提取的时钟信号的本地生成的时钟信号的速度选择的输出时钟信号对第二数据流进行时钟，由此产生用于从 第二网络元件到第一网络元件。 通过以最快的可用时钟信号计时第二数据流，可以实现更大的链路利用率。 此外，第一和第二网络元件之间的同步减少了同步滑移的入射，这允许减小帧间间隙的大小，并且还提供使用超过标称速率的时钟频率，导致甚至更大的链路利用率。