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2. 发明授权

US06792005B1 Timing circuitry for muxing/demuxing of optical communication signals 有权
标题翻译：定时电路，用于复用/解复用光通信信号
公开(公告)号：US06792005B1
公开(公告)日：2004-09-14
申请号：US09658516
申请日：2000-09-08
申请人： Roman Antosik , Andrew Schnable , Lewis K. Stroll , Richard L. Ukeiley
发明人： Roman Antosik , Andrew Schnable , Lewis K. Stroll , Richard L. Ukeiley
IPC分类号： H04J306
CPC分类号： H04J3/0685 , H04J3/0688
摘要： Circuitry for a node of an optical communication network is configured to mux (i.e., combine) one or more incoming customer signals for transmission as a single outgoing optical signal and to demux (i.e., split) an incoming optical signal into one or more outgoing customer signals, where the muxing and demuxing clocks are selected from one or more customer clocks recovered from the one or more customer signals, an input clock recovered from the incoming optical signal, and a local clock generated by a local clock generator. When configured for an add/drop configuration, the circuitry selects (1) the muxing clock from the one or more customer clocks, the input clock, and the local clock and (2) the demuxing clock from the input clock and the local clock. When configured for a drop/continue configuration, the circuitry is configured to select both the muxing and demuxing clocks from either the first input clock or the local clock. The circuitry is configured to perform a hardware-based switch to select the backup clock as the new muxing clock upon detection of a loss-of-clock condition for the previously selected muxing clock. The node automatically coordinates its selection of muxing clocks with the other corresponding node in order to avoid loop-timing problems.
摘要翻译：用于光通信网络的节点的电路被配置为多路复用（即，组合）一个或多个传入的客户信号作为单个输出光信号，并将输入光信号分解为一个或多个输出客户信号，其中从一个或多个客户信号恢复的一个或多个客户时钟中选择复用和解复用时钟，从入射光信号恢复的输入时钟以及由本地时钟发生器产生的本地时钟。当配置为加/减配置时，电路从一个或多个客户时钟，输入时钟和本地时钟中选择（1）复用时钟，以及（2）来自输入时钟和本地时钟的解复用时钟。当配置为丢弃/继续配置时，电路配置为从第一个输入时钟或本地时钟中选择复用和解复用时钟。该电路被配置为在检测到先前选择的复用时钟的时钟损失状况时，执行基于硬件的交换机来选择备份时钟作为新的复用时钟。节点自动协调其选择的多路复用时钟与其他相应的节点，以避免环路定时问题。

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