公开(公告)号：WO2006020002A9

公开(公告)日：2006-06-15

申请号：PCT/US2005025135

申请日：2005-07-15

Applicant: ARRIS INT INC

Inventor： DOWNEY DENNIS ,  VOLKOV ALEX ,  HARRINGTON MICHAEL ,  O'KEEFFE FRANK ,  KHARKUNOU YURY

IPC: H04J3/06

CPC classification number: H04J3/0661 ,  H04J3/0664 ,  H04J3/0682 ,  H04L7/0008 ,  H04L27/34

Abstract: The clocks of one or more edgeQAM devices are synchronized with a master clock at the remotely located CMTS. A master clock signal may be transmitted via a dedicated gigabit Ethernet link. Alternatively, master clock information contained in a time synchronization message may be transmitted for use in adjusting local oscillators that drive local clocks at respective edgeQAM devices. In another embodiment, the downstream sample rate to particular edgeQAM devices may be sampled and used to lock a local clock at respective canary modems dedicated to each edgeQAM device. A canary modem's clock is compared to the master clock, and a resulting phase error is communicated to the respective edgeQAM device for use in adjusting its local clock. Or, TDMA upstream ranging burst average trends are used to estimate edgeQAM clock error. Each respective edgeQAM uses this error to adjust its clock.

Abstract translation: 一个或多个edgeQAM设备的时钟与位于远程的CMTS的主时钟同步。 主时钟信号可以通过专用的千兆以太网链路传输。 或者，可以发送包含在时间同步消息中的主时钟信息，以用于调整在各个边缘QAM设备处驱动本地时钟的本地振荡器。 在另一个实施例中，可以对特定边缘QAM设备的下行采样率进行采样并用于锁定专用于每个边缘QAM设备的相应金丝雀调制解调器中的本地时钟。 将金丝雀调制解调器的时钟与主时钟进行比较，并将得到的相位误差传送到相应的边缘QAM设备以用于调整其本地时钟。 或者，使用TDMA上行测距突发平均趋势来估计edgeQAM时钟误差。 每个相应的edgeQAM使用此错误来调整其时钟。

公开(公告)号：WO2006020002A3

公开(公告)日：2007-05-18

申请号：PCT/US2005025135

申请日：2005-07-15

Applicant: ARRIS INT INC

Inventor： DOWNEY DENNIS ,  VOLKOV ALEX ,  HARRINGTON MICHAEL ,  O'KEEFFE FRANK ,  KHARKUNOU YURY

IPC: H04J3/06 ,  H04N5/44 ,  H04N7/173

CPC classification number: H04J3/0661 ,  H04J3/0664 ,  H04J3/0682 ,  H04L7/0008 ,  H04L27/34

Abstract: The clocks of one or more edgeQAM (58A) devices are synchronized with a master clock (12) at the remotely located CMTS (8). A master clock signal may be transmitted via a dedicated gigabit Ether link (6). Alternatively, master clock information contained in a time synchronization message may be transmitted for use in adjusting local oscillators (68A) that drive local clocks (14) at respective edgeQAM devices (58 a...n).

Abstract translation: 一个或多个边缘QAM（58A）设备的时钟与远程定位的CMTS（8）处的主时钟（12）同步。 主时钟信号可以通过专用千兆以太网链路（6）传输。 或者，可以发送包含在时间同步消息中的主时钟信息，以用于调整在相应边缘QAM设备（58a ... n）处驱动本地时钟（14）的本地振荡器（68A）。