-
公开(公告)号:US06353647B1
公开(公告)日:2002-03-05
申请号:US09062436
申请日:1998-04-17
IPC分类号: H03D324
摘要: A phase-locked loop having very fast acquisition, and low output phase jitter and stability at steady-state is provided. In general, the phase-locked loop is used for synchronizing an output signal of said phase-locked loop with an input reference signal. The filter circuit of the phase-locked loop includes a differentiator responsive to the phase difference representing signal from a phase detector in the PLL for providing a differentiated signal, and a filter responsive to both the phase difference representing signal and the differentiated signal to provide a filter output signal. Preferably, the filter is a low-pass filter. The output signal source of the PLL is controlled by a control signal which is generally based on the filter output signal.
摘要翻译: 提供了一种具有非常快速采集的锁相环,并且在稳态下具有低输出相位抖动和稳定性。 通常,锁相环用于使所述锁相环的输出信号与输入参考信号同步。 锁相环的滤波器电路包括响应于相位差的差分器,该相位差表示来自用于提供微分信号的PLL中的相位检测器的信号,以及响应于相位差表示信号和微分信号两者的滤波器, 滤波器输出信号。 优选地,滤波器是低通滤波器。 PLL的输出信号源通过一般基于滤波器输出信号的控制信号来控制。
-
公开(公告)号:US06445706B1
公开(公告)日:2002-09-03
申请号:US09409518
申请日:1999-09-30
申请人: Clarence Fransson , Gunnar Larsson , Raimo Sissonen , Bengt Kvist
发明人: Clarence Fransson , Gunnar Larsson , Raimo Sissonen , Bengt Kvist
IPC分类号: H04L1228
CPC分类号: H04L49/203 , H04L49/201 , H04L49/30 , H04L49/508 , H04L2012/5651 , H04L2012/5679
摘要: A method and a buffer structure ensure a fair share of the bandwidth between point-to-point and point-to-multipoint connections with the same or different priorities. For each priority class, the buffer structure includes one queue for each physical link of restoring point-to-point cells for each priority level and one queue for point-to-multipoint cells. When a cell is to be transmitted on a link, the point-to-point and point-to-multipoint cells for this link, if any, from the highest priority class in each case are identified. If the cells belong to the same priority class, the cell stored first is transmitted.
摘要翻译: 一种方法和缓冲结构确保了具有相同或不同优先级的点对点和点对多点连接之间的带宽的公平共享。 对于每个优先级类,缓冲区结构包括用于为每个优先级恢复点对点小区的每个物理链路的一个队列,以及用于点对多点小区的一个队列。 当一个小区要在一个链路上传输时,每一种情况都会识别这个链路的点到点和点到多点的单元,如果有的话,最高优先级。 如果这些单元属于相同的优先级,则先发送存储的单元。
-
3.
公开(公告)号:US6128295A
公开(公告)日:2000-10-03
申请号:US893677
申请日:1997-07-11
CPC分类号: H04L49/3081 , H04L49/203 , H04Q11/0478 , Y10S370/905
摘要: An Asynchronous Transfer Mode (ATM) switching device (20) has ATM cells (both point-to-point and point-to-multipoint) routed therethrough to one or more physical output links (31-38). The switching device (20) includes a cell buffer memory (92) which is the sole storage area on an egress exchange terminal for all cells, including point-to-multipoint cells, regardless of to which physical output link the cell is destined. For point-to-multipoint cells, pointers to the location of the cell in the cell buffer memory (92) are stored in one or more pointer queues (114), the pointer queues (114) corresponding to physical output links over which the point-to-multipoint cells are expected to be propagated. As each physical output link is selected, the pointer in the corresponding pointer queue is used to obtain the cell from the cell buffer memory (92) for readout on the selected link.
摘要翻译: 异步传输模式(ATM)交换设备(20)具有通过其路由到一个或多个物理输出链路(31-38)的ATM信元(点对点和点对多点)。 交换设备(20)包括一个小区缓冲存储器(92),它是所有小区的出口交换终端上唯一的存储区域,包括点对多点小区,而不考虑该小区的哪个物理输出链路。 对于点对多点小区,指向单元缓冲存储器(92)中的单元的位置的指针存储在一个或多个指针队列(114)中,指针队列(114)对应于物理输出链路,在该指针队列 对多点细胞有望传播。 当选择每个物理输出链路时,使用相应指针队列中的指针从单元缓冲存储器(92)中获取单元,以在所选择的链路上读出。
-
-