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    Method and apparatus for ensuring cell ordering in large capacity switching systems and for synchronizing the arrival time of cells to a switch fabric
    3.
    发明授权
    Method and apparatus for ensuring cell ordering in large capacity switching systems and for synchronizing the arrival time of cells to a switch fabric 有权
    用于确保大容量交换系统中的小区排序并使小区到交换结构的到达时间同步的方法和装置

    公开(公告)号：US07408959B2

    公开(公告)日：2008-08-05

    申请号：US10325701

    申请日：2002-12-18

    申请人： Martin Braff ,  Gopalakrishnan Ramamurthy ,  William J. Dally

    发明人： Martin Braff ,  Gopalakrishnan Ramamurthy ,  William J. Dally

    IPC分类号： H04J3/06

    CPC分类号： H04L12/5601 ,  H04L49/608 ,  H04L2012/5674 ,  H04L2012/5681

    摘要： Where links between a port module and plural switch fabric slices are of various lengths, a cell is transmitted from the port module to a switch fabric slice in response to a grant. The transmission is delayed by an amount based on a link round trip delay (RTD) value for the corresponding link between the port module and the switch fabric slice, and a predetermined global delay value. As a result of this delay, the cell arrives at the switch fabric slice at a fixed number of cell times (equal to the global delay value) after issuance of the grant, independent of any link lengths.

    摘要翻译： 在端口模块和多个交换矩阵切片之间的链路具有不同长度的情况下，响应于授权，小区从端口模块传输到交换矩阵切片。 基于端口模块和交换矩阵切片之间的对应链路的链路往返延迟（RTD）值和预定的全局延迟值，传输延迟一定量。 作为这种延迟的结果，独立于任何链路长度，小区在发放授权之后以固定数量的小区时间（等于全局延迟值）到达交换矩阵切片。

    Dynamic rate control scheduler for ATM networks
    5.
    发明授权
    Dynamic rate control scheduler for ATM networks 失效
    ATM网络的动态速率控制调度器

    公开(公告)号：US06408005B1

    公开(公告)日：2002-06-18

    申请号：US08924820

    申请日：1997-09-05

    申请人： Ruixue Fan ,  Brian L. Mark ,  Gopalakrishnan Ramamurthy

    发明人： Ruixue Fan ,  Brian L. Mark ,  Gopalakrishnan Ramamurthy

    IPC分类号： H04L1228

    CPC分类号： H04L47/29 ,  H04L12/5602 ,  H04L47/22 ,  H04L47/50 ,  H04L49/3081 ,  H04L2012/5636 ,  H04L2012/5651 ,  H04L2012/5679 ,  H04L2012/5681 ,  H04L2012/5682 ,  H04Q11/0478

    摘要： A Dynamic Rate Control (DRC) scheduler for scheduling cells for service in a generic Asynchronous Transfer Mode (ATM) switch is disclosed. According to the inventive DRC, each traffic stream associated with an internal switch queue is rate-shaped according to a rate which consists of a minimum guaranteed rate and a dynamic component computed based on congestion information within the switch. While achieving high utilization, DRC guarantees a minimum throughput for each stream and fairly distributes unused bandwidth. The distribution of unused bandwidth in DRC can be assigned flexibly, i.e., the unused bandwidth need not be shared in proportion to the minimum throughput guarantees, as in weighted fair share schedulers. Moreover, an effective closed-loop QoS control can be built into DRC by dynamically updating a set of weights based on observed QoS. Another salient feature of DRC is its ability to control congestion internal congestion at bottleneck points within a multistage switch. DRC can also be extended beyond the local switch in a hop-by-hop fashion.

    摘要翻译： 公开了一种用于在通用异步传输模式（ATM）交换机中调度用于服务的小区的动态速率控制（DRC）调度器。 根据本发明的DRC，与内部交换机队列相关联的每个业务流根据由最小保证速率和基于交换机内的拥塞信息计算的动态组件的速率的速率形状。 在实现高利用率的同时，DRC保证每个流的最小吞吐量，并且公平地分配未使用的带宽。 可以灵活地分配未使用的带宽在DRC中的分配，即，与加权公平共享调度器中的最小吞吐量保证成比例，不需要共享未使用的带宽。 此外，通过基于观察到的QoS动态地更新一组权重，可以在DRC中内置有效的闭环QoS控制。 DRC的另一个突出特点是能够控制多级交换机内瓶颈点的拥塞内部拥塞。 DRC也可以以逐跳方式扩展到本地交换机之外。

    Control architecture for ATM networks
    6.
    发明授权
    Control architecture for ATM networks 失效
    ATM网络的控制架构

    公开(公告)号：US5448567A

    公开(公告)日：1995-09-05

    申请号：US97683

    申请日：1993-07-27

    申请人： Rajiv Dighe ,  Alexander T. Ishii ,  Gopalakrishnan Ramamurthy

    发明人： Rajiv Dighe ,  Alexander T. Ishii ,  Gopalakrishnan Ramamurthy

    IPC分类号： H04Q3/00 ,  H04L12/56 ,  H04Q11/04 ,  H04J3/24

    CPC分类号： H04L12/5602 ,  H04Q11/0478 ,  H04L2012/5637 ,  H04L2012/564 ,  H04L2012/5645

    摘要： A control method and architecture is described for an ATM network carrying connectionless data traffic. The method is capable of integrating connection-oriented as well as connectionless traffic. The method takes advantage of the quasi-deterministic nature of the traffic emanating from a source that is being shaped by the leaky bucket shaping algorithm. Alternative methods are provided if such a shaping algorithm is not provided by the CPE which methods still guarantee performance that equals or exceeds shared media networks such as FDDI. Hardware and software embodiments of the methods are disclosed. The invention is particularly applicable to LANs and hubs.

    摘要翻译： 描述了一种用于承载无连接数据流量的ATM网络的控制方法和架构。 该方法能够集成面向连接和无连接的流量。 该方法利用由泄漏桶整形算法形成的源发出的流量的准确定性。 如果CPE不提供这种整形算法，那么提供替代方法，哪些方法仍然保证等于或超过诸如FDDI的共享媒体网络的性能。 公开了该方法的硬件和软件实施例。 本发明特别适用于LAN和集线器。

    Optimal buffer management scheme with dynamic queue length thresholds for ATM switches
    7.
    发明授权
    Optimal buffer management scheme with dynamic queue length thresholds for ATM switches 失效
    ATM交换机动态队列长度阈值的最优缓冲管理方案

    公开(公告)号：US06424622B1

    公开(公告)日：2002-07-23

    申请号：US09249324

    申请日：1999-02-12

    申请人： Ruixue Fan ,  Alexander Ishii ,  Brian Mark ,  Gopalakrishnan Ramamurthy ,  Qiang Ren

    发明人： Ruixue Fan ,  Alexander Ishii ,  Brian Mark ,  Gopalakrishnan Ramamurthy ,  Qiang Ren

    IPC分类号： H04L1226

    CPC分类号： H04L49/3081 ,  H04L2012/5679 ,  H04L2012/5681 ,  H04L2012/5682 ,  H04Q11/0478

    摘要： A buffer management scheme for an ATM switch where the static and dynamic thresholds are applied appropriately at different levels to ensure efficient and fair usage of buffer memory. A novel dynamic threshold mechanism which, while ensuring fair sharing of memory, maximizes the overall memory utilization. An ATM switch using a dynamic queue threshold scheme, said ATM switch comprising K output port queues and a buffer of B cells sharing said K output port queues, wherein a common threshold is dynamically set for the K output port queues, the common threshold being changed to a new value from an old value when a new cell arrives at any of said K output queues, said new value being a maximum of a length of said any of said K output queues plus one and said old value when total queue length is less than a preset value times B and, said new value being a maximum of a said old value minus one and a statically set minimum buffer threshold when total queue length is greater than or equal to a preset value times B, wherein said preset value is greater than or equal to 0.

    摘要翻译： 一种用于ATM交换机的缓冲器管理方案，其中静态和动态阈值在不同级别适当地应用以确保缓冲存储器的有效和合理使用。 一种新颖的动态阈值机制，在确保公平共享内存的同时，最大限度地提高了内存利用率。 一种使用动态队列阈值方案的ATM交换机，所述ATM交换机包括K个输出端口队列和共享所述K个输出端口队列的B个小区的缓冲器，其中为所述K个输出端口队列动态地设置公共阈值，所述公共阈值被改变 当新单元到达所述K个输出队列中的任一个时，从旧值到新值，所述新值是所述K个输出队列中的任何一个的长度的最大值加上当总队列长度较少时的所述旧输出队列的长度 比预设值乘以B，并且当总队列长度大于或等于预设值乘以B时，所述新值是所述旧值减1的最大值和静态设置的最小缓冲器阈值，其中所述预设值更大 大于等于0。

    Message sets for a flexible programmable ATM access multiplexer using functional separation of line and protocol related functions
    8.
    发明授权
    Message sets for a flexible programmable ATM access multiplexer using functional separation of line and protocol related functions 有权
    使用功能分离线路和协议相关功能的灵活可编程ATM接入复用器的消息集

    公开(公告)号：US06125116A

    公开(公告)日：2000-09-26

    申请号：US185592

    申请日：1998-11-04

    申请人： Rajiv Dighe ,  Subir K. Biswas ,  Vasanthi Thirumalai ,  Kojiro Watanabe ,  Gopalakrishnan Ramamurthy

    发明人： Rajiv Dighe ,  Subir K. Biswas ,  Vasanthi Thirumalai ,  Kojiro Watanabe ,  Gopalakrishnan Ramamurthy

    IPC分类号： H04L12/56 ,  H04Q11/04 ,  H04L12/28

    CPC分类号： H04Q11/0478 ,  H04L2012/561 ,  H04L2012/5626

    摘要： The present invention pertains to message sets for use in a flexible programmable multiplexer for accessing an Asynchronous Transfer Mode (ATM) network. The access multiplexer uses a functional separation of line related functions and protocol related functions. Line interface cards perform line related functions. A message set for use in such a multiplexing system that uses a functional separation of line and protocol related functions is provided. The message set includes a general message, a hello message, a configuration message, a line stabilized message, an identify remote message, an identify remote acknowledgement message, a reset remote message, a report statistics message, a report statistics acknowledgement message, a loopback test message and a dynamic rate adaptation message. A flexible programmable multiplexer that uses the message set is also provided.

    摘要翻译： 本发明涉及用于访问异步传输模式（ATM）网络的灵活可编程多路复用器中的消息集。 接入复用器使用线路相关功能和协议相关功能的功能分离。 线路接口卡执行线路相关功能。 提供了一种用于这种使用线路和协议相关功能的功能分离的复用系统的消息集。 消息集包括通用消息，呼叫消息，配置消息，线路稳定消息，标识远程消息，标识远程确认消息，重置远程消息，报告统计消息，报告统计确认消息，环回 测试消息和动态速率适配消息。 还提供了使用该消息集的柔性可编程多路复用器。

    Multi-class connection admission control method for Asynchronous Transfer Mode (ATM) switches
    9.
    发明授权
    Multi-class connection admission control method for Asynchronous Transfer Mode (ATM) switches 失效
    用于异步传输模式（ATM）交换机的多类连接准入控制方法

    公开(公告)号：US6046981A

    公开(公告)日：2000-04-04

    申请号：US808128

    申请日：1997-02-28

    申请人： Gopalakrishnan Ramamurthy ,  Qiang Ren

    发明人： Gopalakrishnan Ramamurthy ,  Qiang Ren

    IPC分类号： H04Q3/00 ,  H04L12/56 ,  H04Q11/04

    CPC分类号： H04L12/5602 ,  H04Q11/0478 ,  H04L2012/5632 ,  H04L2012/5651

    摘要： A multi-class connection admission control (CAC) method that supports cell loss and delay requirements. In this model-based CAC, the source traffic is described in terms of the usage parameter control (UPC) parameters. Through analysis and approximations, simple closed-form methods to calculate the bandwidth required to meet guarantees on quality of service (QoS) are used. In addition to being robust, the CAC achieves a high level of resource utilization and can be easily implemented for real-time admission control.

    摘要翻译： 一种支持信元丢失和延迟要求的多类连接准入控制（CAC）方法。 在该基于模型的CAC中，根据使用参数控制（UPC）参数来描述源流量。 通过分析和近似，使用简单的封闭形式方法来计算满足服务质量（QoS）保证所需的带宽。 除了稳健之外，CAC还实现了高水平的资源利用，并且可以轻松实现实时准入控制。

    Predictive congestion control of high-speed wide area networks
    10.
    发明授权
    Predictive congestion control of high-speed wide area networks 失效
    高速广域网预测拥塞控制

    公开(公告)号：US5276677A

    公开(公告)日：1994-01-04

    申请号：US905287

    申请日：1992-06-26

    申请人： Gopalakrishnan Ramamurthy ,  Bhaskar Sengupta

    发明人： Gopalakrishnan Ramamurthy ,  Bhaskar Sengupta

    IPC分类号： H04L12/56 ,  H04Q11/04

    CPC分类号： H04L47/30 ,  H04L47/10 ,  H04L47/11 ,  H04L47/263 ,  H04L49/3081 ,  H04Q11/0478 ,  H04L2012/5636

    摘要： To control congestion in packet switching networks, control of the traffic sent by a given station to each of the downstream nodes to which it is directly connected is effected by control of the traffic that the upstream nodes to which it is directly connected are permitted to send to it. In this regard, a predictive model is used to predict the cross traffic, one round trip delay in advance that the given station can expect. The parameters for the predictive model are obtained by measurements in real time and by the use of moving averages. Using the predicted cross traffic, the amount of controlled traffic that the proximate downstream nodes can accommodate from the given node, and the correct state of the given node, the state of the given node one round trip delay into the future is predicted. This prediction is used to schedule the amount of traffic to be sent by each of its proximate upstream nodes.

    摘要翻译： 为了控制分组交换网络中的拥塞，由给定站发送到其直接连接的每个下游节点的流量的控制通过对其直接连接的上游节点被允许发送的业务的控制来实现 给它 在这方面，预测模型用于预测交通流量，给定站预期的一次往返延迟。 预测模型的参数通过实时测量和移动平均值的使用获得。 使用预测的交叉业务，近似下游节点可以从给定节点容纳的受控业务量以及给定节点的正确状态，预测到给定节点的一个往返延迟的状态。 该预测用于调度其每个邻近的上游节点要发送的业务量。