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    • 1. 发明授权
    • Data transmission synchronization system
    • 数据传输同步系统
    • US06611538B1
    • 2003-08-26
    • US09321469
    • 1999-05-27
    • Oren MalerevichIlan Shimony
    • Oren MalerevichIlan Shimony
    • H04J306
    • H04L7/042H04L2007/045
    • An apparatus and method for providing synchronization in a data transmission system via the use of a short cyclic synchronization sequence inserted in the header of cells to be transmitted. A 2-bit sync sequence is inserted at the beginning of the header in each cell. At the receiving end, a pair of state machines search for and track the sync sequence. A feedback signal is generated that is used by the receiver to adjust its framing so as to align the received data with the boundaries of the cells. To aid in detecting the sync sequence, the two sync bits are rotated each cell cycle. To avoid confusion with data that mimics the sync sequence, the transmitter transmits idle cells containing all ones except for the 2-bit sync sequence field during the period that the receiver is attempting to sync up with the transmitter.
    • 一种用于在数据传输系统中提供同步的装置和方法,所述装置和方法通过使用插入要发送的小区头部的短循环同步序列。 在每个单元格的头部的开头插入2位同步序列。 在接收端,一对状态机搜索并跟踪同步序列。 产生反馈信号,由接收机使用该反馈信号来调整其成帧,以使接收到的数据与单元格的边界对齐。 为了帮助检测同步序列,每个单元周期旋转两个同步位。 为了避免与模拟同步序列的数据混淆,在接收机试图与发射机同步的时间段期间,发射机发送包含除2位同步序列字段之外的所有信息的空闲信元。
    • 7. 发明授权
    • ATM traffic management device
    • ATM流量管理设备
    • US5898669A
    • 1999-04-27
    • US621055
    • 1996-03-22
    • Ilan ShimonyZvika BronsteinEytan MannAvinoam RubinstainGennady DosovitskyEldad Bar-Eli
    • Ilan ShimonyZvika BronsteinEytan MannAvinoam RubinstainGennady DosovitskyEldad Bar-Eli
    • H04L12/56H04L12/66H04Q11/04H04J3/14
    • H04L12/66H04Q11/0478H04L2012/5615H04L2012/5636
    • A traffic management unit for implementing Traffic Management (TM) of Available Bit Rate (ABR) traffic on an Asynchronous Transfer Mode (ATM) network is described. The traffic management unit comprises a traffic management processor coupled to a traffic management memory. The traffic management processor is coupled between a data processor and an ATM interface. An Ethernet workstation is coupled to the data processor through an Ethernet interface. An ATM switch is coupled to the traffic management processor through the ATM interface. The traffic management unit is implemented as a unit separate from the cell scheduling data processor. In addition, in order to utilize network congestion information more efficiently, VCs are grouped according to their output destinations or their path through the network. Congestion feedback for one VC is applied to other VCs within the group. The traffic management startup procedure is streamlined by using a preliminary profile and modifying this preliminary profile in accordance with feedback congestion data received. TM can be disabled for destination end stations not implementing TM. To further streamline the traffic management processes, memory based rate lookup tables containing pre-calculated profile sets are utilized. Each VC uses one of these tables thus obviating the need for time and hardware intensive multiplications and additions. In addition, the traffic management unit implements multicast domain shaping by mapping destination data multicast addresses and protocol types, found in input frames or packets, into destination VCs, thus eliminating the wasteful listen and discard processes associated with broadcast characteristic of Ethernet.
    • 描述了用于在异步传输模式(ATM)网络上实现可用比特率(ABR)流量的流量管理(TM)的流量管理单元。 交通管理单元包括耦合到交通管理存储器的交通管理处理器。 交通管理处理器耦合在数据处理器和ATM接口之间。 以太网工作站通过以太网接口耦合到数据处理器。 ATM交换机通过ATM接口耦合到流量管理处理器。 流量管理单元被实现为与小区调度数据处理器分离的单元。 此外,为了更有效地利用网络拥塞信息,VC根据其输出目的地或其通过网络的路径进行分组。 一个VC的拥塞反馈应用于组内的其他VC。 通过使用初步配置文件简化流量管理启动过程,并根据收到的反馈拥塞数据修改此初步配置文件。 不能实现TM的目的地终端站可以禁用TM。 为了进一步简化流量管理过程,利用包含预先计算的配置文件集的基于内存的速率查找表。 每个VC使用这些表之一,从而避免了对时间和硬件密集乘法和添加的需要。 此外,流量管理单元通过将目的地数据组播地址和输入帧或数据包中的协议类型映射到目标VC中实现组播域整形,从而消除了与以太网广播特性相关的浪费的监听和丢弃过程。