ATM cell transfer system in which use efficiency of transmission line is
improved
    1.
    发明授权
    ATM cell transfer system in which use efficiency of transmission line is improved 失效
    传输线的使用效率提高的ATM信元传输系统

    公开(公告)号:US5946312A

    公开(公告)日:1999-08-31

    申请号:US950594

    申请日:1997-10-15

    申请人: Makoto Suzuki

    发明人: Makoto Suzuki

    摘要: In an asynchronous transfer mode (ATM) cell transfer apparatus, a valid cell detecting circuit determines whether or not each of ATM cells is valid, based on a specific data of the ATM cell. When it is determined that the ATM cell is not valid, the valid cell detecting circuit discards the ATM cell. On the other hand, when it is determined that the ATM cell is valid, the valid cell detecting circuit writes the ATM cell in a buffer circuit. A read control circuit reads out the ATM cell from the buffer circuit.

    摘要翻译: 在异步传输模式(ATM)小区传输装置中,有效小区检测电路基于ATM信元的特定数据来确定每个ATM信元是否有效。 当确定ATM信元无效时,有效信元检测电路丢弃ATM信元。 另一方面,当确定ATM信元有效时,有效信元检测电路将ATM信元写入缓冲电路。 读取控制电路从缓冲电路读出ATM信元。

    Network coupling device with small cell memory
    2.
    发明授权
    Network coupling device with small cell memory 失效
    具有小单元存储器的网络耦合器件

    公开(公告)号:US06847646B1

    公开(公告)日:2005-01-25

    申请号:US09017096

    申请日:1998-02-02

    摘要: A coupling device (switch) for a local network operating in the asynchronous transfer mode (ATM) which comprises a central cell memory (CCM) for buffer storage of packets (frames) formed by individual ATM cells and arriving on feed lines, a central memory control device for controlling the storage in the central cell memory (CCM) and the writing and reading processes of the packets into and from the central cell memory (CCM). The control device includes a counting circuit for counting the ATM cells arriving in the central cell memory (CCM) and a discarding circuit for discarding ATM cells packet by packet for preventing a congestion in the central cell memory (CCM). To enable an efficient buffer management also in the case of very small cell memories, in particular below 1000 cells, the central memory control device comprises at least one comparator device connected upstream of the central cell memory, which comparator device cooperates with the counting circuit and with a control logic such that, when a programmable threshold value (Ldisc) for the degree of filling of the central cell memory (CCM) is reached, a programmable number of links (VC) are defined on the basis of the sequence of arrival of the ATM cells assigned to the relevant link (VC), and in that each ATM cell of the packet belonging to the defined VC value is discarded before it arrives in the central cell memory.

    摘要翻译: 一种用于在异步传输模式(ATM)中工作的本地网络的耦合设备(交换机),其包括用于缓冲存储由各ATM单元形成并到达馈线的分组(帧)的中央单元存储器(CCM),中央存储器 用于控制中央单元存储器(CCM)中的存储的控制装置以及来自中央单元存储器(CCM)的分组的写入和读取处理。 控制装置包括用于对到达中央单元存储器(CCM)的ATM单元进行计数的计数电路和用于逐个地逐个丢弃ATM信元的废弃电路,以防止中央单元存储器(CCM)中的拥塞。 为了在非常小的单元存储器(特别是小于1000个单元)的情况下也能够实现高效的缓冲器管理,中央存储器控制设备包括连接到中央单元存储器上游的至少一个比较器设备,比较器设备与计数电路配合, 具有控制逻辑,使得当达到用于中央单元存储器(CCM)的填充程度的可编程阈值(Ldisc)时,基于到达的顺序来定义可编程数量的链接(VC) 分配给相关链路(VC)的ATM信元,并且属于定义的VC值的分组的每个ATM信元在其到达中央信元存储器之前被丢弃。

    Hybrid ATM adaptation layer
    3.
    发明授权
    Hybrid ATM adaptation layer 失效
    混合式ATM适配层

    公开(公告)号:US5946309A

    公开(公告)日:1999-08-31

    申请号:US701146

    申请日:1996-08-21

    IPC分类号: H04L12/56 H04Q11/04 H04L12/66

    摘要: In a telecommunication system that generates more than one type of communication data stream, in which each data stream exhibits a distinctive data transfer format, bandwidth utilization is improved by first reformatting the different data transfer formats so that all of the data is compatible with a common data transfer protocol, for example, the Asynchronous Transfer Mode (ATM) protocol. The communication data and the corresponding control data, required to maintain communication data alignment, are multiplexed into a single data stream which is then transmitted over a common telecommunication channel to a receiving station.

    摘要翻译: 在生成多于一种类型的通信数据流的电信系统中,其中每个数据流呈现出独特的数据传输格式,通过首先重新格式化不同的数据传输格式,使得所有数据与公共的 数据传输协议,例如异步传输模式(ATM)协议。 维持通信数据对准所需的通信数据和对应的控制数据被多路复用到单个数据流中,然后通过公共电信信道将数据流发送到接收站。

    Method and apparatus for segmenting network traffic variable length frames
    4.
    发明授权
    Method and apparatus for segmenting network traffic variable length frames 失效
    分段网络流量可变长度帧的方法和装置

    公开(公告)号:US06714562B1

    公开(公告)日:2004-03-30

    申请号:US09522369

    申请日:2000-03-10

    IPC分类号: H04J324

    摘要: Method and apparatus for segmenting variable length frames into fixed length cells in a network equipment. The method allows preparing information to build the cells resulting in the segmenting of a succession of frames directed to the same destination in said network equipment. The cell may be packed with more than one frame. The cell information comprises the address where to read the frame data in a first storage unit, the cell header itself which indicates if the cell includes data from one packet or for more packets, a pointer per each of said more packets, designating the place of the end of data of the previous packet in the cell and a cell type field indicating one of the following types: a start of a new frame type, a continuation of frame type, a end of current frame type and a start and a end of a new frame type. The segmenting apparatus comprises a finite state machine using an Add/substract unit to compute the cell information and write said cell information in a second storage unit.

    摘要翻译: 用于将可变长度帧分割成网络设备中的固定长度单元的方法和装置。 该方法允许准备信息以构建小区,从而导致在所述网络设备中定向到同一目的地的一系列帧的分段。 电池可以包装多于一个框架。 小区信息包括在第一存储单元中读取帧数据的地址,指示小区是否包括来自一个分组的数据或更多分组的小区头自身,每个更多分组的指针,指定每个分组的位置 小区中的先前分组的数据的结束以及指示以下类型之一的小区类型字段:新帧类型的开始,帧类型的继续,当前帧类型的结束以及开始和结束 一种新的帧类型。 分割装置包括使用加/减单元计算单元信息并在第二存储单元中写入所述单元信息的有限状态机。

    Asynchronous transfer mode adaptation layer (AAL) processing method
    5.
    发明授权
    Asynchronous transfer mode adaptation layer (AAL) processing method 失效
    异步传输模式适配层(AAL)处理方法

    公开(公告)号:US06262995B1

    公开(公告)日:2001-07-17

    申请号:US09053276

    申请日:1998-04-01

    申请人: Jong-In Kwak

    发明人: Jong-In Kwak

    IPC分类号: H04L1256

    摘要: An asynchronous transfer mode adaptation layer (AAL) processing apparatus using a central processing unit in an asynchronous transfer mode (ATM) terminal includes: a physical layer for performing physical functions and supporting universal test and operations physical interface for ATM (UTOPIA); a software segmentation and reassembly interface device (SSID) for storing ATM cells outputted by the physical layer in a double port RAM under the control of a central processing unit and outputting to the physical layer the ATM cells, which have been stored in the double port RAM by the central processing unit, under the control of the central processing unit; a double port RAM for storing the ATM cells depending upon the control of the central processing unit or the SSID; a system memory for temporarily storing the ATM cells of the central processing unit; and a central processing unit, for storing in the double port RAM the user data, produced by reassembly of the ATM cells stored in the double port RAM, for storing in the double port RAM the ATM cells produced by segmentation of the user data stored in the double port RAM, and for controlling the overall system.

    摘要翻译: 在异步传输模式(ATM)终端中使用中央处理单元的异步传输模式适配层(AAL)处理装置包括:用于执行物理功能并支持用于ATM(UTOPIA)的通用测试和操作物理接口的物理层; 软件分段和重组接口设备(SSID),用于在中央处理单元的控制下存储由双端口RAM中的物理层输出的ATM信元,并将已经存储在双端口中的ATM信元输出到物理层 RAM由中央处理单元,在中央处理单元的控制下; 双端口RAM,用于根据中央处理单元或SSID的控制来存储ATM信元; 用于临时存储中央处理单元的ATM信元的系统存储器; 以及中央处理单元,用于在双端口RAM中存储通过重新组合存储在双端口RAM中的ATM单元而产生的用户数据,以将存储在双端口RAM中的用户数据分段产生的ATM信元存储在双端口RAM中 双端口RAM,并用于控制整个系统。