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    • 5. 发明公开
    • An arrangement for minimizing cell-delay variations in a communications system that supports multiple constant-bit-rate connections
    • 一种用于在通信系统中具有多个恒定比特率连接最小化单元延迟抖动
    • EP0964602A1
    • 1999-12-15
    • EP99304072.4
    • 1999-05-26
    • LUCENT TECHNOLOGIES INC.
    • Petty, Norman W.
    • H04Q11/04
    • H04Q11/0478H04L2012/5649H04L2012/5654H04L2012/5679
    • An ATM cell constructor (100) limits transmission-delay variations between successive cells of traffic of individual narrowband and wideband channels in a multi-channel environment. Whenever an ATM AAL1 layer (112) of processing completes assembling (606) an ATM cell payload for a narrowband channel (611), it increments (612) a count that anticipates the number of ATM cells that will mature for transmission during the next cell construction period. For wideband channels, a function checks (1010) whether traffic from the number of narrowband channels that form the wideband channel will result in completion of assembly of that channel's cell payload during the next cell construction period; if so, the function increments (1012) the abovementioned count. The count is reset (302) at the beginning of each cell construction period. Upon receipt (700) of a command to add (start processing) a new channel, a TSI controller (132) compares (704) the count against a threshold that equals the total number of presently-active channels divided by the number of octets of traffic carried by each cell, plus one. If the threshold exceeds the count, the TSI controller sets up (706) a TSI (108) to start processing the new channel; otherwise the TSI controller delays (712-714) setting up the TSI to process the new channel until occurrence (902) of a cell construction period when the threshold exceeds the count. The net effect is to shift the delay variations from cells of active channels to the start-up of processing of new channels.
    • 一个ATM信元的构造(100)限制在多通道环境个体窄带和宽带信道的通信量的连续单元之间传输延迟变化。 每当在处理的ATM AAL1层(112)完成组装(606)到ATM信元净荷的计数做了窄带信道(611),它增加(612)预计下一个单元期间thatwill熟化传输ATM信元的数目 工期。 对于宽带信道,一个功能检查(1010)是否流量从窄带信道的数量没有形成所述宽带信道将导致装配完成做在下一小区施工期间信道的信元净荷; 如果是的话,函数增量(1012)上述计数。 计数是在每个小区施工周期的开始复位(302)。 当一个命令的接收(700)添加(开始处理)的新信道,一个TSI控制器(132)比较(704)与阈值的计数确实等于当前活跃信道通过的八位位组数除以总数 交通由每个单元,加上一个携带。 如果阈值超过所述计数时,TSI控制器设置(706)一个TSI(108),以开始处理新的信道; 否则TSI控制器延迟(712-714)建立TSI当阈值超过计数处理的细胞施工期间的新的信道,直到发生(902)。 净效果是将延迟变化从活动通道到新的信道处理的启动的细胞转移。
    • 9. 发明公开
    • An arrangement for synchronization of a stream of synchronous traffic delivered by an asynchronous medium
    • 装置用于同步的同步流的流量,所述流量是由Asynchronmedien衍生
    • EP0987919A1
    • 2000-03-22
    • EP99307095.2
    • 1999-09-07
    • LUCENT TECHNOLOGIES INC.
    • Petty, Norman W.
    • H04Q11/04
    • H04Q11/0478H04L2012/5618H04L2012/5649H04L2012/5672
    • An ATM cell constructor (100) of an ATM transmitter assembles a stream of frames of constant bit-rate traffic received on a listen TDM bus (102) into cell payloads using ATM adaptation layer 1 (AAL1). Once every eight cells, the AAL1 structured data transfer (SDT) cell constructor layer (112) introduces a one-octet SDT offset pointer into the payload. This pointer designates traffic-block (TDM frame) boundaries. The payload with an attached ATM header forms an ATM cell, and the constructor transmits a stream of the ATM cells to an ATM cell deconstructor of an ATM receiver. The deconstructor disassembles the payloads of the received ATM cells and transmits the stream of frames of constant bit-rate traffic on a talk TDM bus (102). In response to each received SDT offset pointer, the deconstructor's time slot interchanger resets to the start of frame-processing, thereby aligning frames formed by the TSI with the received frames. The deconstructor detects occurrence of TDM frames on the talk TDM bus and synchronizes (aligns) transmission of the frames formed by the TSI with the TDM frames on the talk TDM bus. The listen and talk TDM buses are thereby synchronized with each other.
    • 一个ATM发送器的ATM信元的构造(100),组装一个TDM总线上接收恒定比特率业务的帧流听(102)到使用ATM适配层1(AAL1)细胞的有效载荷。 一旦每八个细胞中,AAL1结构化数据传输(SDT)细胞构造层(112)介绍的一八位位组SDT偏移指针到有效负载。 该指针指定的流量块(TDM帧)的边界。 与附接ATM信头形式的ATM信元,并构造有效载荷发送ATM信元到ATM信元流,以拆解一个ATM接收器。 该解构拆开所接收的ATM信元的有效载荷和将通话TDM总线(102)上的恒定比特率业务的帧的流。 响应于每个接收的SDT偏移指针,该解构的时隙交换器重置为帧处理的开始,由此对准由TSI与所接收的帧形成的帧。 该解构检测通话TDM总线上TDM帧,并同步(对准)由TSI与谈话TDM总线上的TDM帧形成的帧的传输的发生。 清单和谈话TDM总线从而海誓山盟同步。