It introduces the architecture of the switch , hol , delay control , vlan and spanning - tree algorithm , and crossbar backplane and store - and - forward technology 介绍了线头阻塞、时延控制、虚拟局域网和生成树算法等概念以及交换机的交换矩阵和共享存储器等关键技术。
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A book showing 224 windmills from hol - land is presented in leidschendam , the netherlands , 02 november 2007 . the or - ganizers wish the event mentioned in the world guiness book of records for the longest graph 11月2日，荷兰莱顿，人们正在展示含有224座荷兰风车的图书。这本书的内容被展示在140米长的画卷上。组织者希望这能够成为吉尼斯世界纪录中最长的画卷。
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The approach combines hop - by - hop selective backpressure scheme with hol protection to eliminate congestion and improve performance of switched ethernet l2 domains instead of random early drop ( red ) scheme or its variants considering the characteristics of ethernet technique 基于ieee802 . 1p和802 . 1q的队列机制，采用逐跳选择式背压流控机制和头端阻塞保护机制消除拥塞，改善系统性能。
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In the optimization design of advanced router , since it exists hol blocking in iq program , and when the number of ports is large or the line rate is very high , the present memory cannot have so fast frequency in oq program , so cioq program is adopted now 在路由器的优化设计中，由于输入端排队方案存在队首堵塞且输出端排队方案在主干网上存在加速过高而现有的内存频率跟不上的弊端，所以现在采用了组合输入输出端排队方案。
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Because of block in head of line ( hol ) , input buffer strategy make the whole switch system performances declining drastically at heavy oflbred load , and some improvements of input buffer strategy are put forward to overcoming tlle head of line block . virtual output queues ( voq ) is chosen as input buffer strategy . dpa and ilqf ce1l scheduling algorithms for voq are silllulated 由于输入缓存的队头阻塞使得高负载条件下输入缓存策略的交换系统各方面性能急剧下降，由此提出了克服输入缓存队头阻塞的改进方法，最后本文决定选用虚拟输出队列( voq )的输入缓存策略，并且研究了与虚拟输出队列相对应的ilqf (最长队列优先)和dpa (对角线优先)信元调度算法，为交换系统的asic设计提供依据。
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With the setting of the peculiar conditions , we contribute the above system model for the first time to a kendall model , i . e . / l , : the size of buffer 1 / fcfs ( for same kinds of cells ) / l2 : the size of buffer 2 / non - prevail pr ( for different kinds of cells ) we resolved the model by " state transfer " method 在设定工作环境及条件的基础上，本论文首次为该系统模型建立了肯达尔排队模型。即：并运用状态转移方法进行了解析。最后的模拟实验数据表明优先级调度输入?线群多通道输出atm交换系统模型较好地改善了hol阻塞，提高了输入排队atm交换网络的性能。
