tw4ld6 发表于 2024-8-31 07:34:19

航空电子设备中的TSN通讯架构—直升机


    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gKRUbKARzS3wBNr8H4gyazUlFMc6LibianOkbfwpz8sKgPHCrVfh0mtnia8micGdgcDiaF5R3727tazL5A/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <h2 style="color: black; text-align: left; margin-bottom: 10px;"><span style="color: black;"><strong style="color: blue;"><strong style="color: blue;"><span style="color: black;">前言</span></strong></strong></span></h2>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">以太网正在<span style="color: black;">快速</span>取代传统网络,<span style="color: black;">作为</span>航空电子设备和任务系统的核心高速网络。本文提出了以太网时间<span style="color: black;">敏锐</span>网络(TSN)在航空电子设备上应用的技术<span style="color: black;">优良</span>问题。在<span style="color: black;">实质</span>应用中,TSN已<span style="color: black;">作为</span>一个<span style="color: black;">拥有</span>丰富的机制和协议的工具箱,可满足与时间和<span style="color: black;">靠谱</span>性<span style="color: black;">关联</span>的QoS<span style="color: black;">需求</span>,<span style="color: black;">因此呢</span>TSN是汽车、工业4.0和电信等各应用<span style="color: black;">行业</span>中有线高速通信的重要技术。<span style="color: black;">这里</span>背景下,本案例<span style="color: black;">重点</span>呈现TSN<span style="color: black;">按时</span>QoS机制在直升机航空电子设备和任务系统中的应用。</span></p>
    <h2 style="color: black; text-align: left; margin-bottom: 10px;"><span style="color: black;"><strong style="color: blue;"><strong style="color: blue;"><span style="color: black;">案例概述</span></strong></strong></span></h2>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">本案例<span style="color: black;">科研</span>是基于空客直升机<span style="color: black;">机构</span><span style="color: black;">供给</span>的TSN通信架构原型案例。案例的<span style="color: black;">第1</span>部分<span style="color: black;">重点</span>阐述与直升机航空电子设备和任务网络<span style="color: black;">关联</span>的TSN标准,尤其是数据传输的实时性。第二部分是<span style="color: black;">评定</span>在下一代系统子集的现实网络中,TSN<span style="color: black;">按时</span>QoS核心机制<span style="color: black;">怎样</span><span style="color: black;">加强</span>在调度最大流数量过程中的效率。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;"><span style="color: black;">1、</span>以太网TSN<span style="color: black;">按时</span>QoS机制与标准</span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">拥有</span>QoS<span style="color: black;">保准</span>的实时通信<span style="color: black;">针对</span><span style="color: black;">有些</span>航空航天嵌入式系统(如直升机)<span style="color: black;">来讲</span>是必不可少的。IEEE 802.1 TSN TG(时间<span style="color: black;">敏锐</span>网络技术小组),<span style="color: black;">研发</span>了与时间和<span style="color: black;">靠谱</span>性<span style="color: black;">关联</span>的QoS<span style="color: black;">需求</span>的技术。IEEE 802.1协议簇(WG)为交换以太网制定标准。这些标准中定义的机制和协议依赖于数据链路层<span style="color: black;">供给</span>的服务,如时间同步、网络配置和管理以及QoS等特性。本案例中将<span style="color: black;">重点</span>探讨网络的实时性<span style="color: black;">需求</span>以及分析<span style="color: black;">供给</span><span style="color: black;">按时</span>QoS的TSN机制。</p>

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">IEEE802.1Q(TSN)中的<span style="color: black;">按时</span>QoS</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">实时通信系统中最重要的<span style="color: black;">需求</span>之一是<span style="color: black;">保准</span>延迟有边界。<span style="color: black;">咱们</span>将帧从发送方<span style="color: black;">经过</span>网络到接收方所花费的时间<span style="color: black;">叫作</span>为延迟。在有实时<span style="color: black;">需要</span>的网络中,<span style="color: black;">例如</span>直升机,数据流的延迟<span style="color: black;">一般</span>有一个最大容忍值,<span style="color: black;">亦</span><span style="color: black;">便是</span>说,它们会受到截止时间的限制。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwF90ZkQrGK6rJBliaqY59sADCibAAN4x7NUCZPSq55MrdW2OVkfsGGYUw/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">802.1Q中的<span style="color: black;">按时</span>QoS:严格的优先等级</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">流量优先级映射到流类别(TC)一共有8个等级,<span style="color: black;">而后</span><span style="color: black;">按照</span>流的类别<span style="color: black;">选取</span>流进行传输。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwsdA58wQlwc4O32XNGiawnDMjicrx3WGbWYKLa3ugoYqBib1m8stZMXdRQ/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">+充分的优先级分配能<span style="color: black;">保准</span>按时完成任务。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">–不能改变流量阻塞的损失。</p>–延迟可能不够低。

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">802.1Q中的<span style="color: black;">按时</span>QoS:基于信用的整形器-CBS</p>

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">基于信用的传输管理:</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">• 仅当信用值&gt;0时才<span style="color: black;">准许</span>传输。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">• 当前正在传输的Traffic Class(TC)的信用值在传输时会减少,其他未传输的Traffic Class<span style="color: black;">(TC)</span>信用值会<span style="color: black;">增多</span>。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZw3F2QbYvTHfR8wZwTKc7neFFhZJeNECnIb7n9YDMlG0EcoIEHXDwYicg/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">+充足的配置能<span style="color: black;">保准</span>按时完成任务。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">+防止低优先级流量的阻塞</p>–延迟可能不够低。

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">802.1Q中的<span style="color: black;">按时</span>QoS:调度流量</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">为<span style="color: black;">每一个</span>TC分配一个<span style="color: black;">规律</span>门。仅当门打开时才<span style="color: black;">准许</span>传输。门的打开和关闭由预先定义的时间表<span style="color: black;">掌控</span>。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwqKEVYiaGw1FbkvgKfIQdAfOLqxiagCVxulWyLNxqV05DxLpTS2KGb8ibQ/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">+充足的调度降低延迟和抖动</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">–生成正确的调度表可能是一个<span style="color: black;">繁杂</span>的算法问题</p>–带宽可能未得到充分利用

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwnhkREf7hVIPkeOjpqkJW4p0eqlT9Zo9eQ1aibINZg8aCREGReWqPJLA/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">TC#3的帧已准备好传输并且其门已打开,但<span style="color: black;">无</span>足够的时间来传输完整的<span style="color: black;">信息</span></p>

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">802.1Q中的<span style="color: black;">按时</span>QoS:帧抢占</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">较低优先级的帧<span style="color: black;">能够</span>被较高优先级的帧抢占。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwV5DaXO3KiavYD0lXWQD7V9J3qB1ISmg8Pl7ITqe7LNGbiaMu7KQqFT4Q/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">TC#3的帧已准备好传输并且其门已打开,但<span style="color: black;">无</span>足够的时间来传输完整的<span style="color: black;">信息</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">+<span style="color: black;">能够</span>改善延迟</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">+与以下<span style="color: black;">一块</span><span style="color: black;">运用</span>预定流量优化带宽利用率</p>–硬件实施并不简单

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">总结</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwXpO94s2sPNnjoJuC6mibFH6Mv7afngoNia8dczBU7zYhudLngoXEYjGg/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">航空航天TSN配置文件</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">IEEE802.1和SAE航空电子网络AS-1A2的联合工作。TSN配置文件:<span style="color: black;">选取</span>机制和配置以满足用例<span style="color: black;">需求</span>。<span style="color: black;">日前</span><span style="color: black;">处在</span><span style="color: black;">研发</span>的</span><span style="color: black;"><span style="color: black;">初期</span><span style="color: black;">周期</span>。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">该标准为确定性IEEE802.3以太网的设计者、实施者、集成商和认证<span style="color: black;">公司</span>指定了配置文件,支持广泛的航空航天机载应用,<span style="color: black;">包含</span><span style="color: black;">哪些</span>需要安全性、高可用性性和<span style="color: black;">靠谱</span>性、可<span style="color: black;">守护</span>性和有限延迟的应用。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;"><span style="color: black;">2、</span>TSN调度机制的效率</span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">本案例下半部分<span style="color: black;">重点</span>与任务方面<span style="color: black;">相关</span>。案例中<span style="color: black;">评定</span>了不同TSN机制在网络负载增长时满足时序约束的相对能力,还量化了不同调度<span style="color: black;">处理</span><span style="color: black;">方法</span>的内存<span style="color: black;">运用</span><span style="color: black;">状况</span>,<span style="color: black;">包括</span>1000个流的特定应用程序。所有实验均<span style="color: black;">运用</span>软件RTaW‑Pegase进行。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">机载TSN网络模型</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">该通信体系结构由两个在多个终端系统上相互连接的子网络<span style="color: black;">构成</span>。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">上层网络:具<span style="color: black;">相关</span>键流的核心航空电子设备→<span style="color: black;">科研</span>重点</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwJxjWa6QqOqcnoeQ0k8VbYrgqJb8MRKichr3K1HtE5YWOxGU9hL9L33w/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">下层网络:<span style="color: black;">重点</span>是任务</p>

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwHtJ5icuyN67zmq27ufQrEtJEtllfpgxOPDvtia94YficAUlwqsMicXicZ7w/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">定量<span style="color: black;">评定</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwOgZP16sQercvosE9LNPRz88EWCibPZ5DE56OKoBiakFreSJwLvaJ1GDA/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">• 技术:模拟、最坏<span style="color: black;">状况</span>分析、设计空间探索系统、合成数据</p>• 候选TSN调度<span style="color: black;">处理</span><span style="color: black;">方法</span>:整形、时间触发传输、抢占、手动(“用户优先级”)和自动流优先级分配(“简明优先事项”)

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">过载分析:在某些链路<span style="color: black;">显现</span>过载之前有多少个流?</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">该通信体系结构由两个在多个终端系统上相互连接的子网络<span style="color: black;">构成</span>。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">上层网络:具<span style="color: black;">相关</span>键流的核心航空电子设备→<span style="color: black;">科研</span>重点</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwZDOStM9Ivzw7IsQJbI8umDNk3mhoCEHKlmN5Lsl0LrZdOzvhwaBgFQ/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">流数量</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">• </span>
      </span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">超过7000个流,<span style="color: black;">最少</span>一条链路过载的概率急剧<span style="color: black;">增多</span> →网络容量上限</p><span style="color: black;">• </span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">显示</span>网络容量很重要,截止日期等于周期</p>

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">拓扑压力测试®(TST):</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwLJGuRS1YQjibc1vE6y81gdHAPZjPIlGKicT7LKjOGTUKwPQbmF4Oj3hA/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">流数量</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">上图为<span style="color: black;">运用</span>软件RTaW-Pegase执行拓扑压力测试®(TST)<span style="color: black;">得到</span>的数据。在TSN<span style="color: black;">处理</span><span style="color: black;">方法</span>中成功调度<span style="color: black;">必定</span>数量的流的概率,<span style="color: black;">拥有</span>7000个流的系统有89%的概率可<span style="color: black;">经过</span>CP进行调度。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">• </span>
      </span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">Concise Priorities(CP)的性能接近最佳,<span style="color: black;">由于</span>它调度了99%的非过载配置</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">→整形、时间触发传输或帧抢占<span style="color: black;">无</span>增益</p><span style="color: black;">• </span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">FIFO调度优于“用户优先级”,后者利用了6个优先级!最大限度内存<span style="color: black;">运用</span>:<span style="color: black;">思虑</span>中等规模的1000个流网络</p>

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">最大限度内存<span style="color: black;">运用</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">思虑</span>中等规模的1000个流网络</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZw7B898MZCibTvibXA6uAV4aJGZnZ6wKQqBwWjymzcOT4smiayWe6414D1w/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">出口端口(接口、交换机)</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">• </span>
      </span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">整形(此处由软件实现的预整形)在本案例<span style="color: black;">科研</span>中将平均内存<span style="color: black;">运用</span>量减少了80% </p><span style="color: black;">• </span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">每一个</span>开关的总内存高达 568KB未整形 168KB带整形</p><span style="color: black;">• </span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">优先级的设置不会减少FIFO存储器<span style="color: black;">运用</span>内存</p><span style="color: black;">• </span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">CBS在记忆性方面<span style="color: black;">亦</span>表现得非常好。此处未<span style="color: black;">运用</span>CBS ,<span style="color: black;">由于</span>优先级分配算法未针对CBS进行优化。</p>

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">结论</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">• </span>
      </span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">并非所有系统都<span style="color: black;">触及</span>到TSN中的所有标准(如本案例<span style="color: black;">科研</span>所示) </p><span style="color: black;">• </span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">战略位置好的策略匹配机制能<span style="color: black;">提高</span>成本效益 </p><span style="color: black;">• </span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">TSN策略机制的<span style="color: black;">选取</span>:关键影响<span style="color: black;">原因</span>有<span style="color: black;">那些</span>?</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">- 更高优先级的流量→<span style="color: black;">能够</span><span style="color: black;">选取</span>流量整形</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">- 较低优先级流量→<span style="color: black;">能够</span><span style="color: black;">选取</span>由时间触发的流量传输或抢占 </p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">- 相同优先级流量→<span style="color: black;">能够</span>设置更多优先级,更好的优先级分配和流量整形</p><span style="color: black;">• </span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">在本案例中,优先级是计时所需的<span style="color: black;">独一</span>QoS机制 </p><span style="color: black;">• </span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">内存和时间<span style="color: black;">同样</span>都会对流量产生限制,流量整形确实是有效的</p><span style="color: black;">• </span>非纯粹的技术问题,例如重量、成本和认证工作等<span style="color: black;">亦</span>要<span style="color: black;">思虑</span>在内
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">认识</span><span style="color: black;">关联</span></span><span style="color: black;"><strong style="color: blue;">技术信息</strong>及<strong style="color: blue;">商务服务</strong>,请<span style="color: black;">拜访</span></span><span style="color: black;">http://www.softtest.cn/</span><span style="color: black;"><span style="color: black;">留言,或按以下方式联系</span><strong style="color: blue;"><span style="color: black;">旋极智能</span></strong><span style="color: black;">:</span></span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/HfqCJKcX6gLH1ZXG5sKMfNelZRJibajZwbeOqibfjg3cyRJSO6bp32IG2ibvRFdaQnubqkBRFicGU2WIpj10viaUsvQ/640?wx_fmt=jpeg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>&nbsp;&nbsp;<span style="color: black;">往 期 推 荐</span>&nbsp;&nbsp;<a style="color: black;"><span style="color: black;">TSN:轨道交通<span style="color: black;">行业</span>首选的新一代通信数据链路层</span></a><a style="color: black;"><span style="color: black;">铁路案例</span></a><a style="color: black;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/Co54gLLWtzfQv0N7j2Sib1sQwRHU0g5Xqeic1qVlLAzo7MlpB8nQic1EDm4ePjrkmXNTdJLwic8snuWKxLre6gl1xA/640?wx_fmt=jpeg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></a><a style="color: black;"><span style="color: black;">TSN流量记录器:验证汽车网络中的以太网聚合,经济<span style="color: black;">有效</span>的<span style="color: black;">处理</span><span style="color: black;">方法</span></span></a><a style="color: black;"><span style="color: black;">TSN总线</span></a><a style="color: black;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/Co54gLLWtzfQv0N7j2Sib1sQwRHU0g5Xqv6Xicz5ns1gTqIskb5Gxe1qV26EzbkgibgHjC1SmXm0Y8xfic7VtfgCiaQ/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></a><a style="color: black;"><span style="color: black;">深耕航空事业25载,旋极与业界同仁共谱航电新篇</span></a>章<a style="color: black;"><span style="color: black;">航电会议</span></a><a style="color: black;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/mmbiz_jpg/Co54gLLWtzcod5lIMBuMdXrnghP1fHnClmiaibnweNibIsjUmKSapkV0tw1oBsrR7Hg5kyOxG8mhaHiaiaRPibmBpJSA/640?wx_fmt=jpeg&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></a>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">E</span></strong><strong style="color: blue;"><span style="color: black;">nd</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">“以人为本,创新先行”</span></p>
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    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">&nbsp; 阅读原文,</span></strong></span><strong style="color: blue;"><span style="color: black;">获取<span style="color: black;">更加多</span><span style="color: black;">新闻</span></span></strong>&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: black;"><strong style="color: blue;"><span style="color: black;"><strong style="color: blue;">点在看,支持旋极智能</strong><span style="color: black;"><strong style="color: blue;"> ☟</strong></span></span></strong></span></p>




1fy07h 发表于 2024-10-7 12:48:32

楼主节操掉了,还不快捡起来!

4lqedz 发表于 2024-10-21 12:28:43

外链论坛的成功举办,是与各位领导、同仁们的关怀和支持分不开的。在此,我谨代表公司向关心和支持论坛的各界人士表示最衷心的感谢!

wrjc1hod 发表于 2024-11-5 14:53:28

论坛外链网http://www.fok120.com/

4lqedz 发表于 2024-11-5 15:19:26

外链论坛的成功举办,是与各位领导、同仁们的关怀和支持分不开的。在此,我谨代表公司向关心和支持论坛的各界人士表示最衷心的感谢!

4lqedz 发表于 2024-11-9 17:15:28

感谢你的精彩评论,为我的思绪打开了新的窗口。
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