第33章 闭环
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第33章闭环(第1/2页)
七点三十分,围挡区配电箱的盒子准时发出了确认信号。信号波形在频谱仪屏幕上出现了一组规律的脉冲序列,持续约三秒后结束。顾晏在旁边同步记录了信号的完整波形,将它与之前从物流园中继器捕获的通信样本做了对比,确认了信号格式的一致性。
“确认信号已发出,时间窗口和格式都符合预期。“顾晏把波形记录保存下来,“如果廖维今天没有特殊安排,这个信号就是他确认盒子状态正常的方式。“
陆维桢站在操作台侧面,目光在沿海备用车的GPS坐标和车辆行驶方向之间来回切换。备用车的信号显示它已经离开了最后一个服务区,正在向沿海方向行驶。按照当前速度,它将在上午十点左右进入沿海城区的范围。如果这辆备用车上载有从蓉城转运出来的数据设备,那么它的到达时间和物流公司常规的转运周期是吻合的。
周承岳从大厅入口方向走近,手机屏幕亮着,上面是一份刚收到的协调计划草案。“沿海那边的人已经在贸易公司注册地址附近做好了信号监测准备。专线链路如果被切断,他们能在三十秒内确认链路状态变化。物流车队的追踪组也已经锁定了那辆备用车的实时位置。“
“备用车到达沿海城区之后,它优先去的地方是那家贸易公司的注册地址还是枢纽楼?“陆维桢问。
周承岳低头看了一眼手机上的反馈消息,然后抬头说:“目前没有确切的路线规划。但从上一辆白色面包车的行驶记录来看,它在到达沿海城区后先停靠了贸易公司注册地址所在的那条街道,然后才去了枢纽楼。可能是两处地点都需要停留。“
陆维桢在脑海里把两处地点的时间顺序过了一遍。贸易公司的注册地址和枢纽楼相距约两公里,如果车辆需要在两处分别停留,每次停留时间不会太长——应该只是放下或者取走某样东西。可能贸易公司地址处存放的是旧的数据存储介质,而枢纽楼负责将新数据送出境。备用车到达后,先到贸易公司放下旧的介质,然后到枢纽楼接驳新的传输流程。
“旧介质被替换下来后可能要回收。“陆维桢说,“物流公司不只是单向运送数据,它也在循环使用存储介质。车辆到达沿海后把旧卡取下来放在贸易公司那边,然后带一批新卡回蓉城继续使用。所以备用车到贸易公司地址的停留时间用于回收旧卡,到枢纽楼的停留用于送出新数据。“
周承岳把这条逻辑快速整理成消息发给了沿海方向。大约两分钟之后他收到了回复,回复内容被精简成一行:“贸易公司地址和枢纽楼两处地点的行动可以同时执行。备用车在贸易公司地址停靠时截停车辆,同时切断专线——两个操作的时间差可以控制在一分钟以内。“
陆维桢在白板上的“沿海“节点下方添加了一条时间线。他在时间线上标注了备用车预计到达的时间窗口,然后画了两条平行的短箭头,分别指向“车辆截停“和“专线切断“两个操作标记。他在两个标记之间画了一条竖线连接,标注了“同步执行“。
“车辆截停后,车上带回蓉城的旧卡如果被取走,就能进一步确认蓉城和沿海之间的数据流动周期。“他说,“同时专线切断后,贸易公司那边的数据通道就断了,就算备用车上的新卡没被截住,数据也无法通过专线送出。“
顾晏一直站在操作台侧面没有坐下。她手里的频谱仪还开着,屏幕上持续显示着物流园中继器的信号状态。她看了一眼屏幕然后抬起头来,看向陆维桢的方向:“物流园中继器的轮询周期是常规循环,但它的主频边沿有一组从昨天开始出现的微幅波动。波动的周期和备用车的位置更新频率接近,可能在通过中继器同步备用车的状态信息。“
“中继器在监控车辆状态。“陆维桢转过身来,“物流园中继器不只是接收和转存数据——它还在跟踪物流公司车辆的实时位置。备用车的GPS信号可能被中继器同时读取并存储了一份。如果我们截停了备用车,中继器会在下一次心跳信号中检测到车辆位置不再更新,然后触发异常状态。“
(本章未完,请点击下一页继续阅读)第33章闭环(第2/2页)
他快速走到操作台前坐下,打开了物流园中继器的远程访问界面。利用之前从物流园中继器存储卡上获取的协议样本,他向中继器的管理端口发送了一条“车辆状态确认“的查询指令。几秒后中继器返回了一个数据包,包里包含了一组GPS坐标序列——备用车过去四小时的行驶轨迹,位置更新频率均匀,最后一次更新时间在几分钟前。
“中继器确实在监控车辆位置。“陆维桢把返回的数据包保存下来,“截停备用车的同时需要处理掉中继器里的车辆定位跟踪数据。否则中继器会在备用车停靠后约十五分钟内向主控端发送车辆异常的警报。“
周承岳立刻接上了这句话:“处理中继器数据需要多少时间?“
“从发送清除指令到数据被覆盖完成,大约需要五到八秒。“陆维桢看了一眼物流园中继器的操作界面,“清除指令的格式和常规数据回传指令相似,只需要把目标字段替换成中继器存储区的缓存地址即可。我可以在备用车截停的同时远程发送清除指令,把车辆跟踪数据从它的缓存中覆盖掉。“
他低头在键盘上快速编写了一条针对中继器缓存的清除指令,把指令格式和物流园中继器支持的协议版本做了最后一次确认。保存好之后他抬头看了一眼墙上的时钟——八点零七分。
“备用车预计到达沿海城区的时间在十点到十点半之间。“陆维桢说,“距现在还有大约两个小时。这段时间内我需要确认清除指令是否会触发中继器自身的安全告警机制。如果会,就需要在发送清除指令之前做一次协议层的掩盖。“
顾晏端着频谱仪的探头靠近工作站的天线接口,联机读取了物流园中继器的底层协议状态。她的目光扫过屏幕上展开的协议栈分段图,用一只手在键盘上快速敲击了几行指令,然后松开手让结果自己运行。几秒后,屏幕上的协议栈被折叠成了一行简洁的状态摘要,摘要末尾标着两行小字:“清除指令对中继器主控协议来说属于常规系统维护指令序列的一部分,不会触发单独的安全告警。主控端只有在收不到预期心跳信号时才会启动检查流程,而清除指令本身不改变心跳信号的发送间隔。“
陆维桢把那行摘要内容记在了笔记本上。他站起来重新面向白板,在“车辆截停“和“专线切断“两个标记旁边各添了一个小字:“清缓存“和“断链路“。四个操作形成一个闭环,在时间线上并列排开。然后用一条线把它们全部框在一起,在线框的末尾写了两个字:“九点五十——行动启动倒计时。“
他把笔放下,退后一步,看着白板上那个完整的操作计划图。所有节点都在上面了——从蓉城研究所内部的光纤分流口开始,经过弱电间、会议室、围挡区、公交站台、物流园,通过物流公司的车辆体系延伸到沿海城市,再通过贸易公司的专线出境。链条上的每一个点现在都被识别并且对应了具体的切断或清除措施。整条线将在今天上午十点左右被同时打断,从中间和末端两个方向同时施加切断力,使链条无法形成完整的回路。
光屏在他的视野里亮了一行字,字体比以前明亮,边缘带着一丝淡蓝的辉光:“建议在行动开始前再次确认备用车的位置及其是否载有原定从蓉城转运的数据设备。如果备用车只是空车补给,截停行动的意义会降低。“陆维桢没有抬头,他的目光落在白板上的全图上。那条从蓉城延伸出去直到港口的线条,每一个节点都对应着他亲手标注的内容和记录。他盯着那个锚点看了几秒钟,然后视线向下移到了操作台上的海岸线地图上,地图上沿海城市那片灰色建筑群的轮廓在屏幕光线下显得清晰可见,灰色的屋顶连成一排延伸向港口的方向。
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