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Industrial-grade 4G router TCP/IP network architecture 1. Layering of TCP/IP network system   TCP/IP (TransmissionControlProtocol/InternetProtocol), transmission control protocol/Internet protocol. It was developed by the defense advanced research projects agency in the 1970s, and was later integrated into UNIX and popularized. It emerged in the 1980s as the Internet's...

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The structure of 4G DTU The main function of DTU is to transmit data from remote devices back to the background center via wired/wireless. Different data transmission modes of DTU include all-network-connected DTU, GPRS DTU, WIFI DTU, CAN DTU and 4G DTU. Today, we will have a look at the structure and work flow of DTU.   To complete...

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What are the wireless connection technologies of the... Internet of things (iot) applications have been deeply rooted in our lives. The E-Lins H685 industrial-grade router is a small industrial-grade wireless router with single or double LAN ports. TDD/ fdd-lte, 4G, 3G, GPRS network optional. Besides, what are the wireless connectivity technologies for the Internet of things?   1....

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The use of industrial wireless routers Industrial-grade wireless router adopts high performance 32-bit industrial-grade ARM9 communication processor, which is widely used in finance, electric power, postal, water conservancy, environmental protection, meteorology and other industries.   Industrial router is mainly used in intelligent transportation,...

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Cascade and stack of industrial-grade 4G routers The most basic star Ethernet architecture, the actual star enterprise network may be much more complex than this. This renaturation is not only reflected in how high-end network equipment, how complex configuration, more importantly, the performance of network switching level is more complex. Industrial routers and firewalls...

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工业路由器使用Hello分组来建立和维护节点的邻接关系

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  OSPF协议使用Hello分组来建立和维护节点的邻接关系。邻接关系是运行OSPF协议的工业EVDO路由器交换路由和选择数据的基础。运行OSPF协议的工业路由器只有通过Hello分组才能发现本区域中其他OSPF协议节点。工业路由器通过交换Hello分组在邻接节点间建立通信。Hello分组通过在OSPF协议分组头后附加内容来定义一系列子分组结构。这些子分组统称Hello分组。

  Hello分组通过在运行OSPF协议的接口上启动多播传输来发送。根据RFC1700和RFC2328,Hello分组的目的地址是所有OSPF路由器:224.0.0.5。该多播地址对应的以太网链路层MAC地址是0×01-00-5e-00-00-06.采用多播传输而不是广播传输可以使局域网上非OSPF节点免受OSPF协议数据干扰。

  在缺省条件下,Hello分组每10s发送一次。该发送间隔可以协商。定期发送的Hello分组用作心跳:告诉网络上其他工业TD-LTE路由器该OSPF路由器接口处于活跃状态。如果OSPF节点连续4次无法发送Hello分组,则所有邻居会认为该OSPF节点已瘫痪。在缺省条件下,邻接关系取消时间为4*10s=40s。

  标签:无线路由器   4g无线路由器

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