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Characteristics and differences between RS485 and RS232 RS232 and RS485 have always been the weak current common interface, but there are a lot of people do not understand the difference between them is not very thorough.   I. overview of RS485   RS-485 serial bus is widely used when the communication distance is tens of meters to thousands of meters. RS-485...

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What is M2M? As is known to all, besides providing more broadband speed and quality, 5G is characterized by the application of the Internet of things (IoT) from the demand and design stage. In order to adapt to different applications, mobile communication technology with no wiring, high coverage and high reusability has become an important...

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The similarities and differences between industrial... 1. definition of industrial 4G router and industrial switch   Industrial 4G router:   Industrial 4G router is a network device responsible for path finding. It provides users with communication by finding the least communication from multiple paths in the interconnection network. Industrial 4G router...

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4g router features of E-lins Technology With the development of new communication technologies and the continuous improvement of network efficiency and function of wireless communication, 4G has been widely used. 4G industrial-grade wireless routers are playing an increasingly important role in the applications of various industries, and the price is getting...

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E-Lins Industrial router applications Industrial-grade routers as Internet network layer communication equipment application in all walks of life, brought a lot of convenience for our industry. "E-Lins" introduce the application of industrial router scenario analysis.   1 The self-service terminal network   E-lins industrial router networking...

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Dual SIM industrial router H750 Quick Start

Category : 产品文章, 伊林思产品FAQ, 技术相关

Before Installation and Configuration

  1. H750 router has different version. Study your router version before installation.
  2. For GSM/GPRS/EDGE/HSDPA/HSUPA/HSPA/HSPA+/4G LTE version, please get a SIM card with data business.
  3. For CDMA2000 EVDO/CDMA1x version, please get a UIM card with data business or inform us before order if the network uses non-ruim (nam-flashing).
  4. Make sure the sim card or uim card is with enough data business and balance.
  5. Make sure the signal is good enough where you test or install the router. Weak signal will make the router no work. If you find your signal strength is not good, please contact us for high gain antenna.

Notes: This quick start is for GSM/GPRS/EDGE/HSDPA/HSUPA/HSPA+/TD-SCDMA network only. For EVDO network or CDMA network, please refer to manual or contact us freely.

Step 1) Confirm the sim card if can work with other 2G/3G/4G router or modem. If the sim card can not work, the router will not work correctly.

Step 2) Connect the H750 Router LAN port to a PC via RJ45 cable. Make the PC automatically to get the IP, Submask, DNS.

The PC will get an IP of 192.168.8.xxx.

Step 3) At PC IE browser, please type: http://192.168.8.1

Username: admin      Password: admin

Step 4) Internet Settings – WAN – Cell Modem

Notes:

  • If you don’t replace any cellular module or not do the “Load Default to factory”, please skip this step and jump to Step 5.
  • Please be patient that the router will take some more time to dialup online for first configuration,

At “Cell Modem”, please select “AUTO_DETECT”, and click “Apply” button. The router will automatically detect the module modem.

Step 5) Set Cell SIM1

Setting location: H750 web “Internet Settings – WAN – APN configuration”

Click “Advance Parameter Groups” button, the H750 router will display the configuration page.

Fill in the related parameters. And DO NOT FORGET TO CLICK “Add/Edit” button.

Parameters Groups Name: you can fill in the name freely. But keep No Space between characters.

Dialup: fill in the related parameters. Get this parameter from the Sim Card Provider or Carrier;

APN: fill in the related parameters. Get this parameter from the Sim Card Provider or Carrier;

User: fill in the related parameters. Get this parameter from the Sim Card Provider or Carrier.
Notes: If your SIM card has no user name, please input out default value, otherwise the router may not dialup. Our default value for GSM/WCDMA/LTE is “wap”, and for CDMA/EVDO is “card”.

Password: fill in the related parameters. Get this parameter from the Sim Card Provider or Carrier.
Notes: If your SIM card has no user name, please input out default value, otherwise the router may not dialup. Our default value for GSM/WCDMA/LTE is “wap”, and for CDMA/EVDO is “card”.

 

Step 6) Set Cell SIM2. Follow Step 6 of setting Cell SIM1.

Step 7) Activate the “Cell SIM Switching Trigger” feature

Setting location: H750 web: Internet Settings – WAN — All Cell Option

There are 6 types of Cell Option Mode (Cell Switching Mode),

Mode Description
cell1 only With this mode, only sim1 works
cell2 only With this mode, only sim2 works
fail switch cell1 first With this mode, it works as below,
sim1 on – switch to sim2 on if sim1 failed, and keep working on sim2 – switch to sim1 on if sim2 failed, and keep working on sim1 –switch to sim2 on if sim1 failed, and keep working on sim2 – “cycling”
fail switch cell2 first With this mode, it works as below,
sim2 on – switch to sim1 on if sim2 failed, and keep working on sim1 – switch to sim2 on if sim1 failed, and keep working on sim2 –switch to sim1 on if sim2 failed, and keep working on sim1 – “cycling”
cell1 prefer With this mode, it works as below,
sim1 on – keep working on sim1 – if sim1 failed, switch to sim2 – keep working on sim2 for “Check Time (for Prefer mode)”, then try to check if sim1 is restored, if restored, switch to sim1 – “cycling”
cell2 prefer With this mode, it works as below,
sim2 on – keep working on sim2 – if sim1 failed, switch to sim1 – keep working on sim1 for “Check Time (for Prefer mode)”, then try to check if sim2 is restored, if restored, switch to sim2 – “cycling”
advance data traffic cell1 first With this mode, it works as below,
sim1 and sim2 have data limits. Sim1 on — once sim1 data count reaches the limitation, switch to sim2 — once sim2 data count reaches the limitation, sim1 and sim2 neither works until next day/week/month.With this mode, users need set the “Advance Cell Traffic” configuration
advance data traffic cell2 first With this mode, it works as below,
sim1 and sim2 have data limits. Sim2 on — once sim2 data count reaches the limitation, switch to sim1 — once sim1 data count reaches the limitation, sim1 and sim2 neither works until next day/week/month.With this mode, users need set the “Advance Cell Traffic” configuration. Refer to the detailed manuals from E-Lins.
cell on time traffic Sim1 and sim2 work according the time period schedule settings.

With this mode, users need set the “Advance Cell Traffic” configuration. Refer to the detailed manuals from E-Lins.

Notes: Sometimes it may happen the following,
1) Choosing ” fail switch cell1 first” or “cell1 prefer”, SIM2 is firstly online, this is not problem because sometimes the SIM1 has some problem to be online.

2) Choosing ” fail switch cell2 first” or “cell2 prefer”, SIM1 is firstly online, this is not problem because sometimes the SIM2 has some problem to be online.

Check Time (for Prefer mode): set the time for “cell1 prefer mode” or “cell2 prefer mode”

Description for Check Time (for Prefer mode):
For example1, Cell Option Mode is “cell1 prefer”, and Check Time (for Prefer mode) is “5” minutes. It works as below,
Router works with sim1 firstly — if sim1 failed, switch to sim2 — keep working on sim2 with 5 minutes — after 5 minutes, check if sim1 is ok, if ok, switch back to sim1.

For example2, Cell Option Mode is “cell2 prefer”, and Check Time (for Prefer mode) is “5” minutes. It works as below,
Router works with sim2 firstly — if sim2 failed, switch to sim1 — keep working on sim1 with 5 minutes — after 5 minutes, check if sim2 is ok, if ok, switch back to sim1.

Step 8) Click “View” button to double check if the settings are correct.

Step 9) Click “Apply” button or Re-power the router to reboot. Then H750 router will reboot and dialup online.

Once it’s online, the CELL LED will light on.
Notes: sometimes the router cannot dialup after the APN configuration, please power off the router, and re-power on it. Because some radio modules need reboot after the initial APN configuration.

Step 10) Once H750 router is online, it gets a WAN IP Address and Status Page will show similar info.

Step 11) Activate the “Cell ICMP Check” feature

Setting location: H750 web: Internet Settings – Cell ICMP Check

Notes:

1) For router working with best stability, we highly suggest activate and use this feature.

With this feature, the Router will automatically detect its working status and fix the problem.

2) Please disable the “Ping from WAN Filter” if use ICMP check feature, otherwise it cannot work.

 

  • Active: tick it to enable ICMP check feature
  • Check method: fill in checking domain name or IP. Click HOST/IP check button to verify before using it.
  • Check interval time (sec): set the interval time of every check
  • Check Count: set the checking count number
  • Reboot Count Before Sleep: H750 Router will sleep to stop checking after failed with set times.
  • Sleep Time (min): H750 Router sleep timing before resume check.

 

Example with above picture:

H750 Router check “www.google.com” and “112.134.8.8”, it will check 3 times. After the previous check, it will do next check after 60 seconds. Totally it will check 3 times. If 3 times all failed, H750 Router will reboot. If reboots 3 times continuously, H750 Router goes to sleep to stop checking. The sleep time is 5 minutes. After 5 minutes, H750 Router resumes to cycle the checking.

 

High Gain Antenna–Yagi-Uda Antenna

Category : 产品文章, 伊林思产品FAQ, 其他

Today, we are talking about high gain antennas. Here I want to introduce a strong one. A Yagi–Uda antenna, commonly known as a Yagi antenna, is a directional antenna consisting of multiple parallel elements in a line, usually half-wave dipoles made of metal rods.

Yagi–Uda antennas consist of a single driven element connected to the transmitter or receiver with a transmission line, and additional “parasitic elements” which are not connected to the transmitter or receiver: a so-called reflector and one or more directors.

The Yagi–Uda antenna consists of a number of parallel thin rod elements in a line, usually half-wave long, typically supported on a perpendicular crossbar or “boom” along their centers. There is a single driven element driven in the center (consisting of two rods each connected to one side of the transmission line), and a variable number of parasitic elements, a single reflector on one side and optionally one or more directors on the other side. The parasitic elements are not electrically connected to the transmitter or receiver, and serve as passive radiators, reradiating the radio waves to modify the radiation pattern. Typical spacings between elements vary from about  110 to ¼ of a wavelength, depending on the specific design. The directors are slightly shorter than the driven element, while the reflector(s) are slightly longer. The radiation pattern is unidirectional, with the main lobe along the axis perpendicular to the elements in the plane of the elements, off the end with the directors.

It’s also a good choice for you when you use E-Lins routers in rural area. This antenna will gain better reception than standard antennas for routers.

E-Lins New Product H820q —— 5 Powerful Wifi Antenna Assembling

Category : 产品文章, 伊林思产品FAQ, 其他

Best way to assemble H820Q wifi antenna

WiFi1—to 5Ghz Main;

WiFi2–to 5Ghz Aux

WiFi3–to 5Ghz Aux2(for special wifi module)

 

WiFi4–to 2.4Ghz Main

WiFi5–to 2.4Ghz Aux

 

 

IoT WORLD FORUM 2017

Category : 产品文章, 伊林思产品FAQ, 其他

Conference information:

IoT WORLD FORUM 2017 will be held in London, November 15-16 – 2017

IoT WORLD FORUM, 2017 is the world’s leading Internet of Things Conference 2017 focusing on IoT applications, IoT Solutions and IoT Companies for all verticals including automotive, healthcare, asset and fleet management, manufacturing, security, retail point of sales, smart grid, smart metering, smart home and consumer electronics industry.

For more information, please visit the event site here: http://iotinternetofthingsconference.com

E-LINS Router FAQ – - Config

Category : 产品文章, 伊林思产品FAQ, 其他

Q: If we have your routers how do we monitor them?
A: ythere are several types for monitor.
1) Web (local and remote)
2) SMS
3) SNMP
4) Telnet/SSH/CLI
5) Centre monitor server with E-Lins ODM software

The Development of 5G Network

Category : 产品文章, 伊林思产品FAQ, 其他

5G is the trend of the whole world, today I would like to share you the development of 5G network.
In 2008, the South Korean IT R&D program of “5G mobile communication systems based on beam-division multiple access and relays with group cooperation” was formed.
In 2012, the UK Government announced the establishment of a 5G Innovation Centre at the University of Surrey – the world’s first research centre set up specifically for 5G mobile research.
In 2012, NYU WIRELESS was established as a multidisciplinary research centre, with a focus on 5G wireless research, as well as its use in the medical and computer-science fields. The centre is funded by the National Science Foundation and a board of 10 major wireless companies (as of July 2014) that serve on the Industrial Affiliates board of the centre. NYU WIRELESS has conducted and published channel measurements that show that millimeter wave frequencies will be viable for multi-gigabit-per-second data rates for future 5G networks.
In 2012, the European Commission, under the lead of Neelie Kroes, committed 50 million euros for research to deliver 5G mobile technology by 2020. In particular, The METIS 2020 Project was the flagship project that allowed reaching a worldwide consensus on the requirements and key technology components of the 5G. Driven by several telecommunication companies, the METIS overall technical goal was to provide a system concept that supports 1,000 times higher mobile system spectral efficiency, compared to current LTE deployments. In addition, in 2013, another project has started, called 5GrEEn, linked to project METIS and focusing on the design of green 5G mobile networks. Here the goal is to develop guidelines for the definition of a new-generation network with particular emphasis on energy efficiency, sustainability and affordability.
In November 2012, a research project funded by the European Union under the ICT Programme FP7 was launched under the coordination of IMDEA Networks Institute (Madrid, Spain): i-JOIN (Interworking and JOINt Design of an Open Access and Backhaul Network Architecture for Small Cells based on Cloud Networks). iJOIN introduces the novel concept of the radio access network (RAN) as a service (RANaaS), where RAN functionality is flexibly centralized through an open IT platform based on a cloud infrastructure. iJOIN aims for a joint design and optimization of access and backhaul, operation and management algorithms, and architectural elements, integrating small cells, heterogeneous backhaul and centralized processing. Additionally to the development of technology candidates across PHY, MAC, and the network layer, iJOIN will study the requirements, constraints and implications for existing mobile networks, specifically 3GPP LTE-A.
In January 2013, a new EU project named CROWD (Connectivity management for eneRgy Optimised Wireless Dense networks) was launched under the technical supervision of IMDEA Networks Institute, to design sustainable networking and software solutions for the deployment of very dense, heterogeneous wireless networks. The project targets sustainability targeted in terms of cost effectiveness and energy efficiency. Very high density means 1000x higher than current density (users per square meter). Heterogeneity involves multiple dimensions, from coverage radius to technologies (4G/LTE vs. Wi-Fi), to deployments (planned vs. unplanned distribution of radio base stations and hot spots).
In September 2013, the Cyber-Physical System (CPS) Lab at Rutgers University, NJ, started to work on dynamic provisioning and allocation under the emerging cloud radio-access network (C-RAN). They have shown that the dynamic demand-aware provisioning in the cloud will decrease the energy consumption while increasing the resource utilization. They also have implemented a test bed for feasibility of C-RAN and developed new cloud-based techniques for interference cancellation. Their project is funded by the National Science Foundation.
In November 2013, Chinese telecom equipment vendor Huawei said it will invest $600 million in research for 5G technologies in the next five years. The company’s 5G research initiative does not include investment to productize 5G technologies for global telecom operators. Huawei will be testing 5G technology in Malta.
In 2015, Huawei and Ericsson are testing 5G-related technologies in rural areas in northern Netherlands.
In July 2015, the METIS-II and 5GNORMA European projects were launched. The METIS-II project builds on the successful METIS project and will develop the overall 5G radio access network design and to provide the technical enablers needed for an efficient integration and use of the various 5G technologies and components currently developed. METIS-II will also provide the 5G collaboration framework within 5G-PPP for a common evaluation of 5G radio access network concepts and prepare concerted action towards regulatory and standardization bodies. On the other hand, the key objective of 5G NORMA is to develop a conceptually novel, adaptive and future-proof 5G mobile network architecture. The architecture is enabling unprecedented levels of network customizability, ensuring stringent performance, security, cost and energy requirements to be met; as well as providing an API-driven architectural openness, fuelling economic growth through over-the-top innovation. With 5G NORMA, leading players in the mobile ecosystem aim to underpin Europe’s leadership position in 5G.
Additionally, in July 2015, the European research project mmMAGIC was launched. The mmMAGIC project will develop new concepts for mobile radio access technology (RAT) for mmwave band deployment. This is a key component in the 5G multi-RAT ecosystem and will be used as a foundation for global standardization. The project will enable ultra fast mobile broadband services for mobile users, supporting UHD/3D streaming, immersive applications and ultra-responsive cloud services. A new radio interface, including novel network management functions and architecture components will be designed taking as guidance 5G PPP’s KPI and exploiting the use of novel adaptive and cooperative beam-forming and tracking techniques to address the specific challenges of mm-wave mobile propagation. The ambition of the project is to pave the way for a European head start in 5G standards and to strengthen European competitiveness. The consortium brings together major infrastructure vendors, major European operators, leading research institutes and universities, measurement equipment vendors and one SME. mmMAGIC is led and coordinated by Samsung. Ericsson acts as technical manager while Intel, Fraunhofer HHI, Nokia, Huawei and Samsung will each lead one of the five technical work packages of the project.
In July 2015, IMDEA Networks launched the Xhaul project, as part of the European H2020 5G Public-Private Partnership (5G PPP). Xhaul will develop an adaptive, sharable, cost-efficient 5G transport network solution integrating the fronthaul and backhaul segments of the network. This transport network will flexibly interconnect distributed 5G radio access and core network functions, hosted on in-network cloud nodes. Xhaul will greatly simplify network operations despite growing technological diversity. It will hence enable system-wide optimisation of Quality of Service (QoS) and energy usage as well as network-aware application development. The Xhaul consortium comprises 21 partners including leading telecom industry vendors, operators, IT companies, small and medium-sized enterprises and academic institutions.
In July 2015, the European 5G research project Flex5Gware was launched. The objective of Flex5Gware is to deliver highly reconfigurable hardware (HW) platforms together with HW-agnostic software (SW) platforms targeting both network elements and devices and taking into account increased capacity, reduced energy footprint, as well as scalability and modularity, to enable a smooth transition from 4G mobile wireless systems to 5G. This will enable that 5G HW/SW platforms can meet the requirements imposed by the anticipated exponential growth in mobile data traffic (1000 fold increase) together with the large diversity of applications (from low bit-rate/power for M2M to interactive and high resolution applications).
In July 2015, the SUPERFLUIDITY project, part of the European H2020 Public-Private Partnership (5G PPP) and led by CNIT, an Italian inter-university consortium, was started. The SUPERFLUIDITY consortium comprises telcos and IT players for a total of 18 partners. In physics, superfluidity is a state in which matter behaves like a fluid with zero viscosity. The SUPERFLUIDITY project aims at achieving superfluidity in the Internet: the ability to instantiate services on-the-fly, run them anywhere in the network (core, aggregation, edge) and shift them transparently to different locations. The project tackles crucial shortcomings in today’s networks: long provisioning times, with wasteful over-provisioning used to meet variable demand; reliance on rigid and cost-ineffective hardware devices; daunting complexity emerging from three forms of heterogeneity: heterogeneous traffic and sources; heterogeneous services and needs; and heterogeneous access technologies, with multi-vendor network components. SUPERFLUIDITY will provide a converged cloud-based 5G concept that will enable innovative use cases in the mobile edge, empower new business models, and reduce investment and operational costs.
In September 2016, China’s Ministry of Industry and Information Technology announced that the government-led 5G Phase-1 test of key wireless technologies for future 5G networks were completed with satisfactory results. The tests were carried out in 100 cities and involved seven companies – Datang Telecom, Ericsson, Huawei, Intel, Nokia Shanghai Bell, Samsung and ZTE. The next step in 5G technology development involving trials is under way, with planned commercial deployment in 2022 or 2023. In April 2017 Huawei announced that it jointly with Telenor conducted successful 5G tests with speeds up to 70 Gbit/s in a controlled lab environment in Norway. The E-band multi-user MIMO can provide a 20 Gbit/s speed rate for a single user. Working as a supplementary low-frequency band, the E-band improves the user experience of enhanced mobile broadband (eMBB).
(from Wikipedia)

工业4g路由器上装载各种应用软件相关的问题

Category : 产品文章

与软件有关的问题

* 软件的重要性

过去,工业路由器被看作是最佳转发数据包的硬件设备,软件仅提供监视器的功能。但随着工业级路由器的发展,软件在工业无线路由器中起的作用越来越大。实际上,实时操作系统(如,通信领域常用PSOS和VxWorks)的选择对一个通信产品来说是至关重要的。如果要开发效率很高的软件,需要操作系统厂商的支持。就是自己开发专用的工业级无线路由器操作系统以及应用软件。如果这种趋势继续发展,终端用户将来可以很方便地在工业4g路由器上装载各种应用软件模块,使工业级4g路由器能够提供防火墙、流量管理策略、特殊应用信令、路由策略等功能。

* 网管系统

目前的网管协议是简单网管协议版本2.0(SNMPv2,Simple Network management Protocol v2.0),在TCP/IP协议中用UDP协议实现。由于工业LTE路由器在体系结构上的变化,使得一些网管信息需要由底层的硬件来提供,这一点和以前的实现方法是不同的。这里的工作主要是通过网管功能和管理信息数据库(MIB-Management Information Base)的实现来给网络管理者提供充足的管理信息和强大、灵活的管理功能。全网4g通路由器

* 计费

对用户的全网通工业级路由器数据流量进行计费需要提取IP包的地址、端口、CoS等信息,由于端口速率很高,这部分信息的数据量也是比较大的,如果在接口板上进行处理很不现实。而且,不同的ISP收费的标准很可能是不一样的。因此,应该将计费功能分离出去,工业级LTE路由器接口板只负责提供一个计费信息的接口,把计费信息送出来。之后,可以将这些数据写到外部存储设备,由专门的机器进行计费处理。这样将减轻工业全网路由器的负担,计费功能的实现也更加灵活。

* 配置

工业级全网路由器的配置是一项非常重要而又较困难的工作,一旦出现错误配置,不但难以发现,而且会出现一些难于琢磨的性能问题。随着工业全网通路由器技术的发展,其配置会越来越简单和有效,这个问题的完善解决将是一个长期的工作。

* 软件的稳定性

大家知道,工业级全网通路由器的硬件可以用热备份、双电源供电、数据通路备份等方法来提高稳定性,但对于全网通工业路由器软件的稳定性则是一个较难解决的问题。一个大网络系统的稳定性的前提条件是软件的稳定性。软件稳定性的难点在于软件的状态均受不同软件相互作用的影响。4g无线路由器

工业路由器组播数据包的二层交换及其技术特点

Category : 产品文章

工业路由器:组播数据包的二层交换

网桥或二层交换机(以下统称二层交换机)是工作在二层的网络设备。当它们收到工业路由器组播数据包后如何处理?最简单的处理方式就是当网桥从一个接口收到全网通工业级路由器组播数据报后向所有其它接口都转发出去。一般的没有组播功能的二层交换机都是这么处理的,所以这样的网桥也最便宜。但是这样处理就偏离的工业级路由器组播的初衷。

然而,具有组播功能的二层交换机可以做到只在需要的接口上才转发工业无线路由器组播数据。那么如何实现 ?

二层交换机将在转发表中添加一项:MAC地址是组播地址,端口包含与希望接收到工业级无线路由器组播数据的主机相连所有的端口。以后当二层交换机接收到组播数据报后,将向除接收端口外的所有转发表项的其它工业4G路由器希望接收组播数据的端口转发组播数据。

4g路由器:组播技术的特点

工业4g路由器IP组播技术有效地解决了单点发送多点接收、多点发送多点接收的问题,实现了工业3G路由器IP网络中点到多点的高效数据传送,能够有效地节约网络带宽、减轻服务器及网络的负载。因此具有增强效率,优化性能,分布式应用等优点。

由于工业级3g路由器IP组播是基于UDP的,所以全网通工业路由器IP组播也可能有信息包传送不可靠、信息包重复、信息包不按序到达、无流量控制等缺点。4g无线路由器

对于过滤工业级路由器路由有哪些特别注意的地方

Category : 产品文章

如果将不必要的工业路由器路由发入错误的协议,可能导致路由环路或次优路径,因此,可以采用过滤手段将相应路由过滤掉,对于过滤工业级路由器路由,有以下特别注意的地方:4g无线路由器

工业无线路由器路由过滤可以通过Distribute-List来实现,Distribute-List可以适用的协议和方向有:

RIP(距离矢量工业级无线路由器路由协议)

可适用于in方向和out方向。

EIGRP(距离矢量工业4G路由器路由协议)

可适用于in方向和out方向。

OSPF(链路状态路由协议)

在OSPF本协议进程内,只适用于in方向,只对自己的路由表生效,无法影响邻居的路由表;在除OSPF之外的其它协议进程下,可用于out方向,在于将OSPF重分布进其它工业全网通路由器路由协议时做过滤,此过滤称为进程过滤,不仅适用于OSPF协议重分布进其它协议时适用,同样适用于其它协议重分布进OSPF或其它协议之间重分布。

Route-Map可以单独用在工业级4G路由器路由重分布时控制和过滤路由。4g路由器

除了在必要时,将路由过滤掉之外,当需要在不同协议或不同AD值之间调整路优选择优先权时,可以通过修改工业级3G路由器路由协议默认的AD值来实现,修改AD值可以是基于整个协议的修改,将对协议内所有路由条目生效,也可以对特定全网通工业路由器路由修改;如果只是需要对特定路由修改AD值,则需要调用ACL或Prefix-Lix来匹配特定路由,除此之外,还要定义工业级全网通路由器路由去往目的地的下一跳地址,RIP和EIGRP都需要在对特定全网通工业级路由器路由调整AD值时定义路由下一跳地址,而对于OSPF,其LSA中并没有明确写明去往目的地的下一跳地址,因为这个地址需要OSPF通过LSA计算后得知,所以在OSPF下对特定工业3G路由器路由调整AD值时定义的路由下一跳地址为产生该LSA的Router-ID。

以低端路由器为例介绍工业级4g路由器标准的主要内容

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低端工业路由器标准与高端工业级路由器标准内容有一定差异,差别主要体现在工业无线路由器接口类型、性能要求、可靠性要求等方面。一般来说高端工业级无线路由器对性能要求高,接口速率要求高,可靠性要求高,它主要用作高速转发;低端路由器要求功能较多,除企业网应用外,公网中一般用它来作接入。上述两类工业4G路由器在基本功能方面差异不大。所以下文以低端路由器为例介绍工业级4g路由器标准的主要内容。

标准的第一部分指明标准应用的范围,规定了工业LTE路由器的技术要求,包括功能、指标、通信接口、通信协议、环境要求等。

第二部分罗列出工业全网通路由器标准所引用的标准与规范。如上文所述,有近百个文档。

第三部分列举在标准中使用的所有定义、术语和缩写,主要定义工业全网路由器以及低端工业级全网路由器。

第四部分指出工业级LTE路由器的功能划分以及实现方法,他们分别如下。

(1)接口功能:用作将工业级全网通路由器连接到网络。可以分为局域网接口及广域网接口两种。局域网接口主要包括以太网、令牌环、令牌总线、FDDI等网络接口。广域网主要包括E1/T1、E3/T3、DS3、通用串行口(可转换成X.21DTE/DCE、V.35DTE/DCE、RS232DTE/DCE、RS449DTE/DCE、EIA530DTE)等网络接口。(2)通信协议功能:该功能负责处理通信协议,可以包括TCP/IP、PPP、X.25、帧中继等协议。(3)数据包转发功能:该功能主要负责按照路由表内容在各端口(包括逻辑端口)间转发数据包并且改写链路层数据包头信息。(4)路由信息维护功能:该功能负责运行路由协议并维护路由表。路由协议可包括RIP、OSPF、BGP等协议。(5)管理控制功能:全网通工业级路由器管理控制功能包括五个功能,他们是SNMP代理功能、Telnet服务器功能、本地管理、远端监控和RMON功能。通过五种不同的途径对全网通工业路由器进行控制管理,并且允许纪录日志。(6)安全功能:该功能用于完成数据包过滤、地址转换、访问控制、数据加密、防火墙以及地址分配等。还有在第四部分中指出的全网工业路由器必须实现的基本功能。4g DTU