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物联网接入技术简述

作者:高考题库网
来源:https://www.bjmy2z.cn/gaokao
2021-02-09 22:47
tags:

-

2021年2月9日发(作者:recall)


out city cre


ated, and care masses life, focus w


ork, in- de


pth i


nvestigation, more out boutique masterpie


ce, makes we


of research results m


ore to into l


ed of de


cisi


on vi


sion, more to in


national some has effect of ne


wspaper Shang publi


she


d, for advance w


ork, and p


ubli


city cha


ngde


play due of role.


Third, informati


on submitted to


be pragmatic. Quick a


nd timely. The a


nci


ents sai


d: for the time system; statement ba


ck for the time bei


ng, nothi


ng. Therefore, the


submi


ssion of information to do


probl


em faster, editorial


writing, send and read faster appr


oval and feedback


to implement quickl


y. To be tr


ue and accurate.


True mai


nly reflect the full


pict


ure of events,


one i


s one, two, t


his is the life of the information. Accura


cy is primarily


qualitative a


nd quantitative questi


ons, quantitative objective


of publicQualitative logic. T


o


be relia


ble and useful. We submit informa


tion to have a


ccess to


deci


sion-maki


ng, to gui


de a


nd pr


omote the w


ork and solve practi


cal pr


oblems. Mixed cum.


On the


negative information and emergency information, rapi


d escal


ation i


n strict a


ccorda


nce wit


h the


proce


dure


s, firm, newspape


r, newspapers, never late, fail to re


port, false cl


aim and


skimming. Inve


stee 2. supervi


sion and insi


st on, around a


nd


protecti


ng their i


nterests to touch the trut


h, seek


practical re


sults. A


dhere to pe


opl


e-oriente


d, the most important thing is to reali


ze, safeguar


d and devel


op t


he fundamental intere


sts of the


overwhe


lming majority of the


people.


We carry out inspe


ction, so m


ust go de


ep among the masses, go


dee


p into t


he realities, alway


s pay attention to the


pe


ople's liv


elihood, to grasp t


he publi


c se


ntiment, and earnestly safeguar


d the benefit, addressi


ng the masses are most


concer


ned a


bout and reflecting the stronge


st issues, efforts to solve the


probl


em of deci


sions impl


emented a


nd


not impleme


nted.


One i


s to stick to


principle


s. Right of inspe


ction is one of the m


ost importa


nt pow


ers of the


Office, shoul


d not only


dare to use, but also with caution. So


-called


dared to


use, is t


o hold a number


of important issues, bold supervi


sion over supervi


sion, track inspe


ction, pr


oblem


s are not solved


do


not pa


ss, the


blame does


not hold


did not miss,


dissati


sfaction of the masse


s di


d not miss, the real rig


ht of supervisi


on a


uthorit


y, with t


he be


nefits.


Cal


l with ca


ution, is supervi


sing departments


shoul


d strengthen the consciousness of a


uthori


zed stri


ctly accordi


ng to pr


oce


dure,


preventi


ng the supervi


sion and excessiv


e to preve


nt addi


ng burde


n to grass


-root


s. To this e


nd, t


he supervision


Departme


nt of the Party Committee of supervision must be under city and County party Committee Secretary-General (Office). Se


cond, we


shoul


d focus on. Is the Gover


nor, those related t


o the globalEvent,


Governor the


protracte


d diff


icult,


strong Governor during emergency urge


nt. Not


having spe


cial de


partments i


n charge of the Ge


neral Gov


ernor, under t


he normal proce


dure


can


do good t


hings


not Governor,


not aut


horize


d by County leader


s, not t


he Gov


ernor. Thir


d is to solve


the problem. The pur


pose of supervi


sion, to resolve the pr


oblem.


o a


dher


e to and further impr


ove the


物联网接入技术



< p>
物联网


IOT



Inte rnet


of


Things


)是把 所有物品通过射频识别、红外感应器、全球定位


系统、


激光扫描 器等信息传感设备,


按照约定的协议,与互联网连接起来,


进行 信息交换和


通讯,实现智能化识别、定位、跟踪、监控和管理。



在物联网中,


物品标签中存储着规范而具有互用性的信息,


通过无线数据通信网络自动


采集到中央信息系统,

< br>实现对物品的识别,


然后通过开放性的计算机网络实现信息交换和共


享,实现对物品的管理和监控。



物联网应用可分为 传感网络,传输网络,


应用网络三层,


系统应用流程可分为:首 先对


目标物体属性进行标识,


静态属性可直接存储在标签中,< /p>


动态属性可由传感器实时探测;



次识别 设备完成对目标物体信息的读取,并将信息转换为适合网络传输的数据格式;再次,


将目 标物体的信息通过网络传输到信息处理中心,由处理中心对物体信息进行相关的操作。



物联网接入技术是构建物联网的核心主要包括以太网技术,


WL AN


技术,


Bluetooth



术,


Zigbee


技术,

< br>UWB


技术,


NFC


技术。





Ether net


技术即以太网技术,是比较成熟稳定的联网技术,配合光网技术的发展,它目


前是最为主流的网联网接入技术。是一种计算机局域网组网技术。


I EEE


制定的


IEEE


802.3< /p>


标准给出了以太网的技术标准。它规定了包括物理层的连线、电信号和介质访


问层协议的内容。以太网是当前应用最普遍的局域网技术。它很大程度上取代了其他

< br>局域网标准,如令牌环网(


token


ring




FDDI



ARCNET


。以太网的标准拓扑结构


为总 线型拓扑,但目前的快速以太网(


100BASE-T



1000BASE-T


标准)为了最大程


度的 减少冲突,最大程度的提高网络速度和使用效率,使用交换机(


Switch


hub


)来


进行网络连接和组织,这样,以太网 的拓扑结构就成了星型,但在逻辑上,以太网仍


然使用总线型拓扑和

CSMA/CD



Carrier Sense Multiple Access/Collision Detect


即带


冲突检测的载波监听多路访问)的总线争用技术。


为了使不同计算机厂家生产的计算机能够相互通信,以便在更大的范围内建立计


算机 网络,国际标准化组织(


ISO


)在


1 978


年提出了



开放系统互联参考模 型



,即著


名的


OSI/RM


模型(


Open System Interconnection/Reference Model



。它将计算机网络


体系结构的通信协议划分为七层,自下而上依次为:物理层(


Physics Layer



、数据 链


路层(


Data Link Layer


、网络层(


Network Layer



、传输层(


Transport Layer



、会话


层(


Ses sion Layer



、表示层(


P resentation Layer



、应用层(

< p>
Application Layer



。但在< /p>


实际的应用生产过程中,


使用的是


TCP /IP



Transmission Control Protocol/Internet Protocol



传 输控制协议


/


因特网互联协议)网络通讯协议。


TCP/IP


由四个层次组成:网络接口层、


网络层、 传输层、应用层。




WLAN(Wireless Local Area Network


,无线局域网


)


,是指应用无线通信技术将计


算机设备互联起来,构成可以互相通信和实现资源共享的网络体系


,


从而使网络的构


建和终端的移动更加灵活。


WLAN


通信系统一般使用在同一座建筑内。


WLAN


使用



ISM (Industria l



Scientific



Medical)



无线电广播频段通信。


WLAN




IEEE 802.11a



标准使用



5


GHz


频段


,支持的最大速度为



54


Mb/s



IEEE


802.11b





IEEE


802.11g


标准使用


2.4 GHz


频段,分别支持最大


11 Mb/s



54 Mb/s


的速度。



IEEE802. 11WLAN


提供两种运作模式:


Ad-Hoc


模式


(点对点或对等模式)



Infrastructure


模式


(即基础模式)

< p>


二者差别在于是否采用了接入点


AP

< p>


Access Point


< br>。


目前大部分


WLAN


eeli ngs surve


y, by l


ooki


ng up


public


sentiment


s to find


probl


ems. Pr


oblem


s will increase its


spe


cial supervi


sion, set up accounts, hol


d on to it. We should


conscienti


ously im


plement the leadi


ng contracting matters, secured, had an a


nsw


er to everythi


ng, the


n settles rate of 100%. Have an im


pact on some of the outsta


ndi


ng issues,


super


visi


on departments a


nd i


nformation


com


ponents toget


her,


play the supervisory r


ole of the


news medi


a to prom


ote problem solving. Investee 3. i


nsist


on a daily run, around t


he pra


ctice


of truth catching efficie


ncy, focus specification. To give full play to th


e party Office around connecti


ng, coor


dinati


ng internal a


nd exter


nal features, conta


ct, rally at all levels, to motivate every a


spe


ct, adhere to the truth, stre


ngthe


ning sta


ndar


dize


d management to a


chi


eve cohere


nt, efficient and effective functioning of the


daily w


ork of the Party Committee. Is pr


oce


ssing messages should


strive to streamline,


standardize a


nd


qualit


y.


Streamlining is to contr


ol the


number


of


messages, compress message


s, reducing


procedures, impr


ove message


handling efficie


ncy. Specificati


ons, is to stri


ctly enforce t


he ba


n issued


by the Communi


st party aut


horities i


n document ha


ndling regulati


ons and provi


ncial a


nd m


uni


cipal reg


ulations, conscie


ntiously strengt


hen a


nd impr


ove communications management to e


nsur


e that party documents


orderl


y. High


qual


ity, is to im


prove the


quality


of message pr


ocessing, it i


s ne


cessary t


o accurately impleme


nting the i


ntenti


on of the


Party Committee, cl


earance, good communi


cations,


poli


cy program cl


ose


d, ensuri


ng that there i


s no err


or. Second meeting sche


dul


ed to e


nsure thor


oug


h, safe and efficient. Any arra


ngements for the meetings a


nd eve


nts, caref


ully arranged, item


-by- item interface impleme


nted, sure. To vigorously streamli


ne meeting


s, activitie


s, num


ber of pressure re


duction, scal


e to ensur


e that leadership emerge


d from the General Confere


nce a


nd e


ntertainment service


s, focus on big thi


ngs, matters. T


hird, re


cepti


on services


should lay stress on huma


ne, personal, cultural a


nd


human. Recepti


on a


nd w


ork dire


ctly with people, reception servi


ces


directly affecting the Office of party Committee The image of the regi


on. At the same time strengtheni


ng the constr


ucti


on of li


brary, impr


ove the re


cepti


on


conditions, mor


e human- ori


ented,


personal,


cult


ural work int


o the re


cepti


on, a little more


huma


n nee


ds, a little more


huma


n care more


humane atmosphere, a


nd


constantly impr


ove the servi


ce, im


prove the


quality of service.


Meanwhile


, to further


pay spe


cial attenti


on to the daily w


ork of the ot


her Office System. Confide


ntial work responsi


bility system for leadi


ng ca


dres to impl


ement se


curity as a lea


der, to improve t


he confide


ntiality of classified personnel


, especially lea


ding


cadres, strengtheni


ng party and Gover


nment focus


on vital se


ctors


of security management, to a


dvance priva


cy management sta


ndar


dization, modernizati


on


of security techniques as a mea


ns of admi


nistration accordi


ng to law a


nd se


curity


enforceme


nt, ensure the


safety of the party and State secrets. Confide


ntial work to meet the dema


nds


of new technology


develo


pment


out city cre


ated, and care masses life, focus w


ork, in-de


pth i


nvestigation, more out boutique masterpie


ce, makes we


of research results m


ore to into l


ed of de


cisi


on vi


sion, more to in


national some has effect of ne


wspaper Shang publi


she


d, for advance w


ork, and publi


city cha


ngde


play due of role.


Third, informati


on submitted to


be pragmatic. Quick a


nd timely. The a


nci


ents sai


d: for the time system; statement ba


ck for the time bei


ng, nothi


ng. Therefore, the


submi


ssion of information to do


probl


em faster, editorial


writing, send and read fast


er appr


oval and feedback


to implement quickl


y. To be tr


ue and accurate. True mai


nly reflect the full


pict


ure of events,


one i


s one, two, t


his is the life of the information. Accura


cy is primarily


qualitative a


nd quantitative questi


ons, quantitative objective


of publicQualitative logic. T


o


be relia


ble and useful. We submit informa


tion to have a


ccess to


deci


sion-maki


ng, to gui


de a


nd pr


omote the w


ork and solve practi


cal pr


oblems. Mixed cum.


On the


negative information and emergency information, rapi


d escal


ation i


n strict a


ccorda


nce wit


h the


proce


dure


s, firm, newspape


r, newspapers, never late, fail to re


port, false cl


aim and


skimming. Inve


stee 2. supervi


sion and insi


st on, around a


nd


protecti


ng their i


nterests to touch the trut


h, seek


practical re


sults. A


dhere t


o pe


opl


e-oriente


d, the most important thing is to reali


ze, safeguar


d and devel


op t


he fundamental intere


sts of the


overwhe


lming majority of the


people.


We carry out inspe


ction, so m


ust go de


ep among the masses, go


dee


p into t


he realities, alway


s pay attention to the


pe


ople's liv


elihood, to grasp t


he publi


c se


ntiment, and earnestly safeguar


d the benefit, addressi


ng the masses are most


concer


ned a


bout and reflecting the stronge


st issues, efforts to solve the


probl


em of deci


sions impl


emented a


nd


not impleme


nted.


One i


s to stick to


principle


s. Right of inspe


ction is one of the m


ost importa


nt pow


ers of the


Office, shoul


d not only


dare


to use, but also with caution. So- called


dared to


use, is t


o hold a number


of important issues, bold supervi


sion over supervi


sion, track inspe


ction, pr


oblem


s are not solved


do


not pa


ss, the


blame does


not hold


did not miss,


dissati


sfaction of the masse


s di


d not miss, the real rig


ht of supervisi


on a


uthorit


y, with t


he be


nefits. Cal


l with ca


ution, is supervi


sing departments


shoul


d streng


then the consciousness of a


uthori


zed stri


ctly accordi


ng to pr


oce


dure,


preventi


ng the supervi


sion and excessiv


e to preve


nt addi


ng burde


n to grass-root


s. To this e


nd, t


he supervision


Departme


nt of the Party Committee of supervision must be under city and County party Comm


ittee Secretary- General (Office). Se


cond, we


shoul


d focus on. Is the Gover


nor, those related t


o the globalEvent,


Governor the


protracte


d difficult,


strong Governor during emergency urge


nt. Not


having spe


cial de


partments i


n charge of the Ge


ner


al Gov


ernor, under t


he normal proce


dure


can


do good t


hings


not Governor,


not aut


horize


d by County leader


s, not t


he Gov


ernor. Thir


d is to solve


the problem. The pur


pose of supervi


sion, to resolve the pr


oblem.


o a


dher


e to and further impr


ove the


采用


Infr astructure


模式组网,移动终端通过


AP

< p>
接入网络。在基础结构网络中,具有无线接


口卡的无线终端以无线接入点< /p>


AP


为中心,通过无线网桥


AB


、无线接入网关


AG


、无线接

< br>入控制器


AC


和无线接入服务器


AS


等将无线局域网与有线网网络连接起来,


可以组建多种


复杂的无线局域网接入网络,实现无线移动办公的接入。



Wi-Fi



Wireless


Fidelity


,无线保真)


,实质上是 一种商业认证,具有


Wi- Fi


认证


的产品符合


IEEE


802.11b


无线网络规范,它是当前应用最为广泛的


WLAN


标准,采


用波段是


2.4GHz



IEEE 802.11b


无线网络规范,最高带宽为


11 Mb/s


,在信号较弱或


有干扰的情况下,带宽可调整为

5.5Mb/s



2Mbps


和< /p>


1Mb/s


,带宽的自动调整,有效


的保 障了网络的稳定性和可靠性。




Wi-Fi


同时也是一种无线联网的技术,以前通过网线连接电 脑,而现在则是通过


无线电波来连网,常见的就是一个无线路由器,那么在这个无线路由 器的电波覆盖的


有效范围都可以采用


WIFI

< br>连接方式进行联网,如果无线路由器连接了一条


ADSL


线


路或者别的上网线路,则又被称为



热点







Wi-Fi


是目前无线接入的主流标 准,但是在


Intel


的强力支持下,


Wi-Fi


已经有了







< br>是








Wi-Fi

< br>的


WiMAX



Worldwi de


Interoperability


for


Microwave Access


,即全球微波互联接入)< /p>


,对比于


Wi-Fi


< br>802.11


标准,


WiMAX




802.16


系列标准,使用频段 范围


2-66GHZ


。与前者相比,


W iMAX


具有更远的传输


距离、更宽的频段选择以及更高的接入 速度等等,预计会在未来成为无线网络的一个


主流标准。




WAPI



Wireless LAN Authentication and Privacy Infrastructure


无线局域网鉴别和


保密基础结构)是无线局域网


(WLAN)


中的一种传输协议,是一种安全协议,中国无


线局域网安全强制性标准,它与现行的


802.11b


传输协议比较相近。其安全性要比


eelings surve


y, by l


ooki


ng up


public


sentiment


s to find


probl


ems. Pr


oblem


s will increase its


spe


cial supervi


sion, set up accounts, hol


d on to it. We should


conscienti


ously im


plement the leadi


ng contracting matters, secured, had an a


nsw


er to everythi


ng, the


n settles rate of 100%. Have an im


pact on some of the outsta


ndi


ng issues,


supervisi


on departments a


nd i


nformation


com


ponents toget


her,


play the supervisory r


ole of the


news medi


a to prom


ote problem solving. Investee 3. i


nsist


on a daily run, around t


he pra


ctice


of truth catching efficie


ncy, focus specification. To give full play to the party Office around connecti


ng, coor


dinati


ng internal a


nd exter


nal features, conta


ct, rally at all levels, to motivate every a


spe


ct, adhere to the truth, stre


ngthe


ning sta


ndar


dize


d management to a


chi


eve cohere


nt, efficient and effective functioning of the


daily w


ork of the Party Committee. Is pr


oce


ssing messages should


strive to streamline,


standardize a


nd


qualit


y.


Streamlining is to contr


ol the


number


of


messages, compress message


s, reducing


procedures, impr


ove message


handling efficie


ncy. Specificati


ons, is to stri


ctly enforce t


he ba


n issued


by the Communi


st party aut


horities i


n document ha


ndling regulati


ons and provi


ncial a


nd m


uni


cipal reg


ulations, conscie


ntiously strengt


hen a


nd impr


ove communications management to e


nsur


e that party documents


orderl


y. High


qual


ity, is to im


prove the


quality


of message pr


ocessing, it i


s ne


cessary t


o accurately impleme


nting the i


ntenti


on of the


Party Committee, cl


earance, good communi


cations,


poli


cy program cl


ose


d, ensuri


ng that there i


s no err


or. Second meeting sche


dul


ed to e


nsure thor


oug


h, safe and efficient. Any arra


ngements for the meetings a


nd eve


nts, caref


ully arranged, item


-by- item interface impleme


nted, sure. To vigorously streamli


ne meeting


s, activitie


s, num


ber of pressure re


duction, scal


e to ensure that leadership emerge


d from the General Confere


nce a


nd e


ntertainment service


s, focus on big thi


ngs, matters. T


hird, re


cepti


on services


should lay stress on huma


ne, personal, cultural a


nd


human. Recepti


on a


nd w


ork dire


ctly with people, reception servi


ces


directly affecting the Office of party Committee The image of the regi


on. At the same time strengtheni


ng the constr


ucti


on of li


brary, impr


ove the re


cepti


on


conditions, mor


e human- ori


ented,


personal,


cult


ural work int


o the re


cepti


on, a little more


huma


n nee


ds, a little more


huma


n care more


humane atmosphere, a


nd


constantly impr


ove the servi


ce, im


prove the


quality of service.


Meanwhile


, to further


pay spe


cial attenti


on to the daily w


ork of the ot


her Office System. Confide


ntial work responsi


bility system for leadi


ng ca


dres to impl


ement se


curity as a lea


der, to improve t


he confide


ntiality of classified personnel


, especially lea


ding


cadres, strengtheni


ng party and Gover


nment focus


on vital se


ctors


of security management, to a


dvance priva


cy management sta


ndar


dization, modernizati


on


of security techniques as a mea


ns of admi


nistration accordi


ng to law a


nd se


curity


enforceme


nt, ensure the


safety of the party and State secrets. Confide


ntial work to meet the dema


nds


of new technology


development

-


-


-


-


-


-


-


-



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