Controversy in the WLAN 32 cities in the country the latest application of WLAN technology summary

导语:WLAN是一项已经发展得比较成熟的技术,在地铁行业里的应用也非常多。然而,随着LTE新技术的出现,人们必然会将LTE与WLAN进行比较。
Introduction: WLAN is a mature technology that has been developed and used in metro industry is also very much. However, with the emergence of new LTE technology, people will be LTE and WLAN will be compared.
理论上,WLAN所采用的协议或机制导致WLAN网络天然地在安全性、抗干扰能力、高密度接入点的网络稳定性等方面存在问题,因此其商业性受到一定局限。
In theory, the mechanism of the WLAN agreement or cause problems in safety, anti-interference ability, high density access point network stability and WLAN network, naturally, so the business is limited.
WLAN早期采用IEEE802.11a、IEEE802.11b、IEEE802.11g等标准,现在演化到IEEE802.11ac(5.8G频率)。从理论上讲,带宽会越来越高,稳定性会越来越好。对于更新的WLAN网络,业主一般会关注它采用的协议,以及确实带来的升级体验。尤其是因为LTE需要申请频点,申请不到LTE频点的城市地铁业主就会非常期待WLAN的更好解决方案或新的探索。
WLAN early use of IEEE802.11a, IEEE802.11b, IEEE802.11g and other standards, now evolved to IEEE802.11ac (5.8G frequency). In theory, the bandwidth will be higher and higher, the stability will be better and better. For the updated WLAN network, the owners are generally concerned about the protocol it uses, as well as the upgrade experience. Especially because the LTE need to apply frequency points, the application of less than LTE frequency of urban subway owners will be looking forward to a better solution or a new exploration WLAN.
乘客WIFI网络发展比较快,应用多元化,很多城市已经开通。但对其赢利模式的探索还处于起步阶段。
Passenger WIFI network development is relatively fast, diversified applications, many cities have been opened. However, the exploration of its profit model is still in its infancy.
对于LTE与WLAN的关系。业主们普遍分成两大阵营。
For the relationship between LTE and WLAN. Owners are generally divided into two camps.
一部分业主认为,LTE会逐渐取代WLAN网络;
Some owners believe that LTE will gradually replace the WLAN network;
但另一部分业主认为,这两种网络各具优势:LTE在安全性、功率控制、对终端的广泛适用性等方面具有无可比拟的优势。但WLAN具有成本低廉、技术开放、结构简单、安装调试维修方便、带宽大(LTE理论上可以做到150M带宽,某城市地铁业主试验发现,在载客80公里时速下,LTE只有将近50M带宽;而WLAN理论上可以做到1G带宽,当然这也跟布点密度有关)等方面独具优势。

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But another part of the owners believe that these two networks have their own advantages: LTE in security, power control, the terminal has a wide range of applicability and other advantages. But WLAN has the advantages of low cost, open technology, simple structure, convenient installation and adjustment, high bandwidth (LTE theory can be found, 150M bandwidth, a city subway passenger owners test in 80 kilometers per hour, LTE only nearly 50M bandwidth; the theory of WLAN can achieve 1G bandwidth, which is related with density distribution unique advantages).
当然,不管是WLAN还是LTE,业主最关心的还是实际应用的效果,包括服务、稳定性等要能满足运营的需求。有一点需要提醒,不同厂家的交换机对于数据屏蔽和数据包处理方法有差异,因此在前期进行交换机选型时,相关人员要格外留意到这点。
Of course, whether it is WLAN or LTE, the owners are most concerned about the effect of the actual application, including services, stability, etc. to meet the operational needs. One thing needs to be reminded, different manufacturers of the data exchange for the shield and packet processing methods are different, so in the early selection of switches, the relevant personnel should pay special attention to this point.
总的来讲,比较之下,WLAN目前属于可用状态,但谈不上特别理想。业主期待厂家或设计院给出更理想的解决方案。当然,在没有更好、更成熟的技术和解决方案前,WLAN仍然是目前城市轨道交通中车地网络首选的技术,性价比、技术成熟度、市场竞争及后续的服务也是考虑范畴。运营企业更关心技术的成熟度、设备的可靠性、网络的稳定性和安全性,希望能够看到WLAN在这些方面的技术进步。
In general, by comparison, WLAN is currently available, but not particularly desirable. Owners expect manufacturers or design institute to give a better solution. Of course, in the absence of a better, more mature technology and solutions, WLAN is still the city rail transit network in the preferred technique, price, technology maturity, market competition and follow-up service is also considering the scope of. Operators are more concerned about the maturity of technology, equipment reliability, stability and security of the network, hoping to see WLAN in these areas of technological progress.

交通银行侯维栋辞去首席信息官 将继续担任副行长

我们统计了北京、上海、广州、南京、天津、长沙、郑州、无锡、武汉、苏州、西安、沈阳、长春、宁波、石家庄、徐州、济南、常州、佛山、重庆、大连、太原、合肥、深圳、南昌、昆明、呼和浩特、杭州、东莞、成都、青岛、兰州32个城市地铁的WLAN技术最新应用状况如下(若有错误或疏漏,敬请指正!)
We have statistics in Beijing, Shanghai, Guangzhou, Nanjing, Tianjin, Zhengzhou, Wuxi, Changsha, Wuhan, Suzhou, Xi’an, Shenyang, Ningbo, Shijiazhuang, Changchun, Xuzhou, Ji’nan, Changzhou, Foshan, Chongqing, Dalian, Taiyuan, Hefei, Shenzhen, Nanchang, Kunming, Hohhot, Hangzhou, Dongguan, Chengdu, Qingdao, Lanzhou 32 city subway WLAN the latest application technology are as follows (if there are errors or omissions, please correct me!)
>>>>北京
WLAN承载信号系统(2.4Gh)和PIS系统(大部分用5.8Gh)。从其运营体验来看,信号系统本身数据量较小,暂时没有干扰;但PIS车地无线通信存在一些问题,而且对于其产生原因尚无定论。
WLAN bearer signal system (2.4Gh) and PIS system (mostly with 5.8Gh). From the point of view of its operating experience, the signal system itself is a small amount of data, there is no interference; but the PIS vehicle wireless communication has some problems, but also for its cause is inconclusive.
>>>>上海
WLAN承载信号系统(2.4Gh)。建有乘客公共WIFI网。
WLAN bearer signal system (2.4Gh). Passenger public WIFI network.
有时有跳频的问题,正考虑将频率间隔拉宽,否则可能会产生干扰。之前主要采用2.4Gh频率,现在有的用5.8Gh频率。正期待新手段以避免干扰,或采用LTE等其他技术手段。
Sometimes the problem of frequency hopping is considering widening the frequency interval, otherwise it may cause interference. Before the main use of 2.4Gh frequency, and now some use 5.8Gh frequency. Are looking forward to new ways to avoid interference, or using LTE and other technical means.
>>>>广州
广州地铁使用WLAN承载信号系统、PIS系统,均采用2.4Gh频段(广州地铁采用1、6、11信道),其中2个信道给信号使用,1个信道给PIS使用。他们并行无干扰。屏蔽门也用了2.4Gh的无线扩频技术进行改造。2016年12月28日,广州全部10条地铁线路统一实现免费wifi覆盖,采用2.4Gh或5.8Gh频率,采用IEEE802.11ac标准。
Guangzhou subway using WLAN bearing signal system, PIS system, are using 2.4Gh band (Guangzhou Metro uses 1, 6, 11 channels), where the use of the signal to the use of the channel, the 1 channel to the use of PIS. They have no interference in parallel. Shielding door also uses 2.4Gh wireless spread spectrum technology to transform. December 28, 2016, all 10 subway lines in Guangzhou unified free WiFi coverage, using 2.4Gh or 5.8Gh frequency, using IEEE802.11ac standard.
未来可能会采用LTE承载信号,民用WIFI承载PIS系统。
The future may use LTE bearer signal, civilian WIFI bearing PIS system.
>>>>深圳
信号系统都用2.4Gh的WLAN承载;WLAN还承载PIS、CCTV,有的线路用2.4Gh频率,有的线路用5.8G频率。乘客公共WIFI由第三方公司开发。
The signal system is carried by 2.4Gh WLAN; WLAN also carries PIS, CCTV, and some lines with 2.4Gh frequency, and some lines with 5.8G frequency. Passenger public WIFI developed by third parties.
有两条线采用了5Gh的WLAN,效果比较不错,干扰少。
There are two lines using the 5Gh WLAN, the effect is relatively good, less interference.
有一条时速达到120公里/小时的线路采用了1.8Gh频率的LTE,2016年6月刚开通,效果也不错。
There is a speed of 120 km \/ h line using the 1.8Gh frequency of LTE, in June 2016 just opened, the effect is good.
>>>>天津
WLAN承载PIS系统,未开通乘客公共WIFI。
WLAN carrying PIS system, did not open the passenger public WIFI.

小流域综合治理政策建议

>>>>重庆
WLAN承载PIS系统、CCTV系统,都采5.8Gh频率。已开通乘客公共WIFI。
WLAN bearing PIS system, CCTV system, all 5.8Gh frequency. Public WIFI has been opened.
用到IEEE802.11ac标准,效果不错。
Use IEEE802.11ac standard, good results.
>>>>长沙
WLAN(2.4Gh)承载的业务比较多。采用IEEE802.11g标准。
WLAN (2.4Gh) carrying more business. Using IEEE802.11g standard.
在安全性方面,他们采取了很多措施:首先,设置了一些交换机防火墙,并且定期升级。其次,核心数据都必须以白名单的形式。合法数据才能进入。其他一概都是非法数据。最后,采用类似封闭式管理手段,对密码运用分级制度进行管理,防止病毒侵害。
In terms of security, they have taken a lot of measures: first, set up a number of switches firewall, and regularly upgrade. Secondly, the core data must be in the form of white list. Legal data to enter. Others are illegal data. Finally, the use of similar closed-end management tools, the use of password classification system management, to prevent the virus.
>>>>郑州
WLAN只承载了信号系统。郑州地铁2号线是国内首条采用LTE技术承载PIS和CCTV系统的地铁。在建的一条线路计划用LTE综合承载信号系统、传输车载故障信息。
WLAN only carries the signal system. Zhengzhou Metro Line 2 is the first domestic PIS system using LTE technology and CCTV bearing subway. In the construction of a line plan to use LTE integrated load signal system, transmission vehicle fault information.
>>>>南京
WLAN承载信号、PIS。未设乘客公共WIFI。
WLAN bearing signal, PIS. No passenger public WIFI.
目前采用的都是2.4Gh,后期新建线路有计划采用5.8Gh的。
At present, the use of 2.4Gh, the latter new lines have plans to use 5.8Gh.
>>>>无锡
WLAN承载信号系统、PIS系统。未设乘客用WIFI,主要是为了避免干扰。
WLAN bearer signal system, PIS system. No passengers with WIFI, mainly to avoid interference.
后期线路考虑用LTE,就有可能开通乘客公共WIFI。不过这个方案还在研讨中,还没有落实。
Consider the latter line with LTE, it is possible to open the passenger public WIFI. However, this program is still under discussion, has not yet implemented.
>>>>苏州
WLAN用来承载信号系统和PIS系统。但WLAN承载PIS系统方面,还是存在一些问题。还没开通乘客公共WIFI。
WLAN is used to carry signal system and PIS system. But WLAN bearing PIS system, there are still some problems. Passengers did not open public WIFI.
目前也在做LTE的相关工作(申请频段)。
LTE is also doing the work of the relevant (application frequency).
>>>>武汉
应武汉市里建设智慧城市的政策要求,作为接入政府大型大系统的一部分,设有WIFI的布点,以方便乘客上网。但地铁系统里暂时没有对WLAN进行规划。
Wuhan city in the construction of smart city policy requirements, as part of a large system of access to government, distribution with WIFI, for the convenience of passengers on the internet. But the subway system is not planning for WLAN.
2016年12月28日开通的6号线采用的是LTE,开通至今表现稳定。后续线路也打算采用LTE。
Opened in December 28, 2016, line 6 is the use of LTE, opened so far stable. Follow up line also intends to use LTE.
>>>>杭州
之前都用WLAN承载信号系统、PIS系统、CCTV系统,也用来传输车辆故障信息;新的在建线路打算用LTE来承载信号系统。
Before using the WLAN carrying signal system, PIS system, CCTV system, also used to transfer the vehicle fault information; the new in the construction of the line is intended to use LTE to carry the signal system.
>>>>西安目前已开通3条线,信号的无线传输和PIS系统都由WLAN来承载。 预计2018年开通的4号线打算用LTE综合承载PIS、CCTV、CBTC。乘客公共WIFI还没建设。
>>>>沈阳
WLAN承载信号系统。没开通乘客公共的WIFI。
WLAN bearing signal system. Did not open the passenger public WIFI.
安全管理人员手中的资源太有限,紧张的经费不足以开展大规模的安全意识教育活动,而且还需要恰当平衡安全培训的投入与产出,平衡员工日常工作与安全培训的时间安排。
>>>>长春

针对云计算的攻击主要面对服务器端和用户端,云平台和应用的厂家可以在服务器端做许多安全控制措施,用户端则需相应的终端安全方案,配以足够的安全培训。

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