According to In-Stat data, the draft version of 8.02.11n increased by 340% in 2007. By 2009, 802.11n standard products will completely put 802.11a/g devices on discount shelves, now facing the most Whether the actual problem is escalated to the new standard, and when and how to upgrade. The following sections will point out what factors should be considered to upgrade to 802.11n to maximize benefits and maximize the impact of migration.
Evaluate the needs of enterprise networks for 802.11nThe 802.11n physical layer and link layer can significantly increase the speed, capacity, coverage and stability of the enterprise wireless network. However, to realize these potential functions, it is necessary to take into account the company's business development, so record the following points in advance before purchasing an access device (AP).
Which applications will be supported by upgrading to an 802.11n wireless network? Many enterprises need to support more applications and more complex applications after upgrading the wireless network. For example, a wireless network with only the first email, the ordinary wireless network performs very well, but if it is allowed to support sound files and video stream files, this The network is obviously very bad. So, to record all the applications that need to be supported by the 802.11n network. Such as network throughput, latency and coverage.
How many users must I support to upgrade to an 802.11n wireless network? The real company is divided into several areas, each area accesses the number of terminals of the wireless network, and it is necessary to consider how many users are always online, and considering the specific application of the network, the number of devices can be calculated. For example, the company's second-tier network application is VoIP, and conference room computers primarily use Web and IM instant messaging tools.
Which terminal devices will be supported for upgrading to 802.11n? It may take another 2 or 3 years for laptops to be upgraded to the 11n standard on a large scale. Mobile phones and scanners may take longer, and the allocation of existing equipment is mainly based on protocols (a/b/g/draft n/final n) and Work bandwidth, so take into account the current and future distribution ratio.
Does upgrading to 802.11n require a backhaul link function? (In wireless technology, backhaul refers to the function of transmitting voice and data traffic from a cell site to a switch.) Many enterprises take wireless networks only to implement edge access functions, and do not apply to mainstream services. The 5GHz bandwidth of 802.11n has changed this phenomenon. So determine where the wireless network works best.
How to integrate with existing networks?Few companies upgrade directly to the 802.11n network, and abandon the previous wireless network, more to consider how to integrate? So considering the convergence factor, you need to consider the following questions.
Do you need to protect your original investment? The 802.11n standard defines a high-throughput network, but this is a pure 11n network. If it is in a mixed environment, a hybrid mode must be chosen to ensure the coexistence of earlier devices and today's networks.
Where do you not support old devices? The 802.11n hybrid mode guarantees interference between devices but reduces network throughput. Therefore, in the new network environment, only the 11n unique mode is used, and the 20 MHz and 40 MHz channels are used to operate at a bandwidth of 5 GHz. But in this way, the old equipment can not access the network in this area.
Do you need to double-wire your wireless network? Business decisions the network is the best way. If the 11.n device requires high-speed network support and the earlier device also needs access to the network, then a dual network arrangement needs to be considered. Of course, if there is already a wireless network before, then the new device at the price of 802.11n will be fine.
When is the time to say goodbye to the hybrid era? Now 11g network supports 54Mbps network speed, and then it is not supported, so the old equipment will exit early, and the wireless network performance will be realized earlier.
Determine the impact on the network architectureAs mentioned above, 802.11n can provide many applications, but it also needs more support. Therefore, before deploying a new 11n network, consider existing network equipment and which upgrades have reached the 11n network.
Is the network controller a bottleneck? Many enterprise networks have upgraded from past autonomous system APs to thin APs, but all network traffic needs to go through network controllers, and 802.11n's large amount of network traffic will cause network congestion, so in order to avoid this, APs need to be considered. - The connection method of the AP, or a distributed network control system.
When do I need a backhaul link function? In theory, the 11n AP supports a maximum of 600 Mbps. In fact, even if the fused mode supports at least 200 Mbps, and this data is gradually increasing, it is necessary to consider upgrading the current 10/100 edge Ethernet switch.
How to solve the existing 802.11n power support problem? 802.3af PoE (Power over Ethernet: A method of powering remote terminals with an Ethernet cable that carries data.) It does not support enough power. A likely solution is to use fewer MIMO antennas, either a new PoE power supply mode, or two PoE ports, or an AC direct power supply.
Start deploying a new wireless network802.11AP is not only fast, but also uses MIMO antenna technology and a wider channel. The signal is multi-input and multi-output, but MIMO technology also brings some problems. In order to avoid the cost of error and the cost of rework, it should take time to make a formal plan.
Where is the 802.11nAP located? Some manufacturers' suggestions are to remove the earlier wireless network. This is of course simple, but it is not the most effective way. The most effective way is to draw the 802.11n model, including the AP's location and coverage, and network capacity.
Does your 802.11n model really work? Models are important, but they are not a substitute for reality. Tools are needed to measure the actual signal size and coverage, as there are obstacles and disturbances in the display. But the strong signal does not mean that MIMO has a good user experience, so it is best to measure the actual application.
What bandwidth and channel will you use? 802.11n can use 20MHz and 40MHz in 2.4G HZ and 5G HZ bandwidth. 2.4MHz bandwidth is often accessed by many clients, resulting in network congestion, so the newspaper 20MHz channel is there, retaining 40MHz channel working on 5GHz bandwidth for high-traffic applications, using automatic channel selection and power adjustment Network Planning.
Do you need to prioritize network traffic? Most services require 802.11n APs to support 802.11e Wi-Fi multimedia prioritization. If your wireless network must support voice, video, and data prioritization, mark your application on the WMM access category.
Participate in management and security upgradesAfter the 802.11n installation is completed, maintenance, monitoring, security, and maintenance of the old wireless network applications require an upgrade of the management tools.
Is the wireless network administrator qualified for the job? Large enterprises can coordinate personnel to maintain wireless networks, but more hope to develop a set of management software to maintain, in order to make this 802.11n more dynamic and high capacity.
Is your wireless anti-intrusion function (WIPS) ready? The extension of the protocol and the 40 MHz channel create some dead zones for network prevention. So upgrade the WIPS function to improve network security.
Is the 802.11n network fault diagnosis function complete? WLAN analyzers, spectrum analysis and performance monitoring systems must be upgraded to better understand the workings of 802.11n.
to sum upUpgrading to 802.11n is a big network upgrade, and many companies are taking advantage of this opportunity to expand wireless applications, from previously isolated network access to mission-critical applications. Taking advantage of such opportunities to reduce business costs and improve work efficiency requires careful network planning. I hope that such an article will help your company build a more powerful and fast network.
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