路由器40mhz与20mhz区别是什么？_百度知道
路由器40mhz与20mhz区别是什么？
20MHz对应的是65M带宽
穿透性好 传输距离远（100米左右）40MHz对应的是150M带宽
穿透性差 传输距离近 （50米左右）
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20MHz和20MHZ/40MHz指的是信道带宽；无线路由器使用默认设置即可，一般无需更改。802.11n支持20MHz和20MHZ/40MHz通道。以前的标准中使用的是20MHZ的带宽，在802.11n中采用20/40MHZ的带宽，40MHz信道提供的可用信道带宽是两条802.11遗留信道的两倍多 ，802.11n标准支持20MHz和40MHz信道，其中40MHz信道将是最宽的信道，由两个邻近、遗留的20MHz频谱信道组成; 当然也可以只用20MHz信道，这个是由具体的情况决定的。
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出门在外也不愁Cisco AP信道带宽问题_百度知道
Cisco AP信道带宽问题
公司的无线要提速，购买了1142N，5Ghz的收不到，只能使用2.4Ghz。将channel width设置为20MHZ时，带宽为72M；设置为40MHZ时为150M。刚配置好时速度还是可以的，平均传输速度7M。但每逢早晨ping包延时很高，传输速度只有100KB，我将channel width改为20MHZ，速度就正常了。再过一段时间改到40MHZ也没问题了。附近有两个AP，信道分别为6,11。求高手指点怎么解决！
提问者采纳
信道尽量和别人不一样的，减少干扰，你用1频道吧2 如果有加密请用WPA2-PSK AES加密3 20MHZ的一般抗干扰能力强些，如绕过障碍物等，40MHZ的确实快点，但是并不是很稳定。你多尝试哈4 5GHZ的其实很不错，可惜有些网卡不支持吧
有时会突然变的延迟高，速度慢了。忘记说了，这是工厂里的办公楼，所有AP都可管理。使用软件查看，40MHZ下使用的信道为1和5。主信道改为3时，为3和7。
还可以变信道啊
我认为这个情况是路由器本身的质量问题 和设置的关系不大
就是说设计的产品在高负载下容易出问题建议咨询你的设备供应商有没有什么办法，设置就那几个，没多少倒腾的地方了，我就遇到过，一个路由经常信号时有时无 我重启了 马上正常，用半个月又这样。
提问者评价
虽然没有解决问题，还是很感谢！
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出门在外也不愁mixed field，1.基本设置：,网络模式,信道,操作模式（Mixed,Mode,和Green,Field,）,信道带宽（20和20/40）,Guard,Interv
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关键字： mixed field
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网友1的回答
只要一切默认就是最佳的信号模式一个屋子应该没有阻挡吧？如果信号还是不行就是路由器本身问题了！网友2的回答
手机协议不支持11bgn mixed，或者说兼容性没达到。网友3的回答
无线路游就是这样的，网友4的回答
基本设置网络模式; 11b/g/n混合模式 SSID:广播(SSID) : 开启 关闭 BSSID: C8:3A:35:5F:36:20 信道: 2472MHz (Channel 13) 操作模式: Mixed Mode Green网友5的回答
用P2P终结者限制下他网速就好了。网友6的回答
网友7的回答
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回答问题赢iPhone 6WLAN&for&20/40&MHz&Coexistence
Introduction
Recently, WLAN (Wireless Local Area Network) has become popular in
offices, homes, and even public areas. IEEE 802.11-1999 Standard
[2] is widely known as astandard of WLAN and it has a number of
amendments and supplements such as 802.11a [1], 802.11g [3],
802.11e [4], and 802.11i and also those under work in the current
activities by the task groups (TGs). The one now attracting a great
deal of attention is TGn [5, 6], which is aimed at achieving high
throughput of at least 100 Mbps. IEEE 802.11a, 802.11b, and 802.11g
are enhancements in PHY
(Physical) layer and they only extend the data rate. What is
different about them is that TGn is working not only to extend the
data rate but to increase the practical throughput at MAC (Media
Access Control) layer. To achieve high throughput, MIMO
(Multiple-Input Multiple Output) technique is the main discussion
point in PHY layer. But another important point is the channel
bundling method which extends the channel bandwidth from 20 MHz to
40 MHz [7]. By doubling the channel bandwidth of 20 MHz, the data
rate can be increased [8]. But when this channel bundling method is
introduced, the question of how to cope with the legacy 20-MHz
stations (STAs) like IEEE 802.11a will arise. 20-MHz frames are
transmitted in a 20-MHz channel as normally occurs, while 40-MHz
frames are transmitted occupying two adjacent 20-MHz channels by
the channel bundling method. When 40-MHz STAs coexist with 20-MHz
STAs in the same channels, there will be few opportunities to have
two 20-MHz channels vacant at the same time. Moreover, to acquire
both channels for 40 MHzcommunication, contention probability will
double [9&11]. On the other hand, 20-MHz STAs cannot understand
those data sent in 40-MHz, and their NAV (Network Allocation
Vector) will not be set by 40-MHz transmission. Therefore,
20-MHz STAs can interfere with 40-MHz communication. In this paper,
to solve these problems, we propose a MAC protocol to realize
coexistence between 20-MHz and 40-MHz STAs. In the proposed
protocol, an AP controls the 20-MHz and 40-MHz STAs by setting NAV,
which is a
MAC-level protection mechanism, to them, and divides time into
20-MHz and 40-MHz periods. We uate the throughput performance
by computer simulations. As a result, we show that the proposed
protocol is effective to coexistence of 20-MHz and 40-MHz STAs
where IEEE 802.11n uses channel bundling method. Our proposed
protocol is adopted in TGnSync Proposal Technical Specification [5]
and IEEE 802.11n D1.0, in 2004 and 2006, respectively
2. Proposed
&&& In this
section, we explain the proposed protocol which realizes
coexistence between 20-MHz and 40-MHz STAs. In the proposed
protocol, an AP controls the transmission of 20-MHz and 40-MHz STAs
by setting NAV to them, and divides time into 20-MHz and 40-MHz
periods. First, the AP selects two adjacent 20-MHz channels, named
control channel and extension channel, respectively, for its own
BSS. Both 20-MHz and 40-MHz STAs may associate with the BSS. All
broadcast control frames such as beacon are sent on the control
&&& Figure
explains the proposed protocol. To start a 40-MHz period, the AP
first reserves the control channel by setting NAV of legacy 20-MHz
STAs with a legacy Beacon frame or an ICB (Increase Channel
Bandwidth) frame. Figure 8 shows the frame structure of the ICB
frame. The
transmission rate of the ICB frame shall be selected from the
legacy rate set of the BSS in order to have NAV of legacy 20-MHz
STAs set. The CFP (Contention Free Period) indicated
by the Beacon or the Duration field of the ICB frame will cover the
40-MHz period plus the transition periods between 20- and 40-MHz
operation. Then, the AP shifts to the extension channel to reserve
it. The extension channel is reserved by the transmission of a
CTS-to-self or a legacy Beacon frame after an appropriate channel
access is performed on the extension channel. After the completion
of setting NAV on the extension channel, the AP resets the
NAV of 40-MHz STAs by sending a CF-end frame in 40 MHz. Thereby the
40-MHz period starts, and 40-MHz frames are exchanged among 40-MHz
STAs. To end the 40-MHz period, the AP first sets the NAV of 40-MHz
STAs by transmitting a DCB (Decrease Channel Bandwidth) frame in 40
MHz. As shown in Fig. 8, the frame structure of the DCB frame is
the same as that of the ICB frame. The 40-MHz STAs will switch back
to the control channel in 20 MHz by the DCB frame. Then the AP
resets the NAV of 20- MHz STAs first in the extension channel and
next in the control channel by transmitting a CF-End frame in 20
MHz. At this point the AP and all the STAs associated with the AP
are operating on the control channel using 20-MHz channel width.
The 20-MHz period is continued until the next transmission of a
Beacon or an ICB frame, and the
above process is repeated. One cycle of the process is illustrated
in Fig. 7. The ratio between the 40-MHz and 20-MHz periods can be
adjusted according to types of traffic, priority, and the number of
20-MHz and 40-MHz STAs.
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