Tx Rate Và Rx Rate Là Gì

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I have sầu a Lenovo W5trăng tròn with a 1x1 11b/g/n Wireless LAN PCI Express Half Mini Card Adapter and a D-Link DIR-825 using DD-WRT (build 18777). I understand that my adapter doesn"t work on the 5GHz frequency bvà so it can"t see the SSID that utilizes it. I am able to lớn connect khổng lồ the 2.4GHz Wi-Fi network, but I am only connecting at a rate of 54mbps, even when the signal strength is over 80% (according to lớn DD-WRT). It is my understanding that with N & 2.4GHz I could get a hypothetical Tx rate of ~120mbps, so why am I only getting 54? What can I vì chưng khổng lồ increase that rate? I am using Windows 7 Ultimate plugged in with maximum performance.

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When using 2.4GHz you have to lớn pay attention to lớn the bandwidth per channel too—to really get high speeds, you need khổng lồ be able khổng lồ implement the 40MHz per channel option, và with the 2.4GHz b& you are going to need to be able khổng lồ utilise about 82% of the whole bvà lớn achieve that.

Given how noisy 2.4GHz is in most places, that is not going to be feasible in most places, & if you set the bandwidth channel khổng lồ be "auto" my guess is that it will over up at 20MHz instead.

I have gotten the best results using a dual-radio access point and dedicating the 5GHz radio to lớn 802.11n, leaving the mixed mode or 802.11g only khổng lồ the 2.4GHz radio for compatibility.


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I followed the tips in this article và ended up setting the 2.4GHz Wi-Fi with the following settings:

Wireless Network Mode: N-Only. I don"t have sầu non-802.11n adapters. Channel Width: Turbo (40MHz)Wireless Channel: AutoExtension Channel: AutoAlso mix the Security Mode khổng lồ WPA2 Personal và AES.

That gave me a liên kết speed of 150 Mbps.

Xem thêm: Tấn Công Từ Chối Dịch Vụ Dos Và Ddos Là Gì


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A 1x1 802.11n thẻ (non-MIMO, thus sorta "N in name only" since MIMO was kind of the raison d"être on 802.11n) can only do 72.2 mbps signaling on a 20MHz channel, or 150 mbps signaling on a 40MHz channel. On 1x1 cards that can"t vì short guard intervals (short GI), those numbers drop lớn 65 và 135mbps, respectively.

The fact that you have svào signal but not at least the 65mbps data rate suggests that your client is limiting itself to lớn G mode operation for some reason. The most comtháng reasons are:

The AP.. is not mix lớn bởi N on its 2.4GHz radio.Your APhường or your client is configured to use WEPhường or TKIPhường (WPA1) encryption, not AES-CCMP (WPA2). WEPhường. & TKIPhường, as implemented by most Wi-Fi gear, is not fast enough khổng lồ keep up with N rates, so the 802.11n spec disallows using those modes with 802.11n connections. To get N rates, you have sầu lớn use AES-CCMPhường or no encryption.Your APhường (or I suppose your client) does not have sầu QoS (802.11e, WMM) enabled. The 802.11n spec requires QoS.

Then, if you really want lớn give your client a chance at max performance, you could enable 40MHz-wide channel mode on the 2.4GHz radio of your AP. It uses the lion"s cốt truyện of the 2.4GHz b& và thus is quite likely to interfere with other things (and be interfered with by other things), but if you want a chance to get 150mbps instead of just 72.2mbps, you"ll need khổng lồ enable 40MHz channel mode. Try to lớn at least lock your APhường khổng lồ one over of the bvà though, by picking either channel 1 or channel 13 (11 in North America).

By the way, signal strength of "80%" is meaningless, because there"s no standard for what that"s 80% of, và so those percentages vary from vendor to vendor, sản phẩm to lớn sản phẩm, release lớn release. See a Received Signal Strength Indication (RSSI) listed in negative sầu dBm (deciBels referenced to 1 milliWatt) is a much more useful things, because that"s pretty standard (although calibration differences make even make RSSI dBm"s a bit variable). But for the sake of this Answer I"ve chosen to believe sầu that that "80%" actually means you should be getting your top data rates.

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