Why link speed is lower than the device signal rate?

Why link speed is lower than the device signal rate?
Why link speed is lower than the device signal rate?
2021-03-05 19:52:05 - last edited a week ago
Model: TL-WN781ND
Hardware Version: V3
Firmware Version:

Hello,

How can I increass my link speed in windows 10?

 

My adapter TL-WN781ND specifications: Signal Rate Up to 150Mbps

My router TD-W9970 specifications: Signal Rate 300 Mbps

but my link speed is lower than both of them (see the image below)

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9 Replies
Re:Why link speed is lower than the device signal rate?
2021-03-15 06:30:10 - last edited a week ago

@farzad_ict  Hi, 

 

Sorry for the late update

 

1> login to Modem and go to Wireless settings> Channel width> choose 40Mhz, rather than 20Mhz for 2.4Ghz. 

2>Windows >Device Manager > Network Adapters > [tp-link Wireless Adapter] > Properties > Advanced tab. Choose Channel Width for 2.4Ghz, and set it to Auto or 40Mhz.

Update : 3> Network adapter properties, 802.11 N Mode> Enabled 

 

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Re:Why link speed is lower than the device signal rate?
2021-03-19 10:46:02

@Solla-topee 

Thank you for replying, I have 2 PCs with same hardware, and 1 router. The solution worked for second PC and speed reached 150/150 Mbps.

Also on first PC the transmit speed reached 150 but receive speed is still 54 Mbps. What can I do for increasing receive speed?

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Re:Why link speed is lower than the device signal rate?
2021-03-19 13:18:00 - last edited 2021-03-19 13:18:20

@farzad_ict 

 

 

Hello, 

 

Normally real Wi-Fi speed test result is about 30%-50% of the Link speed, as 2.4Ghz has much interference. 

Do you mean 2nd PC speed test is 15Mbps download , but on first PC speed is 54Mbps? Are they located in the same place? 

Did first PC use tp-link wireless adapter? You could try to update the driver for first PC or try a different wireless adapter and see if speed could be higher. 

 

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Re:Why link speed is lower than the device signal rate?
2021-03-19 13:53:39

@Solla-topee 

No, as you see in the screenshot that I sent in the previous post (WiFi properties window), the Link Speed has 2 parameters, Receive/Transmit.

Before changing the Channel Width, the first PC showed 54/72 and the second PC showed 72/72.

After changing the Channel Width, the first pc showed 54/150 and the second pc showed 150/150. 

I'm asking why the first pc link speed is 54/150 not 150/150? Why Receive parameter didn't increase to 150 also, like the second pc? Should I change another settings in Windows?

 

First PC Adapter: TP-Link TL-WN781ND

Second PC Adapter: Realtek 8821AE

Router: TP-Link TD-W9970

all in one room

 

 

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Re:Why link speed is lower than the device signal rate?
2021-03-19 13:55:17
I'm using the latest driver version: TL-WN781ND_EU_V3_180118
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Re:Why link speed is lower than the device signal rate?
2021-03-23 02:33:35

@farzad_ict Hi, 

 

Thank you for your reply!  on first PC, please enable 802.11n Mode .

If still not up to 150Mbps on Wireless Link speed, please disable 801.11a/b/g Mode.  

 

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Re:Why link speed is lower than the device signal rate?
2021-03-23 10:50:30

@Solla-topee 

I'm already connected on 802.11n (as you see in the screenshot)

wireless mode is Auto

802.11d is Disable

bandwidth is 20_40MHz (there is no only_40MHz option)

 

Why link speed receive is lower than transmit? Other PC (with Realtek adapter) is connected on 150/150 now, so the problem is not from the router, maybe it is from tp-link wireless adapter driver, maybe you need to release a new update for it.

 

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Re:Why link speed is lower than the device signal rate?
a week ago

@Solla-topee No more solution?

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Re:Why link speed is lower than the device signal rate?
a week ago - last edited a week ago

@farzad_ict Good day,

 

Apologize for my late update...

Here is a public driver for TL-WN781ND V3, please give it a try and see it helps  ~

https://static.tp-link.com/2019/201911/20191129/TL-WN781ND_V3.0 RTL driver 2023.56.0502.2017.zip

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