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Why link speed is lower than the device signal rate?

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Why link speed is lower than the device signal rate?

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
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 2021-04-30 02:12:56
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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Re:Why link speed is lower than the device signal rate?
2021-03-15 06:30:10 - last edited 2021-04-30 02:12:56

@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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#2
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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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#5
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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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#6
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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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#8
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Re:Why link speed is lower than the device signal rate?
2021-04-29 05:08:34

@Solla-topee No more solution?

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Re:Why link speed is lower than the device signal rate?
2021-04-30 02:14:48 - last edited 2021-04-30 02:15:10

@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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