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Topic # 138298 29-Dec-2013 11:17
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My new Asus Transformer tablet cannot connect at >65Mbps ... now after tweaking its properties it only wants to connect at 24Mbps!

All my other laptops can connect at 135-144Mbps to the telecom's Thomson VDSL2 router ...

How do I make sure it is running at N mode?

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  Reply # 958565 29-Dec-2013 11:27
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have you installed all updates?




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  Reply # 958570 29-Dec-2013 11:31
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Actually looking at the specs page I can't see any mention of which 802.11 flavour it's supported.




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  Reply # 958589 29-Dec-2013 12:59
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which model?

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  Reply # 958593 29-Dec-2013 13:07
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65Mbps is 802.11n

Presumably the device is only single chain so 65Mbps is the most you'll get running at 20Mhz.


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  Reply # 958594 29-Dec-2013 13:08
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T100?

this has dual-band (2.4/5GHz) 802.11n from Broadcom’s BCM4357

see if there are newer drivers available?

Device Manager, Network adapters, then advanced properties on the right one should expose some more WiFi settings



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  Reply # 959003 30-Dec-2013 11:55
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  Reply # 959006 30-Dec-2013 11:58
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it sure says N at the top but nowhere else in the properties ...

i'm using the latest Asus driver (there is only one version)
even tried MS's own driver

under bandwidth capability however there is no N only
11a/b/g 20/40
11a/b/g 20
11a 20/40 11b/g 20
!!!

so maybe it's not N despite being advertised as N?



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  Reply # 959008 30-Dec-2013 12:00
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advertised as N here



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  Reply # 959010 30-Dec-2013 12:01
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sbiddle: 65Mbps is 802.11n

Presumably the device is only single chain so 65Mbps is the most you'll get running at 20Mhz.



my other laptops connect at 135-144Mbps - what does that mean about this device?
(router is telecom's VDSL thomson router)

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  Reply # 959014 30-Dec-2013 12:19
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I'm sure the Telecom TG589vn has its own hardware limitations to what it can do with its 2.4GHz 2x2 802.11bgn.
If you want to know what your device is capable of, you will need to turn off the other laptops and all other devices.

It may be what your other devices have negotiated cannot operate simultaneously to what your T100 wants to negotiate therefore it drops back to 1x1 20MHz 802.11n.

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  Reply # 959030 30-Dec-2013 13:02
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Hi as mentioned in the other thread, the radio in this device is clearly only a single chain one that is clearly running in "n" mode. Its quite common for tablets and smartphones to have only a single chain, most lower price range laptops are the same, only a single chain, hence they only can achieve 65MB/s on a 20MHz channel (72 if short guard band is invoked on the AP).

If you want to use 40MHz channels then you will need to allow this in the AP, your other laptops should then be able to achieve 300Mb/s (or there abouts) but I dont recommend you use 40MHz in the 2.4GHz band, but happily do in the 5GHz band if your AP is a dual band one. It appears this tablet is dual band so will get extra bandwidth if its enabled on your AP and the AP set to 40MHz in th 5GHz band.

Cyril

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  Reply # 959035 30-Dec-2013 13:07
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joker97: ...

under bandwidth capability however there is no N only
11a/b/g 20/40
11a/b/g 20
11a 20/40 11b/g 20
!!!

so maybe it's not N despite being advertised as N?


All of the N adapters I've seen provide the same option, e.g. here's a Dell example.
11a/b/g: 20 MHz
11a/b/g: 20/40 MHz
11a: 20/40 MHz
11b/g: 20 MHz (default)

The 'bandwidth capability" specifies how your device operates with the earlier standards which allowed 20MHz (single-channel) and 40MHz (two neighbouring channels) bandwidths.

Personally, I go for dual-band N devices so I can avoid the crowded 2.4GHz band. Plus if one of your neighbours is using a 40MHz bandwidth then that can severely impact your throughput.

[Edit: I see that cyril7 said it better]

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  Reply # 959038 30-Dec-2013 13:12
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Have a read of this to get an idea:

https://en.wikipedia.org/wiki/802.11n#Data_rates

In very basic terms, 802.11n is designed to improve throughput over "g". To get much faster, it can do three primary things:

1) Use a wide (40MHz vs 20MHz) radio channel - this means it uses more of the available frequency band and can transmit more data at the same time.

2) Use multiple radio chains - i.e. more than one radio and antenna at each end (MIMO). This also increases data rate because each radio can transmit data at the same time.

3) Use the 5GHz rather than 2.4GHz radio band. This is generally less congested, so less interference.

A device can be 802.11n compliant even if it doesn't support all the features - some devices will only support some features, and both the client and AP need to support a feature for it to work. Additionally, it is common for devices to support wide radio channels (40MHz), but only in 5GHz, so as not to interfere with other nearby users.

From looking at what you have posted, it looks like your device can use wide channels, 5GHz, but not MIMO. This would commonly limit to 65Mb/s on 2.4GHz. Can your AP run on 5GHz instead?

EDIT: as cyril7 pointed out, some devices can use a short guard interval which will boost throughput slightly again.



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  Reply # 959041 30-Dec-2013 13:20
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thank you so much!

no my router cannot do 5GHz. i am looking at a dual AC router when they become available and affordable ... at the moment i'm ok. the limiting factor on my tablet is the CPU not the wifi or the piddly solid state storage

but it's good fun for travelling around with 3 kids under 6!

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