Only getting 45/mbps for 802.11n wireless connection paying for 250mbps

[cloudie503]

can someone explain to me why im only getting 45mbps speed at most for my wireless connection? Im using a sb1683 arris modem and RT-AC68R router. I tired wired straight to the router next to modem and only got 95mbps. I was able to get 289mbps with my phone on 5ghz channel yesterday.

here are my specs

 

[kanewolf]

The images you linked has nothing to do with WIFI. That is cable modem data.

Single stream 2.4Ghz N WIFI (which you should be able to support with any device) will give you a link rate of 150Mbit and 75Mbit throughput.

What WIFI receiver (device) are you using?

 

[BFG-9000]

150Mbit is only possible on single-antenna 2.4GHz if no other networks are detected, such as on a farm, so that 40GHz width can be used, and if the guard interval is set for N-only.

At 20MHz wide, the link rate will be up to 65-72 depending on guard interval, so 45Mbit data rate sounds about right for a single-antenna device.

 

[cloudie503]

The images you linked has nothing to do with WIFI. That is cable modem data.

Single stream 2.4Ghz N WIFI (which you should be able to support with any device) will give you a link rate of 150Mbit and 75Mbit throughput.

What WIFI receiver (device) are you using?

802.11n broadcom

 

[kanewolf]

The images you linked has nothing to do with WIFI. That is cable modem data.

Single stream 2.4Ghz N WIFI (which you should be able to support with any device) will give you a link rate of 150Mbit and 75Mbit throughput.

What WIFI receiver (device) are you using?

802.11n broadcom

Is it a laptop, or a USB desktop adapter, or desktop PCI adapter, etc? And what MODEL?

 

[cloudie503]

The images you linked has nothing to do with WIFI. That is cable modem data.

Single stream 2.4Ghz N WIFI (which you should be able to support with any device) will give you a link rate of 150Mbit and 75Mbit throughput.

What WIFI receiver (device) are you using?

802.11n broadcom

Is it a laptop, or a USB desktop adapter, or desktop PCI adapter, etc? And what MODEL?

this is a laptop toshiba sattilit c5421 not ub adapter

 

[BFG-9000]

Toshiba lists Broadcom, Intel or Realtek adapters for that model so you'd have to look by serial number or just look in Device Manager for what driver it's using as it's working.

For example if your B/G/N card is the Realtek RTL8188, that's only a single-stream 2.4GHz-only device so you should not expect more throughput than that, at 20MHz wide. If it's in a mini-PCIe slot then you could swap it out for a more modern AC one, seeing as you have an AC router.

The reason you only see 95Mbps wired is because your extremely low-end laptop only has 10/100 ethernet, not gigabit.

 

[cloudie503]

I bought a ac usb adapter and was only able to get 70mbps on 2.4ghz however i did get 289 on 5ghz. Being about 20 ft from the router my speeds cut in half. Im confused. It seems theres no way to get 200mbps wirelessly? makes me wonder why im paying for it then lol

Toshiba lists Broadcom, Intel or Realtek adapters for that model so you'd have to look by serial number or just look in Device Manager for what driver it's using as it's working.

For example if your B/G/N card is the Realtek RTL8188, that's only a single-stream 2.4GHz-only device so you should not expect more throughput than that, at 20MHz wide. If it's in a mini-PCIe slot then you could swap it out for a more modern AC one, seeing as you have an AC router.

The reason you only see 95Mbps wired is because your extremely low-end laptop only has 10/100 ethernet, not gigabit.

 

[BFG-9000]

The problem with 5GHz is signal strength: 5/6 64-QAM Wireless-N requires a minimum -64dB signal for maximum data rate at 20MHz, dropping to -61dB for 40MHz. 3/4 256-QAM Wireless-AC requires -59dB at 20MHz, -56dB at 40MHz, -52dB at 80MHz, and -48dB at 160MHz so you can see it's only good for a very short distance before it drops to 64-QAM and throughput drops 33%. In fact Wave 2 160MHz needs -62dB, and 80MHz needs -64dB or they will drop all the way to 16-QAM (which is around the signal strength needed to operate 40MHz N at full speed!). So basically at any reasonable distance AC is pretty much just N at 80MHz or 160MHz wide. It makes for pretty marketing numbers on the box though.

The workaround for this is to have a 5GHz AP in every room. That way you are never 20' away from one.

 

[cloudie503]

Dang that sucks. Thinking about downgrading back to 100 mbps or even 50 then since non of the laptops in the house are even getting 100mbps on 2.4ghz. I guess my problem is that non of the laptops i have ac 5ghz and only n so i dont want to go buy adapters for everyone of them. I understand that not alot of ppl are on the 5ghz channel but i wouldnt think it would be such a big speed difference from 5ghz to 2.4ghz.

The problem with 5GHz is signal strength: 5/6 64-QAM Wireless-N requires a minimum -64dB signal for maximum data rate at 20MHz, dropping to -61dB for 40MHz. 3/4 256-QAM Wireless-AC requires -59dB at 20MHz, -56dB at 40MHz, -52dB at 80MHz, and -48dB at 160MHz so you can see it's only good for a very short distance before it drops to 64-QAM and throughput drops 33%. In fact Wave 2 160MHz needs -62dB, and 80MHz needs -64dB or they will drop all the way to 16-QAM (which is around the signal strength needed to operate 40MHz N at full speed!). So basically at any reasonable distance AC is pretty much just N at 80MHz or 160MHz wide. It makes for pretty marketing numbers on the box though.

The workaround for this is to have a 5GHz AP in every room. That way you are never 20' away from one.