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are my presumptions correct?

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jraju:
Hi, I have a dlink 2730u indian model wifi modem router, that supports wifi and it is called N150 , meaning that its speed is 150mbps on wifi.
I get my wifi access thro the lan ethernet connection on wifi support devices.
My presumption:
1. ISP has bandwidth control on the broadband speed with the plan that I select.
2. The router has been connecting the wifi devices  on the access point provided in the  router.
3. Eventhough, the ISP provide access point via the ethernet connection by telephonic wire , he has no control over the wifi speed accessed  with my router.
4. I have a 2.4 ghz speed router, which supports minium speed , and If i change the router to a 5ghz speed router, then i could get more speed on my wifi devices, the dual wifi router would give better speed and area coverage.
5. The ISP has no say on the speed of the wifi and it is entirely controlled by the router wifi power.
Please say, what I have presumed are correct , point by point, so that i will buy a new router that supports 5ghz speed

Boggin:
5Ghz is only applicable to wireless and not Ethernet and your wireless adapter in your computer has to be 5GHz compatible -

https://checkmybroadbandspeed.online/2-4-ghz-vs-5-ghz-wireless-frequency/

In the UK the speed is determined by the package you are paying for and the length of wire from the exchange to your home when using ADSL but from the cabinet to your home when using Fibre.

This can be determined by dividing the Downstream Attenuation by 13.81 and will give the approx. answer in kms.

Are you using ADSL or Fibre ?

2.4GHz gives a longer range but at lower speeds than 5GHz but 5GHz has a shorter range.

https://www.centurylink.com/home/help/internet/wireless/which-frequency-should-you-use.html

jraju:
Hi, Boggins thanks for the reply.
I have seen the reply to day only, as I was awaiting reply.
though, I checked notifiy of replies, it has not reached my gmail.
Today, I thought of writing a reminder, when I saw your post.
thanks for the answer.
Boggin, I have a doubt.
Internet speed is given by my ISP and wireless speed is also shared from the internet and as such, controlled by the ISP.
Is it a facat, that if one has a plan of 12 mbps download speed internet plan, and if one uses devices such as mobile, laptop etc, the speed will be shared between the devices, or is it some other way of calculating the speed.
Is my presumption that every device on the network, say, in my case pc laptop mobile will get equal speed, say, 12 mbps, if they are just browsing the internet
If one device is downloading , then the speed will be the same, as in the downloading device.
I bought a n300 wifi router but having 2.4 ghz capacity in the Dlink company

jraju:
I also wish to state that my maximum broadband speed is the maximum bb speed plan, and i get 12 mbps as my house is about 2.5 k.ms of wire between dslam and my house.
My adsl router is having all dsl settings ticked, but I unchecked all below adsl to get the maximum speed.
when I select adsl, the router shows not as adsl but g992.5. in my new router dlink 2750u

Boggin:
The speed is shared between all switched on devices but a device that is downloading will take more bandwidth than one just browsing.

I've Googled for g992.5 but didn't get anything I could put my finger on.

See what you get when you Google it from your location.

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