Hi Marcio,
As it was pointed before, it is not a good idea to put 200 clients on a single AP. The end user experience would be horrible. Although I have seen an MR53 with more than 120 clients at the same time, I would strongly recommend you to use at least three APs to share this user load. The reason is not only the AP itself, is also about using different channels on each of them, which makes it easier to every end device (STA) to content for medium.
In wireless, before any transmission is made, every STA and AP needs to go through the process of CSMA/CA, which takes a lot of time itself, and the more devices, there are more chances of collisions, therefore retries, which roughly translates to slowness. Even with a mechanism like RTS/CTS, collisions cannot be completely avoided.
Additionally, I would suggest setting the minimum bitrate to a value of at least 11 Mbps (though I would personally recommend 12).
Depending on the environment itself, you may want to use directional antennas instead of Omnidirectional antennas, basically to have cells where you will serve the users (it really depends where you're planning where to deploy the APs)
Also, for Pedro, while there is no mechanism to limit the devices that can be associated with an AP, you can limit it by:
- Limit the signal spread (by using directional antennas)
- Increase the minimum bitrate (it will also effectively limit the cell size)
- Enable client balancing (https://documentation.meraki.com/MR/Other_Topics/Client_Balancing)
Also, we have a really good guide for deploying APs in High Density (HD) environments:
https://documentation.meraki.com/MR/Deployment_Guides/High_Density_Wi-Fi_Deployment_Guide_(CVD)
Hope it helps 
@Wireless wrote:Dears,
Which Meraki AP that can to support to 200 clients?
Thanks in advanced,
Marcio - Hx Brasil
Marcio
As your question stands it reads a bit like asking "how long is a piece of string?"
The only honest answer is "it depends".
In order to give you a useful answer, we need to know the answers to some specific questions
- what will the 200 STA (client devices (or hosts)) be doing (emails, watching videos, social media)
- will the users be mobile
- will the use of the WIFI connection be "bursty"
- what area (square metres) has to be covered
- what is the capacity of the uplink (to the internet)
- is coverage required for the 5 GHz band only or is the 2.4 GHz band also required
- will there be a need for providing a service to old specification equipment (IEEE 802.11b/g)
- what other WiFi networks are there in the vicinity and what are their specifications
- are their any practical reasons why several APs cannot be deployed
- are there marine aviation or weather radar activities/installations in the vicinity
Generally speaking I would point out
- there are more non-interfering 5 GHz channels than there are 2.4 GHz channels (only 3 do not overlap other channels)
- effectively 5 GHz WiFi has have half the range of 2.4 GHz WiFi at similar TX levels (so less incidence of channel interference)
- it is better to have more low powered (and cheaper) APs operating at medium TX levels than fewer higher powered devices operating at maximum volume
- for a functioning link between an AP and a client device, the AP needs to be able to hear the client device as well as the client device hearing the AP. Turning up the TX volume only makes matters worse
With some information to go on, then it is possible that useful advice may be proferred. Without it, nothing of value.
So please give us some background.
@uberseehandel
Answer - Who knows?
Why - we don't know what the users will be doing.
We need to know what the users will be doing and how bursty the usage will be.
@uberseehandel
