Wireless Access

Reply
fmo
Contributor I

RF Range for different APs

Hello guys!

 

I cannot seem to find in the documentation the RF ranges for Aruba APs. What's the typical range for the following APs when they are operating in the default power values?

 

AP 135

AP 105

AP 93 

AP RAP-3NWP

 

Regards,

fmo

Re: RF Range for different APs

This is a tricky one as ARM will automatically tune the power based on the RF environment plus the attenuating materials in your install.  Have you used RF Plan for a predictive site survey?

Seth R. Fiermonti
Consulting Systems Engineer - ACCX, ACDX, ACMX
Email: seth@hpe.com
-----
If you found my post helpful, please give kudos
fmo
Contributor I

Re: RF Range for different APs

SethFiermonti,

 

No survey was done before hand. The Customer asked us to demonstrate how the APs and Contoller works and gave us a day's notice. So we just configured the appliances and had them delivered to them. Am aware of the wall material issue, but am looking at an Expo Center which is basically open (few walls).

 

could we have a theoritical value considering that the building is like a wharehouse with no walls inbetween? Or that will be too theoritical?

 

Regards,

fmo

Re: RF Range for different APs

There is a great VRD for RF planning located here:

 

http://www.arubanetworks.com/wp-content/uploads/Indoor80211n_2012-05-31.pdf

 

In there, please note the considerations of the deployment model you wish to deploy.  There are things like client density, signal strength requirements, transmit power of the client NIC, etc... It's not just about how far an AP can reach...it's also about the AP hearing the return traffic from the client.  

 

So...here's an excerpt which may help:

 

...since approximately 2008, most new enterprise wireless LANs have been deployed using a “capacity model” approach. In this case, we use many more APs because our concern is ensuring that a minimum speed is available throughout the coverage area.

Today, data and voice designs use a capacity approach. The primary difference between them is the choice of minimum data rate. Data-only deployments have less rigorous needs than voice deployments. For a full explanation of the data rates available see the Aruba 802.11n Networks VRD.

 

Capacity Model (High Bandwidth)


The capacity model is for dense deployments with high device counts and traffic rates. A capacity-based deployment might consist of APs placed roughly 45 to 60 feet (approx. 13.75 to 18.25 meters) apart running at 25-50% or 50-75% of power. In general, the transmit power of the AP should be set to match that of the least-capable device in the network. If the requirement is a “desk-top like” experience for employee laptops, where the employee can run multiple applications simultaneously, the site requires a capacity-based deployment. Aruba recommends capacity-based deployment for all office and education settings.

 

Coverage Model (Low Bandwidth)

 

The coverage model is for low-bandwidth deployments, coverage is required for applications such as a scanner solution or limited guest access. A coverage-based deployment might consist of APs placed roughly 70 to as much as 200 feet (approx. 30.5 to 61 meters) apart in an open space, running at 50-75% of power. If redundancy is not required, APs can run at 100% power, but this typically is not recommended. As an example, if the determined application is a scanning solution with minimal traffic, the site might be a good candidate for a coverage-based model. This deployment would consist of an AP installation base with clients that associate at greater distances and at lower traffic rates. This coverage model would mandate a ceiling deployment.

 

Aruba no longer recommends coverage-based deployments as networks that had very few clients previously are now seeing new services deployed.

Seth R. Fiermonti
Consulting Systems Engineer - ACCX, ACDX, ACMX
Email: seth@hpe.com
-----
If you found my post helpful, please give kudos
fmo
Contributor I

Re: RF Range for different APs

Seth, Thank you.

 

Since the recommended model is the capacity Model, that means that the coverage is around 18m at Most (unless otherwise tested). That gives each AP an approximate radius coverage of only 9m :(...Sad!

Re: RF Range for different APs

These are just recommendations and also note the transmit power percentages.  That is for coverage hole detection should an AP fail.  Also, you are more open that a typical office environment.  I would run an RF plan to see...there are capacity modelings you can do with the tool.

Seth R. Fiermonti
Consulting Systems Engineer - ACCX, ACDX, ACMX
Email: seth@hpe.com
-----
If you found my post helpful, please give kudos
Search Airheads
cancel
Showing results for 
Search instead for 
Did you mean: