Wireless Access

Hello i was reading the datasheet of this AP but i didnt understand this part completely

   2.4-GHz band: +28 dBm (23 dBm per chain)
­   5-GHz band: +25 dBm (20 dBm per chain)

What does this mean? 23 dBm per chain? but + 28dBm ? or in the 5ghz +25dbm but 20 per chain?

Anyone can explain me this? :)

Cheers

Carlos

802.11n is comprised of multiple Transmit (Tx) and Multiple Receive (Rx) "chains".  Commonly you see this abbreviated as 2x2  or 3x3.   

The first number in the specification sheet is the aggregate of all Tx chains, whereas the second number is 'per chain'.  

Note on the AP-115 we have the following information on the datasheet: 

"The AP-115 and IAP-115 APs feature a 2.4-GHz and a 5-GHz radio, each with 3x3:3 MIMO and three integrated omni-directional downtilt antennas."

So that  means 3 Tx chains for our AP-115.    

Most 802.11n products are specified in this methodology today   xx dBm per chain and yy dBm total/aggregate power in each band.

JF

so if it is only using one stream, or 'single chain legacy' is enabled, there is a higher power output?

If you have devices with only 1 spatial stream (SS), then the additional streams in APs will serve no purpose meaning, you should be able to get similar throughput on this device between a 2 SS and 3 SS AP.  

Having said that, the 115 was designed for great coverage and includes cellular interference mitigation in the hardware.  It's a great AP!

Anyone know how an AP-115 compares to an AP-135 performance-wise?  Both are 3x3:3.

The specs are similar but I know some designs are optimized for low vs. high-client density.

Thanks!

AP-110 series is designed for lower density deployments than the AP-130 series.

The idea is to provide you an option for 3 stream (450 Mbps max) 802.11n at a lower price point than the traditional AP-135.

I would use them in medium density areas, low density areas (hallways, primary school classrooms, warehouses etc). where you want 3 stream 802.11n and continue to use AP-135 or AP-225 in high density areas (lecture theatres, cafeteria, large conference rooms)

A great addition to the Aruba AP product family to 'mix-in' as needed. 

JF

Thanks JF!

Hello Jfernyc

Do you know if the ap 115 will reach full on 5ghz to the ground when the ap 115 is facing down in the ceiling which has a heigh of 10m?

How much it will cover on the ground horizontally? on the 5ghz band?

Cheers

Carlos

Thanks for the question.

The AP110 series was designed with the down-tilt style antenna approach that our other APs have.

That being the case, coverage from high ceilings (10m/30ft) is very good.       

JF

What would be the coverage on the ground ?

I mean horizontally knowing the heigh is 10m? Is there a way to calculate it?

i mean a way to know less or more how many APS i need in a single row? i mean im talking about a warehouse.

Cheers

Carlos