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Contributor I
Posts: 64
Registered: ‎06-07-2014

what does '3 x 3 multiple-input multiple-output (MIMO) with two spatial streams' means??

Hello, I jus came accross cisco aironet 1600 series AP and in its tech spec saw ' 3 x 3 multiple-input multiple-output (MIMO) with two spatial streams'.

 

3*3 means there are three receiving antenna's and 3 transmitting antenna's right? so how can it only form two spatial stream???? please help it is confusing me!!

 

which is the equivalent Aruba product here? will it be 105 which is 2*2 or 115 which is 3*3 or we should place external antenna based models(e.g ap104) as this cisco product has external antenna?

Guru Elite
Posts: 8,456
Registered: ‎09-08-2010

Re: what does '3 x 3 multiple-input multiple-output (MIMO) with two spatial streams' means??

Both the AP-22x or the AP-21x are 3x3

Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Contributor I
Posts: 64
Registered: ‎06-07-2014

Re: what does '3 x 3 multiple-input multiple-output (MIMO) with two spatial streams' means??

thanks for your reply...this cisco ap can form 2 spatial strems, but however are 3*3 mimo....i think it is somekind of fancy thing cisco is advertising but in reality it is 2*2.....still i m not sure what it is...

MVP
Posts: 4,269
Registered: ‎07-20-2011

Re: what does '3 x 3 multiple-input multiple-output (MIMO) with two spatial streams' means??

http://www.cwnp.com/first-certification-3x33/
Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
MVP
Posts: 1,310
Registered: ‎11-07-2008

Re: what does '3 x 3 multiple-input multiple-output (MIMO) with two spatial streams' means??

To OP, you can have three available antennas for Rx/Tx but only two are actually used. So the net:net is that when compared to a 3x3:3stream AP, a 3x3:2stream can use all three atnennas to pick the best two, but only use two for Tx/Rx. it will then have 1.5dB less for MRC, TxBF, etc. 

 

Jerrod Howard
Sr. Techical Marketing Engineer
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